Northern Network Card UTA220 UTA220k User Manual
UTA220/UTA220k Terminal Adapter  
User Guide  
Motorola ING, Inc.  
Part No. T0123 A  
August 1998  
© 1998 Motorola  
20 Cabot Blvd  
Mansfield, MA 02048-1193  
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FCC REQUIREMENTS  
WARNING  
This equipment uses, generates, and can radiate radio  
frequency energy interfering with radio communications  
if not installed and used according to the instruction  
manual. It has been tested and complies with the limits for  
a Class A computing device according to FCC Rules, Part  
15. Operation of this equipment in a residential area may  
cause interference. If it does, you must correct the cause  
of the interference.  
Changes or modifications to this unit not expressly  
approved by the party responsible for compliance could  
void the user’s authority to operate this equipment.  
SHIELDED CABLES  
Shielded DTE cables should be used with this unit to  
ensure compliance with Class A limits.  
SPECIAL REQUIREMENTS FOR CANADA  
Certain requirements exist for data communication products manufactured for use in  
Canada. Principle among these requirements is the application of the IC stamp as described  
below. However, certain data communication products do not require the IC stamp nor  
adherence to IC requirements. If this is the case the IC stamp will not be affixed to the rear  
panel of standalone units nor packaged with units designed for insertion in user equipment.  
Industry Canada (IC) Requirements  
IC stamps are affixed to the rear of each standalone unit sold in Canada. Card units which  
are installed in the user’s equipment are shipped with a stamp included. The user should  
place the stamp on the outside of his equipment as close as possible to the telephone line  
connector. This stamp has the certification number for that particular unit. The numbers  
are different for each model.  
The Industry Canada label identifies certified equipment. This certification means that the  
equipment meets certain telecommunications network protective, operational, and safety  
requirements. IC does not guarantee the equipment will operate to the user’s satisfaction.  
Before installing this equipment, users should ensure that it is permissible to be connected  
to the facilities of the local telecommunications company. The equipment must also be  
installed using an acceptable method of connection. In some cases, the company’s inside  
wiring associated with a single line individual service may be extended by means of a  
certified connector assembly (telephone extension cord). The customer should be aware  
that compliance with the above conditions may not prevent degradation of service in some  
situations.  
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Repairs to certified equipment should be made by an authorized Canadian maintenance  
facility designated by the supplier. Any repairs or alterations made by the user to this  
equipment, or equipment malfunctions, may give the telecommunications company cause  
to request the user to disconnect the equipment. For their own protection users should ensure  
that the electrical ground connections of the power utility, telephone lines and internal  
metallic water pipe system, if present, are connected together. This precaution may be  
particularly important in rural areas.  
CAUTION  
Users should not attempt to make installation connections  
themselves, but should contact the appropriate electric  
inspection authority or electrician.  
Load Number  
The Load Number (LN) assigned to each terminal device denotes the percentage of the total  
load to be connected to a telephone loop which is used by the device, to prevent overloading.  
The termination on a loop may consist of any combination of devices subject only to the  
requirement that the total of the Load Numbers of all the devices does not exceed 100.  
Canadian Emission Requirements  
This digital apparatus does not exceed the Class A limits for radio noise emissions from  
digital apparatus set out in the Radio Interference Regulations of the Industry Canada (IC).  
Le présent appareil numérique n'emet pas de bruits radioélectriques dépassant les limites  
applicables aux appareils numériques de la class A prescriptes dans le Règlement sur le  
brouillage radioélectrique édicté par Industrie et Canada.  
iv  
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Preface  
PREFACE AND STATEMENT OF APPLICATION  
This manual is written for users of the UDS UTA220/UTA220k terminal adapter. Please  
read the appropriate chapters before installing, changing any option, or operating the unit.  
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Preface  
vi  
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Contents  
Motorola Information Systems Group Customer Information  
Chapter 1. Introduction  
FEATURES ..............................................................................................................  
Compatibility .......................................................................................................  
Other Features ......................................................................................................  
OPERATION ............................................................................................................  
PHYSICAL DESCRIPTION ....................................................................................  
LED Description ..................................................................................................  
FUNCTIONAL ........................................................................................................  
1-1  
1-1  
1-1  
1-2  
1-2  
1-4  
1-4  
Chapter 2. Installation  
RECEIPT INSPECTION ..........................................................................................  
SITE PREPARATION ..............................................................................................  
INSTALLATION ......................................................................................................  
Power Connection ................................................................................................  
ISDN Connection ................................................................................................  
DTE Connection .......................................................................................................  
DTE INTERFACE SPECIFICATIONS ...................................................................  
2-1  
2-1  
2-2  
2-2  
2-2  
2-3  
2-3  
Chapter 3. Getting Started  
SWITCHES AND STRAPS .....................................................................................  
Cover Removal ....................................................................................................  
SWITCH AND STRAP SETTINGS.........................................................................  
Signal Ground ......................................................................................................  
V.35/EIA-232 Interface .......................................................................................  
Interface Card Removal ......................................................................................  
DIP Switch Options .............................................................................................  
CENTRAL OFFICE SWITCH ................................................................................  
SETUP.......................................................................................................................  
3-1  
3-1  
3-2  
3-2  
3-3  
3-4  
3-5  
3-6  
3-6  
Chapter 4. ISDN  
ISDN BASICS ..........................................................................................................  
ISDN Standards....................................................................................................  
National ISDN......................................................................................................  
Basic Rate Interface .............................................................................................  
Terminal Adapters ...............................................................................................  
ISDN Basic Rate Interface Points ........................................................................  
ISDN Service .......................................................................................................  
ISDN SWITCHES ...............................................................................................  
ISDN ADDRESSES AND IDENTIFIERS .........................................................  
ISDN CHANNELS .............................................................................................  
B-Channel Data Service ......................................................................................  
B-Channel Data Protocols....................................................................................  
D-Channel Signaling Protocols ...........................................................................  
Layer One.............................................................................................................  
Layer Two.............................................................................................................  
Layer Three .........................................................................................................  
4-1  
4-1  
4-1  
4-2  
4-2  
4-2  
4-3  
4-3  
4-5  
4-6  
4-6  
4-7  
4-7  
4-7  
4-8  
4-8  
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Contents (continued)  
Chapter 5. LCD Operation  
LCD MENUS ...........................................................................................................  
Main Menus .........................................................................................................  
Submenus ............................................................................................................  
LCD OPERATION ...................................................................................................  
Menu Traversal.....................................................................................................  
5-1  
5-1  
5-1  
5-1  
5-1  
Chapter 6. V.25 bis Dialer Operation  
SELECTING V.25bis ..........................................................................................  
OPERATION IN V.25 bis MODE.............................................................................  
V.25 bis MESSAGE FRAMES .................................................................................  
DTE INTERFACE PINS ..........................................................................................  
DTR Pin Operation...............................................................................................  
DCD Pin Operation .............................................................................................  
CTS Pin Operation ..............................................................................................  
DSR Pin Operation ..............................................................................................  
COMMAND PROCEDURES ..................................................................................  
COMMANDS ...........................................................................................................  
Dial Command: CRN xx..x ................................................................................  
Connect Incoming Calls: CIC .............................................................................  
INDICATION MESSAGES .....................................................................................  
Call Connect Indication: CNX ............................................................................  
Incoming Call Indication: INC ............................................................................  
Response Messages .............................................................................................  
6-1  
6-1  
6-1  
6-2  
6-2  
6-2  
6-3  
6-3  
6-3  
6-3  
6-3  
6-4  
6-4  
6-4  
6-5  
6-5  
Chapter 7. EIA-366 Dialer Operation  
CONFIGURATION .................................................................................................  
OPERATION ............................................................................................................  
INTERFACE SIGNAL DEFINITIONS ...................................................................  
Power Indication (PWI) .......................................................................................  
Call Request (CRQ) .............................................................................................  
Data Line Occupied (DLO) .................................................................................  
Distant Station Connected (DSC).........................................................................  
Digit Signal Circuits (NB1-NB8).........................................................................  
Digit Present (DPR)..............................................................................................  
Present Next Digit (PND) ....................................................................................  
Abandon Call and Retry (ACR) ..........................................................................  
EXAMPLE DIAL SEQUENCE................................................................................  
7-1  
7-1  
7-2  
7-2  
7-2  
7-2  
7-2  
7-2  
7-3  
7-3  
7-4  
7-4  
Chapter 8. AT Command Operation  
AT COMMAND STATEMENT ...............................................................................  
AT Command Mode .............................................................................................  
ESCAPE SEQUENCE: + + + .............................................................................  
CREATING A COMMAND STATEMENT: AT .................................................  
COMMAND STATEMENT GUIDELINES .......................................................  
MONITOR DISPLAY..........................................................................................  
DTE CHARACTER ECHO: E ............................................................................  
COMMAND STATEMENT BUFFER ................................................................  
8-1  
8-1  
8-1  
8-2  
8-2  
8-2  
8-2  
8-2  
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Contents (continued)  
Chapter 8. AT Command Operation (Continued)  
BACKSPACE KEY ..................................................................................................  
REPEATING A COMMAND: A/ .......................................................................  
NUMBERED COMMANDS ...................................................................................  
GROUP COMMANDS .......................................................................................  
COMMAND SCOPE ...........................................................................................  
Supervisor Command Mode ................................................................................  
8-3  
8-3  
8-3  
8-3  
8-4  
8-4  
Chapter 9. Rate Adaption  
RATE ADAPTION ...................................................................................................  
T-LINK......................................................................................................................  
Flow Control and Pin Options .............................................................................  
T-Link Options ....................................................................................................  
V.120.....................................................................................................................  
V.120 Options ......................................................................................................  
9-1  
9-1  
9-2  
9-2  
9-3  
9-3  
Chapter 10. BONDING  
BONDING ON THE UTA220 .................................................................................  
PLACING A BONDING CALL ..............................................................................  
DISCONNECTING A BONDING CALL ...............................................................  
10-1  
10-2  
10-2  
Chapter 11. Synchronous Operation  
SYNCHRONOUS MODES .....................................................................................  
Synchronous Mode 1: Sync Pause Mode ............................................................  
Synchronous Mode 2: Dial Stored Number Mode ..............................................  
11-1  
11-1  
11-1  
Chapter 12. D-Channel X.25  
FUNCTIONAL DESCRIPTION ..............................................................................  
X.25 .....................................................................................................................  
PAD .....................................................................................................................  
ESTABLISHING AN X.25 SESSION .....................................................................  
Initialize the PAD .................................................................................................  
ATDD Command..................................................................................................  
AT@P1=P or AT@P1=D Command ...................................................................  
Establishing an X.25 Virtual Connection ............................................................  
Escaping to PAD Command Mode ......................................................................  
Escaping to AT Command Mode .........................................................................  
Disconnecting the X.25 Virtual Connection ........................................................  
COMMON APPARENT PROBLEMS ....................................................................  
Parameter 1 Changed ...........................................................................................  
Parameter 2 Changed ...........................................................................................  
Parameter 5 Changed ...........................................................................................  
Parameter 6 Changed ...........................................................................................  
Parameter 20 Changed..........................................................................................  
PAD COMMAND SET ............................................................................................  
PAD Command Format .......................................................................................  
12-1  
12-1  
12-1  
12-2  
12-2  
12-2  
12-2  
12-3  
12-4  
12-4  
12-4  
12-5  
12-5  
12-5  
12-5  
12-5  
12-5  
12-5  
12-5  
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Contents (continued)  
Chapter 12. D-Channel X.25 (Continued)  
Issuing PAD Commands ......................................................................................  
Status: STAT.........................................................................................................  
Clear: CLR ...........................................................................................................  
RESET .................................................................................................................  
Interrupt: INT .......................................................................................................  
SET.......................................................................................................................  
Read: PAR? ..........................................................................................................  
Set and Read: SET? .............................................................................................  
Remote Read: RPAR? .........................................................................................  
Remote Set and Read: RSET? .............................................................................  
Profile Read/Save: PROF ....................................................................................  
PAD Select ...........................................................................................................  
FACILITIES .............................................................................................................  
Reverse Charging: R ............................................................................................  
Network User Identification (NUI) .....................................................................  
Closed User Group (CUG) ..................................................................................  
Recognized Private Operating Agency ...............................................................  
Flow Control Parameter Negotiation ...................................................................  
PAD SERVICE SIGNALS .......................................................................................  
PAD Reset Service Signals ..................................................................................  
Pad Clear Service Signals ....................................................................................  
X.3 PARAMETERS AND VALUES .......................................................................  
Saving the X.3 Parameter Configuration .............................................................  
Parameter 1: Pad Recall Character ......................................................................  
Parameter 2: Echo ................................................................................................  
Parameter 3: Selection of Data Forwarding Characters ......................................  
Parameter 4: Selection of Idle Timer Delay .......................................................  
Parameter 5: Ancillary Device Control...............................................................  
Parameter 6: Control of PAD Service Signals .....................................................  
Parameter 7: Action of PAD on Break from DTE ..............................................  
Parameter 8: Discard Output ..............................................................................  
Parameter 9: Padding after Carriage Return........................................................  
Parameter 10: Line Folding..................................................................................  
Parameter 11: Binary Speed of Local DTE .......................................................  
Parameter 12: Flow Control of PAD by Local DTE ..........................................  
Parameter 13: Line Feed Insertion after Carriage Return ...................................  
Parameter 14: Padding after Line Feed ..............................................................  
Parameter 15: Editing..........................................................................................  
Parameter 16: Character Delete ..........................................................................  
Parameter 17: Line Delete....................................................................................  
Parameter 18: Line Display..................................................................................  
Parameter 19: Editing PAD Service Signals .......................................................  
Parameter 20: Echo Mask ....................................................................................  
Parameter 21: Parity Treatment ...........................................................................  
Parameter 22: Page Wait .....................................................................................  
12-6  
12-6  
12-6  
12-6  
12-7  
12-7  
12-8  
12-8  
12-8  
12-9  
12-9  
12-10  
12-11  
12-11  
12-11  
12-11  
12-12  
12-12  
12-14  
12-15  
12-15  
12-16  
12-16  
12-19  
12-20  
12-20  
12-21  
12-22  
12-22  
12-23  
12-24  
12-24  
12-25  
12-25  
12-26  
12-26  
12-27  
12-28  
12-28  
12-29  
12-30  
12-31  
12-32  
12-32  
12-33  
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Contents (continued)  
Chapter 13. Softload  
TA SOFTWARE ARCHITECTURE ........................................................................  
Software Sets .......................................................................................................  
Software Format ..................................................................................................  
TA Power-Up Sequence ......................................................................................  
SOFTLOAD OPERATION ......................................................................................  
Set/Display Softload Password: %P1 ..................................................................  
Request Softload Product Version Information: $Q ............................................  
Initiate Software Download: $Y=x .....................................................................  
Copy Active Flash: $Y2=x .................................................................................  
S59 SOFTLOAD .................................................................................................  
Swap to Alternate Software: $T=x ......................................................................  
TYPICAL LOCAL SOFTLOAD SESSION ............................................................  
13-1  
13-1  
13-1  
13-2  
13-3  
13-3  
13-4  
13-5  
13-6  
13-6  
13-8  
13-8  
Chapter 14. Diagnostics  
COMMUNICATION DIAGNOSTICS ....................................................................  
GLOBAL TESTS .....................................................................................................  
2B+D Loopback ...................................................................................................  
PORT TESTS ......................................................................................................  
Local Terminal Loopback ....................................................................................  
Local Loopback Test ...........................................................................................  
Digital Loopback Test .........................................................................................  
Bilateral Loopback Test .......................................................................................  
DIAGNOSTIC STATUS DISPLAY .........................................................................  
Front Panel Keypad Test .....................................................................................  
View Product Information ...................................................................................  
View Diagnostic Code .........................................................................................  
14-1  
14-1  
14-1  
14-2  
14-2  
14-2  
14-3  
14-5  
14-6  
14-6  
14-6  
14-6  
Chapter 15. Maintenance  
FUSE ........................................................................................................................  
MAINTENANCE......................................................................................................  
15-1  
15-1  
Appendix A. Specifications  
ISDN Line Type ..................................................................................................  
Connection Types ...............................................................................................  
DTE Data Rates ...................................................................................................  
DCE Data Rates ...................................................................................................  
Data Rate Adaption Protocols .............................................................................  
DTE Available Interfaces ....................................................................................  
Switch Compatibility............................................................................................  
Supplementary Services .......................................................................................  
Dimensions ..........................................................................................................  
Environmental .....................................................................................................  
Power Requirements ............................................................................................  
Power Consumption ............................................................................................  
A-1  
A-1  
A-1  
A-1  
A-1  
A-1  
A-1  
A-2  
A-2  
A-2  
A-2  
A-2  
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Contents (continued)  
Appendix B. Factory Default Settings  
Appendix C. AT Command Set  
Appendix D. Interfaces  
ISDN INTERFACE ..................................................................................................  
INTERFACES ..........................................................................................................  
EIA-366A Requirements ..........................................................................................  
DTE INTERFACE PIN DESCRIPTIONS ...............................................................  
Transmit Data ......................................................................................................  
Receive Data ........................................................................................................  
Request to Send....................................................................................................  
Clear to Send .......................................................................................................  
Data Set Ready ....................................................................................................  
Signal Ground ......................................................................................................  
Data Carrier Detect ..............................................................................................  
Transmit Clock ....................................................................................................  
Receive Clock ......................................................................................................  
Data Terminal Ready ...........................................................................................  
Ring Indicator ......................................................................................................  
D-1  
D-1  
D-5  
D-6  
D-6  
D-6  
D-6  
D-6  
D-6  
D-6  
D-6  
D-6  
D-7  
D-7  
D-7  
Appendix E. Network Option Values  
Appendix F. ASCII and EBCDIC Characters  
Appendix G. Abbreviations and Acronyms  
Appendix H. Status and Connection Messages  
Appendix I. 128K Clear Channel Leased-Line Service  
Configuring D- and B-Channels ...............................................................................  
Configuring the Port and Protocol ............................................................................  
I-1  
I-2  
Return Procedures  
Index  
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Motorola Information Systems Group  
Customer Information  
Introduction  
U.S.A. customers who have questions about Motorola Information Systems Group  
(ISG) products or services should refer to the following sections. Non-U.S.A.  
customers should contact their local Motorola Information Systems Group  
subsidiary office or distributor. For a listing of our Sales and Service Offices, visit  
our Web site at:  
http://www.mot.com/MIMS/ISG/.  
For Questions  
About Your  
If you have questions about whether your shipment is complete or about its condition  
upon receipt, please call your nearest Motorola Information Systems Group  
Product Shipment representative, or Customer Administration at (508) 261-4000, Extension 4745.  
For Technical  
Assistance or to  
Schedule Service  
Call your local Salesperson to request that a Network Services Specialist work with  
you to develop an implementation and/or staging quote.  
For service, if your unit is under warranty and/or you have a service contract:  
Call (800) 544-0062 for assistance. When you call for assistance, please have the  
unit’s Model Number and Serial Number ready.  
If you do not have a service contract, and your unit is no longer under warranty:  
You can purchase a service contract or arrange for Time and Material services by  
calling (800) 544-0062 for assistance.  
To Access the  
Motorola ISG  
Additional company and product information can be found on our Internet Web page  
at:  
Internet Web Pages  
http://www.mot.com/MIMS/ISG/  
For Sales-Related Please call your local Motorola Information Systems Group sales office, authorized  
Issues  
distributor, or the Sales Assistance Center at (800) 446-0144. For a listing of our  
sales offices, visit our Web site at:  
http://www.mot.com/MIMS/ISG/.  
For Information on For information on classroom training, customized on-site training, or to order self-  
Product Training  
study training materials, call the Sales Assistance Center at (800) 446-0144.  
For Questions  
About Billing  
If you have a question regarding billing, call 1-800-446-0144 and select option 2.  
For Comments  
To help us improve our product documentation, please complete and return by mail,  
About the Manual or fax to (508) 339-6814, the prepaid comment card at the end of this guide. If you  
prefer, simply include your name, company, and telephone number and someone in  
the documentation group will contact you to discuss any comments you might have.  
Motorola Information Systems Group Customer Information  
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To Order Additional If you would like to order additional copies of Motorola Information Systems Group  
Motorola ISG User user documentation, call (508) 261-5933.  
Documentation  
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Motorola would like your help in improving its product documentation. Please complete and return this  
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To discuss comments with a member of the Motorola documentation group, provide telephone  
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Introduction  
Chapter 1  
Introduction  
The Motorola UTA220 terminal adapter connects existing  
Data Terminal Equipment (DTE) to the Integrated Services  
Digital Network (ISDN). The UTA220 uses the ISDN Basic  
Rate Interface which consists of two bearer (B) channels for  
data and one delta (D) channel for signaling.  
The UTA220 has two DTE port connectors. In addition, the  
UTA220 can be ordered with two additional DTE port  
connectors for EIA-232 asynchronous use or EIA-366  
dialing. Each DTE has access to the 56 kbps/64 kbps ISDN B  
channels. The UTA220 functions similarly to two standard  
modems in this mode.  
FEATURES  
The UTA220 allows maximum freedom in designing a  
communications network. The UTA220 includes the  
following features:  
Compatibility  
• Compatible with Northern Telecom DMS100 ISDN central  
officeswitchesrunningsoftwareversionsBCS-29andabove  
• Compatible with AT&T 5ESS ISDN central office switches  
running generic programs 5E4.2 or above for TYPE A  
terminals  
•Compatiblewith centraloffice switchesrunning the signaling  
standard National ISDN 1 (NI1)  
Note: The UTA220 does not support electronic key telephone  
service (EKTS) or supplementary data services.  
Other Features  
• LCD option selection and operation control  
• Nonvolatile storage of 10 dial strings per port  
• Two sets of operating configurations saved in nonvolatile  
memory  
• 56 kbps/64 kbps synchronous operation  
• 112 kbps/128 kbps synchronous operation using the  
BONDING protocol  
• V.25 bis HDLC or BISYNC call control  
• EIA-366 call control on the optional upper ports  
• Optionalfront panelUTA220numerickeypadfor dialing and  
entering options  
• Integral autodialing with AT command set  
UTA220/UTA220k  
1-1  
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Introduction  
OPERATION  
Nonvolatile memory holds two sets of user defined operating  
configurations. Options and functions are selected from the  
front panel or by AT commands. A menu driven 32-character  
liquid crystal display (LCD) provides command feedback as  
well as real time displays. UTA220 operation is monitored by  
six light emitting diodes (LEDs) on the front panel.  
The UTA220 and UTA220 have four methods of operation.  
• The UTA220 is programmed from the front panel using three  
push buttons, YES, NO, and HOME. The UTA220 has a  
numeric keypad that includes the additional function keys;  
CALL / HANGUP and ENTER;  
• V.25 bis dialer functions and AT commands are performed  
on the EIA-232 or V.35 interfaces.  
• EIA-366 dialer functions are performed on the optional upper  
ports.  
PHYSICAL DESCRIPTION  
The UTA220 is manufactured as a stand-alone desktop unit  
and as a rack-mount insert card. This manual applies to either  
unit. Figure 1-1 shows the front panel controls and indicators.  
Figure 1-1. Front Panel UTA220  
The standard UTA220 rear panel (Figure 1-2) houses two  
25-pinD-typeconnectorsfortheDTEinterface, an8-pinISDN  
Umodular connector(U interface), the ON/OFF toggle switch,  
line fuse, and power control. The UTA220 can be ordered with  
a V.35 interface, in which case adapters should be connected  
to the 25-pin D-type connectors (Figure 1-3).  
1-2  
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Introduction  
Caution: Connecting a V.35 DTE to a non-V.35 port may  
damage the DTE.  
Figure 1-2. Rear Panel EIA-232 Configuration  
Figure 1-3. V.35 Adaptor  
If the UTA220 is ordered with the additional upper ports, then  
the rear panel will also contain two additional 25-pin D-type  
connectors above the two lower DTE interface connectors  
(Figure 1-4).  
Figure 1-4. Four Port Rear Panel Configuration  
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Introduction  
LED Description  
The UTA220 has six LED indicators: B1, B2, D, DP, T, PW.  
The functions of these LEDs are as follows:  
B1 - On when the B1 channel has a call.  
B2 - On when the B2 channel has a call.  
D - This LED is for the D-Channel.  
• It is off when the U connection is not established.  
• It single blinks when the U connection is established.  
(This may take up to 15 seconds after connection is made.)  
• It double blinks when communications are established with  
the switch.  
• It is on when all B channels are available.  
DP - On when the D-Channel is available for packet  
calls.  
T (Test) - On during the following global tests:  
• 2B+D loopback  
• Switch initiated tests--quiet mode and insertion loss  
measurement  
PW - On when the UTA220 has power.  
FUNCTIONAL  
The UTA220 operates on the ISDN Basic Rate Interface (BRI)  
(2B+D). This interface provides two 64-kbps full-duplex  
bearer (B) channels for circuit switched lines. The Basic Rate  
Interface also provides a 16 kbps delta (D) channel for  
signaling messages. The UTA220 adapts any data terminal to  
the ISDN Basic Rate Interface for circuit-switched data.  
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Installation  
Chapter 2  
Installation  
Installation of the UTA220/UTA220k is simple and straight  
forward. Prior to installation, refer to Chapter 3 to either verify  
or change strap options.  
RECEIPT INSPECTION  
After unpacking the equipment, check the contents against the  
packing list. Inspect the equipment carefully for damage that  
may have occurred in shipment. If there is damage or material  
shortage, contact the shipping agent and Motorola for advice  
and assistance. Motorola suggests that the shipping container  
and packing material be retained for future shipment.  
SITE PREPARATION  
The installation area should be clean and free from extremes  
of temperature, humidity, appreciable shock, and vibration.  
Allow ample space at the rear of the UTA220 for cable  
clearance and air flow. Install the UTA220 within 6 feet of a  
115 or 230 VAC grounded outlet as required for the specific  
model and no farther than 50 feet from the DTE.  
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Installation  
INSTALLATION  
A typical installation is shown in Figure 2-1.  
Figure 2-1. Typical Installation  
Power Connection  
ISDN Connection  
2-2  
Insert the power plug into a grounded 115 or 220 VAC outlet  
as required for the specific model. The UTA220 is now ready  
to be turned on and programmed.  
Caution: Do not connect the UTA220 to the ISDN line until  
the UTA220 has been programmed with the correct switch  
settings. Refer to CentralOfficeSwitchinChapter3 for details.  
To connect the UTA220 to the ISDN line, insert one end of the  
supplied cable into the UTA220 ISDN U jack. Insert the other  
end into the ISDN (RJ45) jack.  
Note: An NT1 device is not required.  
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Installation  
DTE Connection  
Insert each DTE cable into a DTE connector. Insert the  
opposite end into the DTE. Secure the connect screws to  
complete the connection.  
DTE INTERFACE SPECIFICATIONS  
The DTE interface to the UTA220 is through an EIA-232  
D/E 25-pin D-type connector. The UTA220 can also be  
configured for V.35 operation. It is also available with V.35  
interfaces and with two additional ports for EIA-366 dialing,  
or EIA-232C operation.  
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Installation  
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Getting Started  
Chapter 3  
Getting Started  
This chapter provides instructions for setting switches and  
straps plus a quick programming setup for the DMS100 or the  
5ESS central office switch or switches running National ISDN  
1 (NI1).  
Caution: Do not connect the UTA220 to the ISDN line until  
the UTA220 has been programmed for the correct switch,  
switch version, Terminal Endpoint Identifier (TEI) numbers,  
and Service Profile Identifiers (SPIDs). These are provided by  
the telephone company at subscription time. Use of numbers  
other than those assigned or failure to program these numbers  
in the UTA220 can result in error conditions between the  
central office switch and the terminal adapter.  
SWITCHES AND STRAPS  
The unit is factory configured to current industry standards.  
Because of different environments, some terminal adapters  
may require strap or switch changes. This section describes the  
strap and switch options and how to use them.  
Caution: Electrostatic discharge (ESD) can damage  
electronic components.  
Cover Removal  
To select or inspect the strap option, first remove the unit’s  
cover.  
Warning: Do not remove the cover unless both the power cord  
and ISDN line are unplugged.  
Place the UTA220 on its side on a flat surface. Insert a medium  
size flat screwdriver blade in one of the bottom rear latch slots.  
DO NOT PUSH the screwdriver. Lightly pry the handle away  
to disengage the lock prong from the lock clip as shown in  
Figure 3-1. Assist by pushing the cover from the chassis with  
your fingers on the unit rear edges. Repeat this procedure with  
the remaining three latch slots.  
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Getting Started  
Figure 3-1. Cover Removal  
To replace the cover, align the lock clips, rear guide grooves,  
and front lock tabs. Press the cover in place until the lock  
prongs engage the lock clip.  
SWITCH AND STRAP SETTINGS  
The following options are selected by switches or straps  
located on the PC boards inside the UTA220 housing. To  
change the strap setting, lift the jumper strap connector off and  
reinsert it in the new position. Figure 3-2 shows a typical strap  
application.  
Figure 3-2. Typical Strap Application  
Caution: Only personnel familiar with DIP switch selection  
should change switch positions or the ground strap from  
factory settings. Changes should be made only during setup.  
Signal Ground  
Signal ground is normally isolated from frame ground  
(factory). If interference exists, connect signal ground to frame  
ground by moving the strap.  
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Getting Started  
(Figure 3-3).  
Figure 3-3. Strap and Switch Locations  
V.35/EIA-232 Interface  
The V.35/EIA-232 interface cards can conform to V.35  
(factory) or EIA-232 D/E by means of two slide switches and  
a DIP switch. Slide the switches toward the front of the  
UTA220 to select V.35 and toward the rear of the UTA220 to  
select EIA-232 D/E (Figure 3-4).  
To complete the selection of EIA-232 D/E, set the DIP switch  
as indicated in Table 3-1. The following sections describe how  
to change DIP switch settings.  
Table 3-1:  
DIP Switch Settings for EIA232 D/E Operation  
DIP Switch Position  
1
2
3
4
OFF  
OFF  
ON  
ON  
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Getting Started  
Note: Ensure that both slide switches on the interface card  
are in the same position.  
Figure 3-4. V.35 EIA-232 interface Card  
Interface Card Removal  
The port 1 V.35/EIA-232 interface card must be removed from  
the UTA220 to change the DIP switch settings.  
Note: Do not remove the port 2 interface card. The port 2 DIP  
switch can be accessed without removing the card.  
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Remove the two screws from the port 1 interface card and pull  
it straight up (Figure 3-5). To re-assemble, align the interface  
card to the UTA220 PC board, press down, and insert the two  
screws.  
Figure 3-5. V.35 Switch Location  
DIP Switch Options  
The V.35/EIA-232 interface card has an eight-position DIP  
switch on the bottom (Figure 3-5). The port 2 DIP switch  
settings can be changed without removing the port 2 interface  
card. Note the orientation of the switch when changing the  
settings on port 2. The DIP switch allows you to transpose the  
Ring Indicate (RI) and Local Loopback pins (LL). Normally,  
RI is found on pin J and LL is found on pin L. However, these  
can be transposed (Table 3-2).  
Table 3-2:  
V.35 Ring Indicate Local Loopback Pinouts  
DIP Switch Position  
Pin Function  
& Location  
1
2
3
4
RI  
L*  
LL  
ON*  
ON*  
OFF*  
J*  
ON  
*default  
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Transmit clock B can be disconnected from pin AA/2 by  
turning switch position 6 to OFF. Switch positions 5, 7, 8  
should be left in their factory settings (Table 3-3).  
Table 3-3: V.35 Transmit Clock Pinout  
DIP  
Switch Position  
PinFunction  
& Location  
5
6
7
8
TC  
AA/2*  
---  
OFF*  
ON*  
OFF  
OFF*  
ON*  
Note: Extreme care should be taken to re-align the interface  
card when inserting it in the UTA220.  
CENTRAL OFFICE SWITCH  
The UTA220 is designed for easy programming and operation.  
Using the front panel LCD display and push-button, the  
UTA220 can be set up for one of the following central-office  
switches:  
• National ISDN-1  
• NTI DMS100, BCS-30, BCS-31/32 or  
• AT&T 5ESS, 5E4.2, 5E5, 5E6  
ProgrammingtheUTA220requiresthefollowinginformation,  
which is provided by the telephone company:  
• Switch type and version  
• Terminal Endpoint Identifiers (TEI)  
• Service Profile Identifiers (SPID)  
• Directory Number (DN) strings (only supplied with National  
ISDN and NTI DMS100 lines)  
This information identifies the UTA220 to the telephone  
company. Until the UTA220 has been programmed with this  
information, the telephone company will not recognize the  
terminal adapter, and calls cannot be placed.  
SETUP  
Caution: For proper operation of the UTA220, enter  
the following options exactly as given by the  
telephone company.  
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Getting Started  
Setup Step 1  
Plug the UTA220 into the power outlet. Turn the power switch  
on the rear panel ON.  
Note: Do not connect the UTA220 to the ISDN line until the  
UTA220 has been properly programmed.  
The LCD displays the banner:  
ISDN TERMINAL ADAPTER  
Setup Step 2  
To program the UTA220, perform the steps in Table 3-4. Use  
the HOME key any time to back up to correct a mistake.  
Table 3-4: Programming Steps  
STEP LCD SCREEN  
ACTION  
DISPLAY  
1
2
ISDN  
Press YES or NO key to advance to the next display.  
Press NO.  
TERMINAL ADAPTER  
DIAL/HANGUP  
OPTIONS?  
3
4
STATUS DISPLAYS?  
Press NO.  
CONFIGURATION  
OPTIONS?  
Press YES.  
5
6
7
SWITCH CONFIG  
OPTIONS?  
Press YES.  
Press YES.  
SWITCH TYPE  
OPTION?  
NATIONAL ISDN  
CHANGE?  
National ISDN  
NTI DMS100  
AT&T 5ESS  
Press NO.  
Continue programming  
with STEP 9.  
Press YES until "NTI  
DMS100" is displayed,  
then press NO.  
Press YES until  
"AT&T 5ESS" is  
displayed, then press  
NO.  
8
WILL DESTROY ALL  
NET OPTS, CONT?  
Press YES. The display momentarily shows ’RESETTING SWITCH OPTIONS"  
while it changes the switch options to the default values for the selected switch  
type.  
9
SWITCH TYPE OPTION?  
Press NO.  
10  
SWITCH VERSION  
OPTION?  
National ISDN  
NTI DMS100  
Press YES.  
AT&T 5ESS  
Press YES.  
Press No. Continue  
programming with STEP  
13.  
11  
<default version>  
VERSION. CHANGE?  
This screen displays the default version for the switch type you selected above.  
Press YES until the correct version is displayed. Press NO to select the switch  
version choice. (refer to Chapter 4, ISDN Switches section.)  
12  
13  
SWITCH VERSION  
OPTION?  
Press NO.  
D-CHANNEL  
OPTIONS?  
Press YES.  
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Table 3-4: Programming Steps (Continued)  
STEP LCD SCREEN  
DISPLAY  
ACTION  
14  
15  
16  
17  
D-CHANNEL PROV  
OPTIONS?  
Press NO.  
Press YES.  
Press NO.  
D-CHANNEL  
LAPD OPTIONS?  
CURRENT PORT = 1  
CHANGE?  
P1:X.25 TEI=DIS  
CHANGE?  
If D-channel X.25 is desired, follow the selections described in Step 18 for entering  
a TEI value. For AT&T 5ESS switches, this setting is normally "AUTO". For NT  
DMS-100 and NT-1 switches, a manual TEI (0-63) value is normally required. If  
D-Channel X.25 is not desired, press NO.  
18  
P1: DATA TEI = AUTO.  
CHANGE?  
There are three classes of possible DATA TEI value settings: "AUTO", "DIS", and  
0-63. Use one of the setup cases below that matches your TEI value.  
"AUTO"  
TEI:  
Press NO to advance to the next menu. The "AUTO"  
value is used to select a dynamically assigned TEI.  
"AUTO" is the factory default and should be correct  
in most situations.  
"DIS"  
TEI:  
Press YES to scroll through the supported TEI  
values until "DIS" is displayed. Press NO to advance  
to the next menu.  
0-63  
(UTA220k):  
Press YES twice "00" is displayed. Press the keypad  
number keys until the entire number has been keyed  
in. If the number is one digit long, press the  
appropriate number key, then press ENTER.  
0-63  
(UTA220):  
Press YES until the first digit of the value is displayed  
then press NO to accept the digit and advance to  
the next digit. Continue to do this until the entire  
number has been keyed in. If the number is one digit  
long, enter the first digit, then press YES until the  
character "_" is displayed to the right of the digit.  
Press NO to enter the TEI number.  
Note: If only one circuit-switched call at a time is necessary and the call will always  
be placed to or from the same Directory Number, then only one of the TEIs should  
be enabled and the other disabled.  
19  
20  
P1:_____________  
- The SPID only needs to be configured if the TEI is not disabled.  
- Enter the SPID string in the same manner as the TEI. The SPID value can be up  
to 20 digits in length.  
SPID.  
CHANGE?  
P1:_____________  
DN. CHANGE?  
- The Directory Number (DN) only needs to be configured if the TEI is not disabled.  
The DN is optional for AT&T 5ESS switch types.  
- Enter the DN string in the same manner as the TEIs and SPIDs. Like the SPID  
strings, the DN strings can be up to 20 digits in length.  
21  
22  
23  
24  
CURRENT PORT = 1  
CHANGE?  
Press 2.  
P2: X.25 TEI=DIS  
CHANGE?  
Press NO  
P2: DATA TEI = AUTO  
CHANGE?  
Same as Step 18.  
P2:_____________  
- The SPID only needs to be configured if the TEI is not disabled.  
- Enter the SPID string in the same manner as the TEI. The SPID value can be up  
to 20 digits in length.  
SPID.  
CHANGE?  
25  
26  
P2:_____________  
DN. CHANGE?  
- The Directory Number (DN) only needs to be configured if the TEI is not disabled.  
The DN is optional for AT&T 5ESS switch types.  
- Enter the DN string in the same manner as the TEIs and SPIDs. Like the SPID  
strings, the DN strings can be up to 20 digits in length.  
If you have a two-port unit, then continue with STEP 37.  
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Getting Started  
Table 3-4: Programming Steps (Continued)  
STEP LCD SCREEN  
ACTION  
DISPLAY  
27  
28  
29  
30  
CURRENT PORT = 2  
CHANGE?  
Press 3.  
P3:  
X.25  
TEI=DIS  
Press NO  
CHANGE?  
P3: DATA TEI = DIS.  
CHANGE?  
Same as Step 18.  
P3:_____________  
SPID. CHANGE?  
- The SPID only needs to be configured if the TEI is not disabled.  
- Enter the SPID string in the same manner as the TEI. The SPID value can be up  
to 20 digits in length.  
31  
P3:_____________  
- The Directory Number (DN) only needs to be configured if the TEI is not disabled.  
The DN is optional for AT&T 5ESS switch types.  
DN.  
CHANGE?  
- Enter the DN string in the same manner as the TEIs and SPIDs. Like the SPID  
strings, the DN strings can be up to 20 digits in length.  
32  
33  
34  
35  
CURRENT PORT = 3  
CHANGE?  
Press 4.  
P4: X.25 TEI=DIS  
CHANGE?  
Press NO  
P4: TEI = DIS.  
CHANGE?  
Same as Step 18.  
P4:_____________  
SPID. CHANGE?  
- The SPID only needs to be configured if the TEI is not disabled.  
- Enter the SPID string in the same manner as the TEI. The SPID value can be up  
to 20 digits in length.  
36  
P4:_____________  
- The Directory Number (DN) only needs to be configured if the TEI is not disabled.  
The DN is optional for AT&T 5ESS switch types.  
DN.  
CHANGE?  
- Enter the DN string in the same manner as the TEIs and SPIDs. Like the SPID  
strings, the DN strings can be up to 20 digits in length.  
37  
38  
CURRENT PORT = 4  
CHANGE?  
Press HOME.  
Press NO.  
D-CHANNEL LAPD  
OPTIONS?  
39  
D-CHANNEL PROVISION  
X.25 OPTIONS?  
Press NO.  
40  
41  
D-CHANNEL OPTIONS?  
Press NO.  
Press NO.  
MULTIFRAME SYNC =  
__________CHANGE?  
42  
43  
44  
FRONT PANEL LOCK  
OPTION?  
Press NO.  
SAVE SWITCH AND  
GLOBL TO NONVOL?  
Press YES to save the switch configuration. The display momentarily shows  
"SAVING" while it is saving the options to nonvolatile memory.  
RESTART NETWORK  
LINK?  
Plug telephone cable into ISDN U jack on rear of unit, then press YES.  
Note: Some LCD screen displays require different actions  
depending on the telephone company’s switch type.  
Setup Step 3  
Insert the ISDN line into the ISDN U jack located on the rear  
panel.  
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ISDN  
Chapter 4  
ISDN  
This chapter provides information to help you set up and use  
your Terminal Adaptor (TA). For users unfamiliar with TAs,  
some fundamental Integrated Services Digital Network  
(ISDN) concepts are presented first. If you are already familiar  
with ISDN you may skip over this section, but the ISDN  
Switches and the ISDN Addresses and Identifiers sections  
containinformation pertinent totheswitch configuration ofthe  
TA and should be reviewed.  
ISDN BASICS  
ISDN is a global system that provides a variety of high-speed  
digital telecommunication services including voice, data,  
images, and video, integrated on one network. As ISDN  
evolvesitwill providethe same typesofservicesastheexisting  
analog networks (voice and low-speeddata), plusnew services  
made possiblebyrecentadvancesincomputersanddigitaldata  
communications.  
ISDN is based on standards that define the interfaces between  
the network and the equipment connected to it. This  
standardization permits communication between ISDN  
systems and equipment manufactured by different vendors  
world wide.  
ISDN Standards  
ISDN standards are set by the International Consultative  
Committee for Telegraph and Telephone (CCITT), an  
organization that establishes communications  
recommendations under the auspices of the United Nations.  
Because ISDN technology advancesfasterthan the CCITT can  
establish standards, a number of de-facto standards have been  
developed by manufacturers of telephone equipment. While  
these set the precedence for CCITT standards eventually  
agreed to, there are enough differences that those who set up  
ISDN equipment (such as TAs) must be aware of them.  
National ISDN  
The U.S.A. and Canada have an ISDN standard for North  
America called National ISDN. The first version of this  
standard, National ISDN One (NI-1), is being adopted by  
equipment manufacturers and network providers. When fully  
deployed, NI-1 will make understanding and configuring  
ISDN equipment easier and more efficient.  
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ISDN  
Basic Rate Interface  
Several types of ISDN network services are available. The  
most common is Basic Rate Interface (BRI). BRI provides two  
B-channels(bearer channels) andone D-channel(usedtoplace  
and release calls on the network).  
B-channels, which operate at 64 kbps full-duplex, carry end-  
to-end data between network terminals. B-channels can be  
either circuit-switched (dial-up), allowing each call to be  
placed to different endpoints, or permanently connected  
(nailed) to a single endpoint. In some applications, B-channels  
can also be used to carry packet-switched data, where each  
frame of data can dynamically be sent to different network  
users. The TA does not support packet-switching on a  
B-channel.  
The D-channel is primarily a control channel between the  
network and the terminal device (such as a TA).  
Terminal Adapters  
Terminal adapters attach standard data terminals and voice  
telephones to the ISDN, allowing them to send and receive  
calls and data via the ISDN. Some terminal adapters (but not  
the UTA220) support voice service, allowing a standard  
(analog) telephone set to be connected to the ISDN.  
The UTA220 operates on the ISDN BRI. It provides circuit-  
switched data communications using circuit-switched  
B-channels for data, and uses the D-channel for signaling only.  
ISDN Basic Rate Interface Points  
BRI points and the associated devices found on customer  
premises are shown in Figure 4-1. The boxes in the diagram  
represent devices, and the vertical lines represent defined  
interface points. There are two types of DTEs represented in  
the diagram:  
• TE1 devices have a built in ISDN interface.  
• TE2 devices do not have a built in ISDN interface, and  
require a TA to interface with the ISDN.  
The data terminal devices (DTEs) are located in the left of the  
diagram. The TA is connected to the ISDN at the U interface.  
An NT1 device is not required; the NT1 function is built into  
the UTA220.  
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ISDN  
ISDN Service  
Figure 4-1. ISDN Devices and Reference Points  
To use the ISDN, you must subscribe to a network service. The  
available options depend on the carrier (telephone company),  
but some generally available options are:  
• Types of calls supported (voice, data, packetized data)  
• Circuit-switched (dial-up) or permanent (nailed) lines  
• One or two B-channels  
• A telephone number for each B-channel, or one number for  
both channels  
ISDN SWITCHES  
The device controlling the ISDN line is the central office  
switch. It is usually owned by the network provider (e.g., the  
telephone company). Each switch has its own format and  
procedures for the D-channel protocols used to establish and  
control calls. (More on D-channel protocols later.) There are  
three main ISDN switch standards used in North America:  
AT&T, Northern Telecom (NTI), and NI-1. Their basic  
functions are similar, but each has its own set of special  
features and parameters.  
Before using the TA, you must configure the unit for a switch  
type. The TA will operate with AT&T, Northern Telecom  
(NT), or any switch running National ISDN-1. Central Office  
(CO) switches can be loaded with different software versions.  
The TA supports AT&T switches running versions 5E4.2 and  
later, and NT switches running versions BCS29 and later.  
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ISDN  
AT&T switches define Single Term and Multiple Term modes  
of operation for the TA. AT&T switches support Point-to-  
Point, Multi-Point services and NI operation depending on the  
software version loaded in the switch. The switch can also  
operate in custom mode to support modes other than the  
default. Table 4-1 shows AT&T switch versions, supported  
modes, and default modes.  
Table 4-1: AT&T Switch Modes  
Switch Version Default Mode Custom Mode  
5E4.2  
5E5  
5E6  
5E7  
5E8  
Point-to-Point  
Multi-Point  
Multi-Point  
Multi-Point  
NI1  
None  
Point-to-Point  
Point-to-Point  
Point-to-Point  
Point-to-Point  
and Multi-Point  
5E9  
NI1  
Point-to-Point  
and Multi-Point  
When you set the TA for Point-To-Point switch operation, it  
runs in the single term mode and only one TA may be attached.  
Because only one TA is attached, Service Profile Identifiers  
(SPIDs) and Directory Numbers (DNs) are not needed to  
identify the TA. This is called non-initializing mode. This  
mode functions on a multi-point switch; however, the switch  
requires the TA to present its DN when it makes calls to  
distinguish it from other TAs on the line. Thus the DN must  
be properly configured in the TA in this instance.  
Normally on a multi-point line, you configure the TA for  
multi-point operation. This causes the TA to run in the  
multi-terminal-initializing mode; SPID numbers are required.  
To configure the TA for NI1operation, select NI1 as the switch  
type.  
Note: If you are using BONDING with the secondary call port,  
the DN must be entered so that it can be provided to the remote  
TA.  
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ISDN  
NT switches support three Protocol Version Control Issue  
Codes (PVCICs), depending on the software version loaded in  
the switch. Refer to Table 4-2.  
Table 4-2: Northern Telecom Switch Modes  
Switch Version Default Mode  
Other Modes  
None  
BCS29  
BCS30  
BCS31  
BCS32  
BCS33  
BCS34  
BCS35  
BCS36  
PVCIC=0  
PVCIC=0  
PVCIC=1  
PVCIC=1  
PVCIC=1  
PVCIC=2  
PVCIC=2  
PVCIC=2  
None  
PVCIC=0  
PVCIC=0  
PVCIC=0  
PVCIC=0, 1  
PVCIC=0, 1  
PVCIC=0, 1  
Set the Switch Version option on the TA according to Table  
4-3.  
Table 4-3: UTA220 Switch Settings  
PVCIC  
TA Switch  
Type  
TA Switch Version  
DMS100 PVC-IC0  
DMS100 PVC-IC1  
N/A  
0
NTI  
DMS100  
1
2
NTI  
DMS100  
National  
ISDN  
ISDN ADDRESSES AND IDENTIFIERS  
The TA contains several stored numbers–SPID, DN, and TEI  
(TerminalEndpoint Identifier)–used by the network to identify  
the TA.  
Each logical ISDN link has an SPID that defines the profile of  
services and parameters used by the terminal. The SPID is  
selected by the network carrier and must be configured into the  
TA before it can be used. The SPID is a string of characters or  
digits, depending on the switch.  
The DN is part of the service profile and is analogous to the  
telephone number on the standard telephone network. The DN  
identifies incoming calls. On some switches (NTI and NI-1),  
the DN must also be configured into the TA; on other switches  
(AT&T), the DN is not required.  
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ISDN  
The TEI is used to identify the terminal device. In most  
applications, the network switch automatically assigns a TEI  
to the TA when the connection is established; otherwise, you  
must enter the TEI before connecting to the network.  
If your switch permits it, the UTA220 allows you to use one  
SPID and one TEI on simultaneous calls. AT&T switches  
allow two calls per SPID. With this support you can configure  
two or more ports to share a DN.  
Note: To use this feature, configure each port with the same  
SPID and DN, enable one port’s TEI, and disable the TEI on  
the remaining port(s).  
The UTA220 also allows you to use multiple DNs on the same  
SPID if your switch supports it. NT switches support up to four  
DNs per SPID.  
Note: To use this feature, configure both ports with the same  
SPIDanddifferentDNs,thenenableoneport’sTEIanddisable  
the other’s.  
ISDN CHANNELS  
As previously mentioned, there are three channels available on  
the ISDN Basic Rate Interface: two 64 Kbps B-channels and  
one 16KbpsD-channel. TheB-channels arethe primarymeans  
of carrying user information, whether voice or data. Voice data  
must be sent on a B-channel. The B-channel also provides the  
most efficient path for data communications, since it has four  
times the data capacity of the D-channel.  
The D-channel is the control channel between the TA and the  
network switch. It is used mainly for exchanging signaling  
messages with the switch, to perform functions like setting up  
and releasing calls.  
Note: The UTA220 supports only data calls.  
B-Channel Data Service  
When a B-channel data call is placed, the switch allocates a  
free B-channel between the TA and the remote DCE (e.g., the  
TA at the other end of the ISDN link). This B-channel acts like  
a bit-pipe between two network users, operating  
synchronously at 64 Kbps. In most cases, the ISDN network  
does not know about the format of the data sent on the  
B-channels.  
There are several ways to use the B-channel to pass data. In  
the “clear channel” mode, data from the DTE goes directly  
ontotheB-channel. However, tousethismode,yourDTEmust  
also operate synchronously at 56 or 64 kbps.  
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ISDN  
B-Channel Data Protocols  
To allow greater flexibility for your DTE, there are three rate  
adaption protocols available for use on the B-channel: TLink,  
V.120, and Bonding. These protocols allow your DTE to  
operate both synchronously and asynchronously, and at a  
different speed than the B-channel.  
• TLink is a Northern Telecom proprietary rate adaption  
protocol. It supports synchronous and asynchronous rate  
adaption at a variety of speeds.  
• V.120 is a CCITT protocol that supports synchronous and  
asynchronous rate adaption, and also provides link-layer  
error control. Although errors on a digital network are more  
rare than on an analog telephone line, they are possible.  
V.120 provides an end-to-end protocol for detecting and  
correcting any such errors. V.120 also performs buffering  
and can thus support flow control to and from the DTE.  
• BONDING is a new protocol standard from the Bandwidth  
ON Demand INteroperability Group. It combines the  
bandwidth of several 56 kbps or 64 kbps channels, and can  
bond from 2 to 31 channels at once, if the channels are  
available. The high speed data, which must be a multiple of  
56 kbps or 64 kbps, comes in on the DTE interface and is  
split to the various channels. On the opposite end the data is  
recombined into the original data stream and sent to the DTE  
interface.  
To use a rate adaption protocol, the DCEs (e.g., TAs) at both  
ends of the link must support it and must be configured to use  
it. In general, since it is more flexible and supports error  
control, V.120 should be used for most applications, and thus  
it is the default protocol in the UTA220.  
D-Channel Signaling Protocols  
The D-channel conveys signaling information and, optionally,  
packet-switched data, to the network switch. This data is  
passed in message blocks defined by the ISDN signaling  
protocols. These protocols vary somewhat depending on the  
network switch installed at the telephone company's central  
office. As mentioned earlier, several de-facto protocol  
standards, are used for the D-channel signaling between the  
TA and the switch.  
The TA signaling protocols function on three protocol layers.  
Each of these layers is described below.  
Layer One  
Thephysical layerincludescomponents andinterfacesneeded  
to provide a physical communications path. All ISDN switches  
use the same physical layer protocols for the Basic Rate  
Interface, which are based on CCITT Recommendation I.430.  
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ISDN  
Layer Two  
The data link layer ensures error-free transmission of  
D-channel messages between the terminal and the network  
switch. The link layer in effect provides a virtual error-free  
connectionfor the next higher protocol layer to use. The LAPD  
protocol is the error detection and correction mechanism for  
layer two. Layer two protocols are based on CCITT  
recommendation Q.921, and are almost identical. Minor  
differences do exist, however, primarily in how the protocols  
respond to certain very unlikely error conditions.  
Layer Three  
The network layer consists of signaling messages passed  
between theterminaland thenetwork, using thedatalinklayer.  
These messages communicate call setup (dialing) and release  
messages from the TA, call progress information from the  
network, and messages concerning special call-related  
features. Layer three of the D-channel can also be used to  
exchange packetized data using X.25, if the TA and the switch  
are set up to allow it.  
All layer three protocols are based on CCITT  
Recommendation Q.931. However, the protocol used depends  
on the brand and version of the network switch. There are  
differences in the exact procedures used by each switch to set  
up and release calls. In addition, because switches are  
manufactured by competing companies, each switch offers a  
different set of extra features. These features are called  
supplementary services.  
Unfortunately, each vendor implements these features  
differently. Also, there are different versions of each of the  
switches, each of which implements a different set of features.  
As a result, you must configure your TA for the particular  
switch type and version so that the TA can use the correct  
signaling protocol for that switch. The switch type and version  
are two of the most important network parameters in the TA.  
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LCD Operation  
Chapter 5  
LCD Operation  
The UTA220 has an easy-to-use front panel with a Liquid  
Crystal Display (LCD). You can monitor TA status, perform  
operations, and program the TA without using a terminal or  
computer.  
LCD MENUS  
Main Menus  
The LCD menus are arranged in multiple levels. Menu headers  
may to more menu headers, options screens or action screens.  
When the NO key is pressed while a menu header is displayed,  
the LCD advances to the next menu header. When the YES  
key is pressed, the menu descends one level in the menus.  
The Main Menu headers are:  
• DIAL/HANGUP OPTIONS? - to dial manually or to dial  
previously stored telephone numbers and to hang up.  
• STATUS DISPLAYS? - to view the status of each data port  
call.  
• CONFIGURATIONS OPTIONS? - to program switch and  
port options.  
• CONFIGURATION LOAD/SAVE OPTIONS? - to save the  
switch and port configuration settings or to retrieve the  
factory settings or stored settings.  
• DIAGNOSTIC OPTIONS? - to run tests, restart the network  
and view product information.  
Submenus  
A menu includes menu headers, action screens, or option  
screens. Action screens let you perform an action, such as  
dialing. Option screens show settings and allow changes.  
Options may be set from multiple choice lists or by entering  
data.  
LCD OPERATION  
Menu Traversal  
After power-up, the LCD displays the sign-on banner: ISDN  
TERMINAL ADAPTER. To enter the Main Menu level, press  
the YES or NO key. Whenever the LCD is on the Main Menu  
level, the sign-on banner can be displayed by pressing HOME.  
In general, pressing NO moves the display vertically down a  
column (Table 5-1) and pressing YES moves the display  
horizontally across the columns (one level deeper).  
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LCD Operation  
At the last Main Menu screen, pressing NO displays the first  
Main Menu screen. At the last screen at any other level,  
pressing NO moves the display up one level.  
The deepest screen (rightmost, in the table) typically changes  
an option or performs an action. Pressing YES at this screen  
begins the change process on the option, or performs an action.  
Table 5-1. Menu Option Summary  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
ISDN  
TERMINAL  
ADAPTER  
DIAL/HANGUP  
Current Port:  
n
OPTIONS?  
Pn:ENTER  
NUMBER TO  
DIAL?  
Pn:----------  
ENTER#.  
CHANGE  
n=current port. Note 2  
Pressing Call/Hangup from  
anywhere in menu advances to  
ENTER NUMBER screen  
Pn:REDIAL? x  
n=current port  
x=last number dialed. Note 2  
Pn:DIAL  
STORED NUM- s  
BER?  
Pn:DIAL TEL #t?  
n=current port  
s =stored number t=0-9 storage  
index. Note 2  
Pn:VIEW/  
CHANGE  
STORED TEL  
NUM?  
Pn:x. Tel #t.  
CHANGE?  
n=current port  
x= 13 digits of the phone num-  
ber. Phone number can contain  
40 digits, scrolled 1 digit / sec.  
t=0-9 storage index. Note 3  
Pn: HANGUP?  
Current Port= n.  
Change?  
n=current port. Note 2  
n=current port  
STATUS  
DISPLAYS?  
CALL STATUS SCREEN  
s =IDLE, SETTING UP,  
DIALING, PROCEEDING,  
RINGING, ECHO  
CANCELING ONLINE,  
INCOMING CALL,  
ANSWERING,  
DISCONNECTING, BUSY,  
DISCONNECTED  
OR  
Pn:ONLINE  
prmd  
p=CLEAR, BOND, T-LINK,  
V.120  
m=SYNC-1, SYNC-2, ASYNC  
r =300, 1200, 2400, 4800, 9600,  
1k, 38k, 48k, 56k, 57k, 64k,  
112k, 128k  
d=8E, 8O, 8N, 7E, 7O, 7N, 7M  
This screen appears once a call  
is connected. Note 4  
CONFIGURA- SWITCH  
SWITCH TYPE x.CHANGE?  
OPTION?  
x=NATIONAL ISDN, NT  
TION  
DMS100,  
SELECTED  
AT&T  
5ESS  
CONFIG  
OPTIONS?  
OPTIONS?  
WILL DESTROY RESETTING  
The query appears only if the  
NET  
CONT?  
OPTS, SWITCH  
OP- network type has changed.  
TIONS  
SWITCH  
VERSION  
OPTION?  
x
VERSION.  
x=5ESS MULTIPOINT, 5ESS  
PT TO PT, (if switch type=ATT)  
CHANGE?  
x=DMS100 PVC IC-0, DMS100  
PVC IC-1 (if switch type = NT)  
Navigation button  
directions:  
YES  
NO  
HOME  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
SWITCH  
CONFIG  
OPTIONS?  
(cont.)  
B-CHANNEL  
OPTIONS?  
B-CHANNEL B1 = x  
PROV  
x= NONE, PERMANENT  
CHANGE?  
OPTIONS?  
B2 = x  
x= NONE, PERMANENT  
CHANGE?  
D-CHANNEL OP- D-CHANNEL D-CHAN PROVI- x= NONE, X.25  
TIONS?  
PROV  
SION x. CHANGE?  
OPTIONS?  
D-CHANNEL CURRENT PORT n=1 or 2  
LAPD  
= n. CHANGE?  
OPTIONS?  
Pn:X.25 TEI = x. n=CURRENT PORT  
CHANGE?  
x= 0-63, DIS, AUTO  
Pn:DATA TEI =x n=CURRENT PORT  
CHANGE?  
x= 0-63, DIS, AUTO  
Pn:x  
CHANGE?  
SPID. n=CURRENT PORT  
x=SPID, up to 20 digits  
DN. n=CURRENT PORT  
x=DN, up to 20 digits  
Pn:  
CHANGE?  
x
D-CHAN  
PROVISION  
X.25  
RX  
SIZE=x.  
WINDOW x=1 - 7  
CHANGE?  
OPTIONS?  
TX  
WINDOW x=1 - 7  
SIZE=x.  
CHANGE?  
RX  
PACKET x=128, 256  
SIZE=x.  
CHANGE?  
TX  
PACKET x=128, 256  
SIZE=x.  
CHANGE?  
PVC NUMBER =x x=0 - 255  
CHANGE?  
INC LOGICAL x=0 - 255  
CHAN NUM=x.  
CHANGE?  
2-WAY  
LOG x=0 - 255  
CHAN NUM=x.  
CHANGE?  
OUT LOGICAL x=0 - 255  
CHAN NUM=x.  
CHANGE?  
SEQUENCE NUM- x=8, 128  
BER MOD=x.  
CHANGE?  
FRONT PANEL ENTER PASS-  
Enter password to gain access  
to lock option screen.  
LOCK  
WORD -------  
CHANGE?  
OPTION?  
FRONT PANEL  
x= UNLOCKED, OPTIONS,  
OPT/ACT  
LCK  
=
x
CHANGE?  
SAVE SWITCH SAVING  
AND GLOBL TO  
NONVOL?  
Navigation button  
directions:  
YES  
NO  
HOME  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
PORT CONFIG CURRENT  
n=1 - 2  
OPTIONS?  
PORT=n  
CHANGE?  
Pn:LOAD FROM Pn:LOAD FROM LOADING  
n=current port  
x= 0, 1  
NONVOL?  
NONVOL  
CHANGE?  
x.  
Pn:LOAD FROM Pn:LOAD  
LOADING  
n=current port  
x= 0, 1  
FACTORY  
PROFILE?  
FACTORY  
PROF  
x.  
CHANGE?  
Pn: ANSWER Pn:AUTO  
OPTIONS?  
n=current port  
x= ON, OFF  
ANSWER=x  
CHANGE?  
Pn: RINGS  
n=current port  
x= 0 - 255  
UNTIL ANS =x.  
CHANGE?  
Pn:DTE  
Pn:xxx.  
CHANGE?  
n=current port  
OPTIONS?  
x= SYNCHRONOUS 1,  
SYNCHRONOUS 2, ASYN-  
CHRONOUS  
Pn:DTE SPEED  
=xxx  
CHANGE?  
n=current port  
n=300, 1200, 2400, 4800, 9600,  
19.2k, 38.4k, 48k, 56k, 57.6k,  
64k, 112k, 128k  
Pn:WORD  
LENGTH=  
CHANGE?  
n=current port  
x= 7, 8  
x
Pn:PARITY=x.  
CHANGE?  
n=current port  
x= NONE, EVEN, ODD, MARK  
n=current port  
Pn:  
CHARACTER  
x= OFF, ON  
ECHO  
=
xxx.  
CHANGE?  
Pn: X25XPAR=x.  
CHANGE?  
n=current port  
x=YES, NO  
Pn:  
GUARD=  
CHANGE?  
DTE  
x.  
n=current port  
x= OFF, ON  
Pn: DTE CMD Pn:DIALER  
n=current port.  
AND  
CMDs  
CHANGE?  
=
x.  
for ports 1-2: x=NONE, AT, PAD,  
PAD D, V25 BCS, V25 HDLC  
MESSAGE  
OPTIONS?  
for ports 3-4: x=NONE, AT, PAD,  
PAD D, EIA-366  
Pn: AT  
Pn: STATUS DIS- n=current port  
PLAY  
CHANGE?  
x.  
OPTIONS?  
x=ON, OFF, ANS OFF  
Pn:MSG  
n=current port  
FORMAT=  
CHANGE?  
x. x=VERBOSE, NUMERIC  
n=current port  
Pn:RESULT  
CODES OPT=x.  
CHANGE?  
x= OFF, ON  
Pn:CONNECT n=current port  
MSGS  
CHANGE?  
=
x.  
x= BASIC, ALL, BUSY  
Navigation button  
directions:  
YES  
NO  
HOME  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
CONFIGURA- PORT CONFIG Pn: DTE CMD Pn: AT  
Pn:  
ESCAPE n=current port  
TION  
TIONS? (cont.) (cont.)  
OP- OPTIONS? ? AND  
CHAR=x.  
CHANGE?  
OPTIONS?  
(cont.)  
x= 0 - 127; 128-255 disabled  
MESSAGE  
OPTIONS? (cont.)  
Pn:CR CHAR=x. n=current port  
CHANGE?  
x= 0 - 127  
Pn:LF CHAR=x. n=current port  
CHANGE?  
x= 0 - 127  
Pn:BS CHAR=x. n=current port  
CHANGE?  
x= 0 - 127  
Pn:GUARD  
TIME=x.  
CHANGE?  
n=current port  
x= 0 - 255  
Pn: X.3 PARMS? Pn:SESSION = s. n=current port  
CHANGE?  
s = 1 - 4  
PnSsR1:PAD  
RECAL CHAR=x. s = current session  
CHANGE? x= 000 - 126  
PnSsR2:ECHO=x. n=current port  
CHANGE? s = current session  
x= ENABLE, DISABLE  
n=current port  
PnSsR3: DATA n=current port  
FWD CHAR = x.  
s = current session  
CHANGE?  
x= 0, 2, 126  
PnSsR4:IDLE  
TIME DELAY = x.  
CHG?  
n=current port  
s = current session  
x= 0-127  
PnSsR5:ANCIL n=current port  
DEV CTL= x.  
s = current session  
CHANGE?  
x =NONE, DATA, DATA CMD  
PnSsR6:PAD  
n=current port  
SERV  
CHANGE?  
SIG=x.  
s = current session  
x= SUPRESS, ALL-PRM,  
PROMPT, ALL  
PnSsR7:BREAK n=current port  
SIG ACT= x.  
s = current session  
CHANGE?  
x= 00 - 37  
PnSsR8:  
n=current port  
DISCARD  
CHANGE?  
=
x. s = current session  
x= NORMAL, DISCARD  
n=current port  
PnSsR9:PAD  
AFTER CR=x. s = current session  
CHANGE?  
x= 000 - 255  
PnSsR10:LINE n=current port  
FOLDING=x.  
CHG?  
s = current session  
x= 000 - 255  
PnSsR11:PAD n=current port  
DTE  
x.CHG?  
SPEED=  
s = current session  
x= 300, 600, 1200, 2400, 4800,  
9600, 19200, 38400  
PnSsR12:PAD n=current port  
FLOW CTL=x.  
s = current session  
CHG?  
x= OFF, ON  
PnSsR13:LF INS n=current port  
AFTER CR=x.  
s = current session  
CHG?  
x= 0 - 7  
Navigation button  
directions:  
YES  
NO  
HOME  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
PnSsR14:PAD n=current port  
AFTR  
CHANGE?  
LF=x.  
s = current session  
x= 000 - 255  
PnSsR15:  
n=current port  
EDITING=x.  
CHANGE?  
s = current session  
x= ENABLE, DISABLE  
Navigation button  
directions:  
YES  
NO  
HOME  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
CONFIGURA- PORT CONFIG Pn: DTE CMD Pn: X.3 PARMS? PnSsR16:CHAR n=current port  
TION  
TIONS? (cont.) (cont.)  
OP- OPTIONS? ? AND  
(cont.)  
DEL CHAR=x.  
CHANGE?  
s = current session  
x= 000 - 127  
MESSAGE  
OPTIONS? (cont.)  
PnSsR17:LINE n=current port  
DEL CHAR=x.  
s = current session  
CHANGE?  
x= 000 - 127  
PnSsR18:LINE n=current port  
DIS  
CHANGE?  
CHAR=x.  
s = current session  
x= 000 - 127  
PnSsR19:EDIT n=current port  
SRV SIG =x.CHG?  
s = current session  
x= NONE, PRINTER, DISPLAY  
PnSsR20:ECHO n=current port  
MASK=x.  
CHANGE?  
s = current session  
x= 000 - 255  
PnSsR21:PARITY n=current port  
CHECK=x.  
s = current session  
CHANGE?  
x= YES, NO  
PnSsR22:PAGE n=current port  
WAIT  
CHANGE?  
=
x.  
s = current session  
x= 000 -255  
Pn:DTE PIN  
OPTIONS?  
Pn:DTR  
OPT=  
CHANGE?  
PIN  
x.  
n=current port  
x= IGNORE, RCAL ACU, HANG  
UP, RELOAD, DIAL  
Pn:DSR  
OPT=  
CHANGE?  
PIN  
x.  
n=current port  
x= ON, NORMAL  
Pn:DCD PIN  
n=current port  
OPT=  
CHANGE?  
x.  
x= ON, NORMAL, DISC OFF  
Pn:CTS  
OPT=  
CHANGE?  
PIN  
x.  
n=current port  
x= RTS, ON  
Pn:DCD DROP  
TIME=x.  
CHANGE?  
n=current port  
x= 000 -255  
Pn:DTR  
TECT TIME=x.  
CHANGE?  
DE-  
n=current port  
x= 000 -255  
Pn:RTS TO CTS  
TIME=x.  
CHANGE?  
n=current port  
x= 000 -255  
Pn: ISDN  
Pn:PROTO-  
COL=a.  
CHANGE?  
n=current port  
PROTOCOL  
OPTIONS?  
a = V.120, X.25, Clear, TLink,  
Bond  
Pn:RATE  
n=current port  
a = 1,2  
MULTIPLR=a.  
CHANGE?  
Pn:FLOW CON- PN:x.FLOW CTL. n=current port  
TROL  
CHANGE?  
x= NO, UNI CTS, BI RTS/CTS,  
OPTIONS?  
BI XON/XOFF  
Pn:RESET FLOW n=current port  
CTL x.  
CHANGE?  
=
x= EN, DIS  
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Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
CONFIGURA- PORT CONFIG Pn: ISDN  
Level 2  
Level 3  
Pn:V.120  
OPTIONS?  
Level 4  
Pn:MAX  
FRAME SIZE=x.  
CHANGE?  
Description  
TX n=current port  
TION  
OP- OPTIONS?  
?
PROTOCOL  
OPTIONS?  
x= 1-260  
TIONS? (cont.) (cont.)  
(cont.)  
Pn:MAX  
RX n=current port  
FRAME SIZE=x.  
CHANGE?  
x= 1-260  
Pn:WINDOW SIZE n=current port  
= x. CHANGE?  
x= 1-127  
Pn:T200 TIMER= n=current port  
x.  
x= 1-255  
CHANGE?  
Pn:INFO FRM n=current port  
SLCT=x.  
x= I Frame, UI Frame  
CHANGE?  
Pn:TLINK  
Pn:x. CHANGE?  
n=current port  
OPTIONS?  
x= ADAPTIVE MODE, FIXED  
MODE  
Pn:DTR=x.  
CHANGE?  
n=current port  
x= ASSERT, NORMAL  
n=current port  
Pn: RTS=x.  
CHANGE?  
x= ASSERT, NORMAL  
n=current port  
Pn:SESSION Pn:SESSION =s.  
OPTIONS?  
CHANGE?  
s = 1 - 4  
PnSs:X.25  
OPTIONS?  
PnSs:RX  
n=current port  
WINDOW SIZE=x. s = current session  
CHANGE?  
x= 0 - 8  
PnSs:TX  
n=current port  
WINDOW SIZE=x. s = current session  
CHANGE?  
x= 0 - 8  
PnSs:RX  
PKT  
n=current port  
SIZE=x. s = current session  
CHANGE?  
x= 0, 128, 256, 512, 1024  
n=current port  
PnSs:TX  
PKT SIZE  
CHANGE?  
=
x. s = current session  
x= 0, 128, 256, 512, 1024  
n=current port  
PnSs:PVC  
OPTION=x.  
CHANGE?  
s = current session  
x= PVC, NON-PVC  
PnSs: LOGICAL n=current port  
CHN  
CHANGE?  
NUM=x.  
s = current session  
x= 000 - 255  
PnSs:D BIT CONF n=current port  
= x.  
CHANGE?  
s = current session  
x= ON, OFF  
PnSs:CUG  
n=current port  
OPTION=x.  
CHANGE?  
s = current session  
x= NONE, BASIC, OUTGOING,  
BILAT  
PnSs:CUG  
NAME=x.  
CHANGE?  
n=current port  
s = current session  
x= Closed User Group Name  
PnSs:REVERS n=current port  
CHRG OPT=x  
s = current session  
CHANGE?  
x= DIS, EN  
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Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
CONFIGURA- PORT CONFIG Pn:SESSION PnSs:X.25  
PnSs:RX  
n=current port  
TION  
TIONS? (cont.) (cont.)  
OP- OPTIONS? ? OPTIONS?  
OPTIONS?  
(cont.)  
THRUPUT=x  
CHANGE?  
s = current session  
(cont.)  
x= 0, 75, 110, 300, 600, 1200,  
2400, 4800, 9600, 19200,  
48000, 64000  
PnSs:TX  
n=current port  
THRUPUT=x  
CHANGE?  
s = current session  
x= 0, 75, 110, 300, 600, 1200,  
2400, 4800, 9600, 19200,  
48000, 64000  
x
PnSs:NUI. n=current port  
CHANGE?  
s = current session  
x= NUI, up to 16 digits  
x
PnSs:RPOA. n=current port  
CHANGE?  
s = current session  
x= RPOA, up to 16 digits  
Pn Ssx: USER n=current port  
DAT.  
s = current session  
CHANGE?  
x= User Data, up to 12 digits  
PnSs:TRANST n=current port  
DELY=x.  
s = current session  
CHANGE?  
x= 00000-65535  
n=current port  
PnSs:PKT  
RST/CLR TMR=x. s = current session  
CHANGE?  
x= 000 - 600  
PnSs:PKT  
n=current port  
CALL TMR=x. s = current session  
CHANGE?  
x= 000 - 600  
PnSs:AUTO  
n=current port  
ACCEPT VC=x. s = current session  
CHANGE?  
x= EN, DIS  
Pn:CALL  
SETUP  
Pn:  
ISDN  
n=current port  
x=64K, 56K  
SPEED=x BPS.  
CHANGE?  
OPTIONS?  
Pn: PERSIST DI-  
AL=x.  
n=current port  
x=ENABLED, DISABLED  
CHANGE?  
Pn:  
n=current port  
ORIGINATE AS  
x. CHANGE?  
x= DATA, AUDIO, SPEECH  
Pn:ANS DATA x.  
CHANGE?  
n=current port  
x= ENABLED, DISABLED  
n=current port  
Pn:ANS  
AUDIO  
CHANGE?  
x.  
x= ENABLED, DISABLED  
Pn:ANS  
SPEECH  
CHANGE?  
n=current port  
x.  
x
x= ENABLED, DISABLED  
Pn:DIAL  
CHANGE?  
n=current port  
x=ENBLOC, OVERLAP  
n=current port  
Pn:ECHO  
DISABLE  
TONE=  
x= OFF, ON  
x.  
CHANGE?  
Pn:WAIT FOR  
n=current port  
x= 0-255  
CONN=  
x.  
CHANGE?  
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Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Pn: SAVE TO Pn:SAVE TO  
NONVOL?  
Level 3  
Level 4  
Description  
n=current port  
x= 0, 1  
SAVING  
NONVOL  
CHANGE?  
x.  
CONFIGURA- PORT CONFIG Pn:PWR-UP  
TION OP- OPTIONS? ? USER PROF = x.  
TIONS? (cont.) (cont.) CHANGE?  
n=current port  
x= 0, 1  
CONFIG LOAD/ LOAD/SAVE SAVE  
SAVE SETUP  
TO NONVOL x.  
CHANGE?  
SAVING  
LOADING  
LOADING  
x= 0, 1  
x= 0, 1  
x= 0, 1  
n=1 - 2  
SAVE  
TIONS?  
OP- SETUP?  
COMPLETE  
SETUP TO NON-  
VOL?  
LOAD  
PORTS FROM FROM  
NONVOL?  
ALL LOAD PORTS  
NONVOL  
x.  
CHANGE?  
LOAD PORTS LOAD  
FROM  
FACTORY PRO- PROF  
FILE? CHANGE?  
FACTORY  
x.  
LOAD/SAVE CURRENT  
PORT CONFIG PORT=n  
OPTIONS?  
CHANGE?  
Pn:SAVE PORT Pn:SAVE TO  
SAVING  
n=current port  
x= 0, 1  
TO NONVOL?  
NONVOL  
CHANGE?  
x.  
Pn:LOAD PORT Pn:LOAD FROM  
FROM NONVOL?  
LOADING  
n= current port  
x= 0, 1  
NONVOL  
CHANGE?  
x.  
Pn:LOAD FROM Pn:LOAD FAC-  
FACTORY PRO- TORY PROF x.  
LOADING  
n=current port  
x= 0, 1  
FILE?  
LOAD/SAVE SAVE SWITCH  
SWITCH CFG TO  
CHANGE?  
SAVING  
CONFIG OP- NONVOL?  
TIONS?  
LOAD SWITCH  
CFG FROM FAC-  
TORY?  
LOADING  
LOADING  
LOAD SWITCH  
CFG  
FROM  
NONVOL?  
DIAGNOSTIC  
OPTIONS?  
GLOBAL TEST?  
Note 5  
Note 6  
Note 7  
2B+D  
BACK?  
LOOP-  
IN  
TEST  
GLOBAL TEST STATUS s =  
PROGRESS s  
2B+D LOOPBACK. Note 8  
END TEST?  
TEST  
COMPLETE  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
DIAGNOSTIC PORT TEST?  
OPTIONS?  
CURRENT PORT  
= n. CHANGE?  
Note 9  
(cont.)  
Pn:  
LOOPBACK?  
LOCAL  
Note 10  
Note 10  
Pn: LOCAL TER-  
MINAL LOOP-  
BACK?  
Pn:  
LOOPBACK?  
DIGITAL  
Note 10  
Note 10  
Pn:  
BILATERAL  
LOOPBACK?  
Pn:TEST  
PROG s  
IN  
n=current port  
PORT TEST STATUS  
s = LOCAL LOOPBACK, LOCAL  
TERMINAL LOOPBK, DIGITAL  
LOOPBACK, BILATERAL  
LOOPBACK. Note 11  
END TEST?  
TEST  
COMPLETE  
DISPLAY STA- SOFTLOAD s  
s
=
NOT INITIATED, IN  
TUS  
SOFT-  
PROGRESS, COMPLETE,  
FAILED  
LOAD?  
RESTART NET- RESETTING  
The ISDN line is restarted using  
the save switch setting  
WORK LINK?  
LINK  
FRONT  
KEYBOARD  
TEST  
PANEL  
For numeric keypad:  
* TO END displays.  
For 3-button keypad:  
HOME TO END displays.  
* TO END  
KEYPAD TEST?  
OR  
HOME TO END  
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LCD Operation  
Table 5-1. Menu Option Summary (Continued)  
Main Level Level 1  
Level 2  
Level 3  
Level 4  
Description  
VIEW  
PRODUCT  
INFORMATION  
b-s c p  
b = board number  
s = software revision  
c = checksum  
p = PASS or FAIL  
VIEW  
DIAGNOSTIC  
c = diagnostic code value to aid  
in field support.  
DIAGNOSTIC CODE =c.  
CODE?  
CLEAR  
CLEARING  
Resets diagnostic code value to  
0.  
DIAGNOSTIC DIAGNOSTIC  
CODE VALUE? CODE  
Notes:  
1. The next screen will be either the ENTER NUMBER TO DIAL? screen or the HANGUP? screen,  
depending on the call status of the port. If the call status is IDLE, ENTER NUMBER TO DIAL?  
is displayed; otherwise, HANGUP? is displayed.  
2. The LCD advances to the call status screen.  
3. VIEW/CHANGE STORED TEL NUM? screen is the last submenu under DIAL/HANGUP OPTS.  
4. Pressing YES or NO advances the LCD to the ENTER NUMBER TO DIAL? or the HANGUP?  
screen (depending on the current status: IDLE: the LCD advances to DIAL?; otherwise the LCD  
advances to HANGUP?).  
5. Answering YES to DIAGNOSTIC OPTIONS? advances the LCD to the PORT TEST? screen if  
a port test is in progress. Otherwise, the LCD advances to the GLOBAL TEST? screen.  
6. Answering YES to GLOBAL TEST?, advances the LCD to the test status screen if a global test  
is currently in progress. Otherwise, the LCD advances to 2B+D LOOPBACK?  
7. Answering YES advances the LCD to the global test status screen.  
8. Pressing YES or NO advances the LCD to the END TEST? screen.  
9. Answering YES advances the LCD to the test status screen if a port test is currently in progress.  
Otherwise, the LCD advances to the CURRENT PORT screen.  
10. Answering YES advances the LCD to the global test status screen.  
11. Pressing YES or NO advances the LCD to the END TEST? screen  
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V.25 bis Dialer Operation  
Chapter 6  
V.25 bis Dialer Operation  
V.25 bis is an autodialer option used by synchronous DTEs to  
perform dialing and UTA220 control functions. The UTA220  
supports a subset of the CCITT V.25 bis recommendation,  
primarily intended for the dialing and answering commands  
for HDLC or BISYNC modes of V.25 bis operation.  
SELECTING V.25bis  
The V.25 bis option can only be selected using the LCD menu  
or the AT@P1 command  
To select V.25 bis with the LCD, scroll through the menu and  
select:  
• CONFIGURATION OPTIONS?  
• PORT CONFIG OPTIONS?  
• DTE CMD AND MSG OPTIONS?  
• DIALER CMDS = V.25 BSC for BISYNC mode or  
DIALER CMDS = V.25 HDLC for HDLC mode  
To select V.25 bis with the AT@P1 command, enter  
• AT@P1 = VB for V.25 bis BISYNC mode or  
AT@P1 = VH for V.25 bis HDLC mode.  
The DTR pin is used to activate the V.25 bis dialer. When the  
DTR pin goes high, the dialer command setting is used to start  
the appropriate V.25 bis mode. When changing between V.25  
mode settings, drop and raise DTR to activate the new V.25  
bis dialer mode.  
You can select the speed of the dialer by changing the DTE  
SPEED option. When you select V.25 bis dialer operation, the  
DTE SPEED is used to configure the dialer port speed.  
OPERATION IN V.25 bis MODE  
When the V.25 bis option is enabled, most UTA220 options  
still apply. Selecting V.25 bis forces the UTA220 into  
synchronous communications mode (regardless of the  
synchronous mode option). Only the DCD pin option setting  
applies when V.25 bis is enabled and the UTA220 is off-line.  
V.25 bis MESSAGE FRAMES  
The CCITT V.25 bis recommendation describes several  
message framing formats, including Async, BISYNC, and  
HDLC (bit-oriented). The UTA220 supports the HDLC and  
BISYNC modes. The ASCII (IA5) character set is used; the  
EBCDIC character set is not supported.  
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V.25 bis Dialer Operation  
In HDLC operation mode, V.25 bis command and response  
messages are contained in standard HDLC Unnumbered  
Information (UI) frames (Figure 6-1). Each field consists of  
one or more eight bit octets. The eighth bit (parity bit) of each  
octet in the Message field is ignored by the UTA220.  
Figure 6-1. HDLC Frame for V.25 bis Messages  
In BISYNC mode of operation, all V.25 bis commands and  
response messages are contained in frames (Figure 6-2).  
Figure 6-2. BISYNC Frame for V.25 bis Messages  
The message field in the frame is composed of 7-bit IA5  
characters with the eighth bit set for odd parity. If the HDLC  
or BISYNC frames are improperly formatted, the frames are  
ignored.  
For more information on V.25 bis formatting and protocol  
procedures, refer to the CCITT V.25 bis recommendation.  
DTE INTERFACE PINS  
The UTA220 supports V.35 and EIA-232 interfaces to the  
DTE for V.25 bis dialing. The function of some pins on the  
EIA-232 interface is different than in other synchronous  
modes.  
DTR Pin Operation  
DCD Pin Operation  
For the UTA220 to accept V.25 bis commands, the DTE must  
hold the DTR signal high. When configured for V.25 bis  
dialing, the DTR pin option setting does not apply because the  
V.25 bis specification explicitly defines how the dialer will  
respond to changes in DTR.  
The default operation of the V.25 bis dialer asserts the DCD  
pin when DTR is high (DCD follows DTR). Some devices  
may require DCD to be low until the connection is established.  
For those devices, the UTA220 can be configured to only raise  
DCD upon connection by setting the DCD pin option to  
NORMAL. The DCD pin option setting of ON is the default  
for CCITT V.25 bis operation.  
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V.25 bis Dialer Operation  
CTS Pin Operation  
DSR Pin Operation  
The UTA220 asserts the CTS pin when DTR is high (CTS  
follows DTR), except that CTS goes low during the connect  
sequence.  
The UTA220 holds the DSR pin low until a connection is  
established.  
COMMAND PROCEDURES  
When the UTA220 is in V.25 bis command mode, it awaits the  
receipt of a V.25 bis command from the DTE. Each command  
must be contained in a separate frame. The UTA220 also sends  
indications to the DTE to advise it of call status.  
Commands may be upper or lower case. Responses and  
indications from the UTA220 are always uppercase.  
Commands cannot contain leading or embedded spaces or  
other characters, but some commands allow clarity characters  
in the parameter string that follows the command.  
Each command message consists of a three octet command  
code and a 0 to 60 octet parameter field (depending on the  
command). The UTA220 parses the command, returns a  
response message, and then executes the command.  
COMMANDS  
Commands are messages sent by the DTE to the UTA220 to  
cause it to perform a given operation. The commands are listed  
on the following pages.  
Dial Command: CRN xx..x  
The CRN (Dial) command contains a parameter field of one  
to 40 characters (excluding clarity characters) specifying the  
number to dial and any dial modifiers. Clarity characters,  
which are ignored by the UTA220, consist of spaces, dashes,  
parenthesis, and periods. Valid dial characters and modifiers  
are shown in Table 6-1.  
Table 6-1: V.25 bis Dial Parameters  
Character  
0-9  
Function  
Dial digits  
* and #  
Dial digits  
Space, dash,  
parenthesis, and period  
Clarity characters  
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V.25 bis Dialer Operation  
After dialing, the UTA220 attempts to establish a synchronous  
connection with the remote UTA220. As in other synchronous  
modes, flow control and buffering are not used when V.25 bis  
is enabled. When the call begins the connection sequence, the  
UTA220 sends a Call Connect Indication (CNX) message.  
Upon connection, the UTA220 raises the DSR pin and enters  
the on-line data mode.  
Examples of valid dial commands are:  
CRN 12055550123  
CRN 1 (205) 555-0123  
CRN 9 1-205-555-0123  
Responses to the dial command are:  
VAL  
INVCU  
INVMS  
INVPS  
INVPV  
CFI  
CFIDT  
CFIET  
CFIRT  
CFIAB  
Refer to Table 2 for a description of these response messages.  
Connect Incoming Calls: CIC  
This command forces the UTA220 to answer an incoming call  
if the porton which the callisreceived is configuredformanual  
answer (the auto-answer option is set to off). No parameters  
are allowed. The DTE typically issues this command after  
receiving an INC indication from the UTA220.  
Responses to the CIC command are:  
VAL  
INV  
INVMS  
INVPS  
INDICATION MESSAGES  
Indication messages are unsolicited messages sent by the  
UTA220 to indicate a special condition, such as an incoming  
call. These messages are described below.  
Call Connect Indication: CNX  
The UTA220 sends this message to the DTE to indicate that  
an incoming or outgoing call is physically connected end-to-  
end. The call connection sequence is then started. The DTE  
should not begin sending data until the call connection  
sequence is completed, which theUTA220indicatesbyraising  
the DSR pin.  
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V.25 bis Dialer Operation  
Incoming Call Indication: INC  
Upon receiving an incoming call, the UTA220 sends the DTE  
an Incoming Call Indication (INC). Only one indication is  
given per call. If the auto-answer option is on, the UTA220  
will answer the call after the number of rings designated by the  
S0 command.  
Response Messages  
A response message is sent by the UTA220 immediately after  
it receives a V.25 bis command message. Response messages  
are shown in Table 6-2.  
Table 6-2: Response Messages  
Character  
Function  
VAL  
Valid Command.  
INV  
Invalid Command. Command is invalid or inappropriate.  
INVCU  
Command Unknown. Transmission error (parity, framing)  
occurred.  
INVMS  
INVPS  
Invalid Message Syntax. Command is too long; command contains  
invalid characters.  
Invalid Parameter Syntax. Wrong number of parameters;  
parameter contains invalid character or too many characters.  
INVPV  
CFIAB  
CFICB  
CFIDT  
CFIET  
CFINT  
CFIRT  
CFI  
Invalid Parameter Value. Parameter is out of range or is null.  
Call Failure, Call Aborted.  
Call Failure, Local DCE busy.  
Call Failure, No Dial Tone.  
Call Failure, Busy.  
Call Failure, No Answer Tone.  
Call Failure, Connect Time-out.  
Call Failure, Reason Unknown.  
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EIA-366 Dialer Operation  
Chapter 7  
EIA-366 Dialer Operation  
The UTA220 implements the EIA-366 dialer in accordance  
with the EIA Standard RS-366 specification.  
CONFIGURATION  
The upper two ports of the UTA220 are configured as  
EIA-366 dialer ports. In this configuration, the lower two ports  
functionasthedataportsforthedialer ports. TheEIA-366dialer  
ports are dedicated to the data ports as follows:  
• Dialer port 3 is dedicated to data port 1  
• Dialer port 4 is dedicated to data port 2  
OPERATION  
Calls are initiated through the parallel dialer port interface (the  
upper two ports).  
The DTE connects to the dialer port by the DB-25 connector.  
Connector functions are shown in Table 7-1.  
Note: If an EIA-366A device is to be connected to a port, refer  
to EIA-366A Requirements section in Appendix D.  
Table 7-1: Dial Connector Functions  
Pin  
Function  
1
Frame Ground  
2
Digit Present (DPR)  
3
Abandon Call and Retry (ACR)  
Call Request (CRQ)  
4
5
Present Next Digit (PND)  
Power Indication (PWI)  
Signal Ground  
6
7
13  
14  
15  
16  
17  
22  
Distant Station Connected (DSC)  
Digit Lead 1 (NB1)  
Digit Lead 2 (NB2)  
Digit Lead 3 (NB4)  
Digit Lead 4 (NB8)  
Data Line Occupied (DLO)  
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EIA-366 Dialer Operation  
INTERFACE SIGNAL DEFINITIONS  
Power Indication (PWI)  
PWI is supplied by the dialer to indicate the dialer has power.  
Call Request (CRQ)  
CRQ is supplied by the DTE to request the dialer to initiate a  
call. The on condition must be maintained during call  
origination. If CRQ is turned off before DSC is turned on, the  
call is aborted. CRQ should not be turned on if DLO is on.  
DLO indicates that the data port is in use and a call cannot be  
initiated.  
Data Line Occupied (DLO)  
DLO is sent by the dialer to indicate when the data port is in  
use. Off indicates the DTE can originate a call provided that  
PWI is on.  
Distant Station Connected (DSC)  
DSC is supplied by the dialer to indicate that a call has been  
completed and that the dialer is no longer in control of the data  
port. Once the dialer has relinquished control of the data port,  
DSC remains on until CRQ is turned off.  
Digit Signal Circuits (NB1-NB8)  
The DTE presents binary data to the dialer for dialing or dialer  
control purposes. Table 7-2 shows the dial digit character set  
supported by the EIA-366A dialer.  
Table 7-2: Dial Digit Character Set  
Digit  
NB8  
0
NB4  
0
NB2  
0
NB1  
0
0
1
2
3
4
5
6
7
8
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
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EIA-366 Dialer Operation  
Table 7-2: Dial Digit Character Set (Continued)  
Digit  
NB8  
NB4  
NB2  
NB1  
9
1
1
1
1
0
0
0
1
0
1
1
0
1
0
1
0
*
#
< (EON)  
The telephone number can have up to 40 digits, including  
special characters. If more than 40 digits are received, the dialer  
turns on ACR and waits for CRQ to drop. The characters are  
defined as follows:  
* and #:  
These are used for clarity only.  
EON digit:  
The EON digit is used when the line is  
configured as a nailed-up line. The EON  
digit signals that the end of the number has  
been received. When it is received, DSC is  
turned on. When configured for nail-up  
line, it is not necessary to wait for the  
connection before turning on DSC.  
Other characters defined by EIA-366 are not supported by the  
UTA220 dialer. Unsupported characters in a dial string are  
ignored by the dialer.  
Digit Present (DPR)  
DPR is sent by the DTE to indicate to the dialer that the code  
on the Digit Signal Circuits can be read. Circuit DPR must not  
be turned on before Present Next Digit (PND) comes on. When  
DPR is on, it must remain on until PND goes off. When DPR  
is off, it must be held off until PND comes on again. If DPR is  
not turned on within five seconds after PND is turned on, the  
dialer assumes it has received the last digit and dials any digits  
that have been received. If no digits have been received, the  
dialer turns on Abandon Call and Retry (ACR) and waits for  
Call Request (CRQ) to drop.  
Present Next Digit (PND)  
PND is turned on by the dialer to indicate that it is ready to  
acceptthenextdigitonthedigitsignalcircuitsNB1, NB2, NB4,  
and NB8. Off indicates that the DTE should turn off DPR and  
set the states of NB1, NB2, NB4, and NB8 for the next digit.  
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EIA-366 Dialer Operation  
Abandon Call and Retry (ACR)  
ACR is supplied by the dialer to indicate that the call cannot  
be successfully established. The on condition instructs the  
DTE to abandon the call by dropping the call later. ACR  
remains on until CRQ is turned off.  
EXAMPLE DIAL SEQUENCE  
The following is an example of the sequence of events that  
occur when a call is initiated using the EIA-366A dialer port.  
• Data Line Occupied (DLO) must be off for the dial sequence  
to begin.  
• The DTE turns on Call Request (CRQ) to initiate dialing.  
• When CRQ is turned on, the dialer port turns on DLO to  
indicate that the data port is now in use. The dialer turns on  
Present Next Digit (PND) to request a dial digit from the  
DTE.  
• The DTE sets the digit signal circuit bits (NB1, NB2, NB4,  
and NB8) to the correct value for the first dial digit, then turns  
on Digit Present (DPR).  
• When DPR turns on, the dialer reads the digit and responds  
with another PND.  
• The PND/DPR sequence continues until either EON is  
received or five seconds expires without receiving another  
digit (DPR is not turned on to present another digit).  
• When all the digits are received, the dialer initiates the call  
on the data port to which the dialer is dedicated.  
• When the call is connected, Distant Station Connected (DSC)  
is turned on by the dialer port. If the call cannot complete  
successfully, Abandon Call and Retry (ACR) is turned on  
until CRQ is turned off.  
• The call can be terminated before the call is connected by  
turning CRQ off.  
• Once the call is completed, the call can be terminated by  
normal disconnect methodssuch asdisconnect bythe switch,  
the front panel, or DTR disconnect.  
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AT Command Operation  
Chapter 8  
AT Command Operation  
This chapter provides information on how to use AT  
commands to operate and configure the TA via a data port.  
The UTA220 AT command set is shown in Appendix C.  
AT COMMAND STATEMENT  
The TA communicates with a DTE asynchronously whenever  
the corresponding DTE port is configured for AT command  
mode. When the TA is powered up, any DTE port configured  
for AT commands enters command mode. AT commands can  
then be used to configure and control the TA. The command  
statement is typed using the DTE keyboard and temporarily  
resides in a section of memory called a buffer.  
The command statement must be written in a specific form so  
the TA recognizes and follows the instruction. The command  
statement begins with the letters AT and is followed by one or  
more commands, which can each consist of a sequence of  
keyboard symbols, such as & and %, letters, numbers, and is  
followed by a return or end-of-line character.  
AT Command Mode  
AT commands can only be issued when the DTE port is  
configured for AT command mode. Normally, the DTE port is  
in AT command mode whenever it is off-line. After the TA  
establishes a connection with another TA and goes into on-line  
data mode, characterssenttotheTAbytheDTEareinterpreted  
as data (not as commands) and are transmitted to the remote  
TA.  
If the DTE port is configured for DIALER CMDS = NONE,  
AT commands are not accepted in any mode.  
ESCAPE SEQUENCE: + + +  
If the TA is in asynchronous data mode, the escape sequence  
can be sent to return the TA to the command mode and remain  
on-line. The escape sequence consists of a pause (normally 1  
second), three escape characters, and then another pause. The  
default escape sequence characters are: + + +.  
The escape sequence character is set by the S2 command and  
can be changed. The escape sequence can also be disabled to  
prevent false escapes into command mode.  
After entering the escape sequence, the TA returns to AT  
command mode, but does not hang up or break the connection  
with the remote TA. AT commands can now be entered to the  
TA. The ATO command returns the TA to the data mode.  
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AT Command Operation  
CREATING A COMMAND STATEMENT: AT  
To create a command statement, use the following steps:  
1. Type AT, the attention code telling the unit a command  
statement follows.  
2. Type the command.  
3. Press the return key to “Enter” or send the command  
statement to the TA.  
An example of a command statement using the dial command  
(D) follows.  
ATD555-1212  
This statement can be read as: Attention: dial 555-1212.  
Anotherexample: EnterATZ. Thismeans “Attention:reset the  
TA and reload current configuration with stored values.”  
After entering a command line the TA returns a response  
message indicating whether the command was accepted, or by  
giving the data requested by the command line.  
The AT command also sets some of the TA’s DTE data  
parameters, such as DTE speed, parity, and bits per character  
to match the DTE. This process is repeated each time the AT  
prefix is typed.  
COMMAND STATEMENT GUIDELINES  
When typing command statements, the following rules apply:  
• Return must be pressed to execute (Enter) a command.  
• The command buffer can hold 128 characters including  
spaces.  
• Use the backspace or delete key to erase the last character.  
MONITOR DISPLAY  
As commands are typed they normally appear on the DTE  
monitor. This is called local character echo.  
DTE CHARACTER ECHO: E  
To determine if echo is set properly, type AT. If the terminal  
displays AT, echo is set correctly. If it displays AATT, then  
echo should be disabled by typing ATE. If the terminal does  
not display the AT at all, echo should be enabled by typing  
ATE1. The echo option only affects command mode operation.  
COMMAND STATEMENT BUFFER  
The TA temporarily stores up to 128 characters in a memory  
buffer. If more than 128 characters are entered before the end-  
of-line characters, the TA ceases to echo and waits for the end  
of line character. To correct this condition, retype the com-  
mand using 128 characters or less.  
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AT Command Operation  
The characters the AT command interpreter uses as end-of-  
line, line feed, and backspace are set respectively by the S3,  
S4, and S5 commands and can be changed.  
The punctuation used in telephone numbers takes up space in  
the buffer, as do blank characters used as spaces to help  
increase readability.  
BACKSPACE KEY  
Use the backspace key to change the command statement or  
correct errors. The backspace key allows the cursor to be  
moved back to the character(s)in error. Thecommandcanthen  
be retyped from that point.  
Example: ATD5551211 has been typed. To change the last 1  
to 2, press the backspace key once, type 2, and press return to  
execute the command.  
REPEATING A COMMAND: A/  
This command tells the TA to repeat the last command stored  
in its buffer. The command is automatically executed without  
any need to retype the command or press the return key.  
Example: The ATD5551212 command has been executed, and  
the phone is busy. To repeat the instruction type A/, but do not  
use AT before this command, as AT would empty the buffer  
and there would be no command to repeat.  
NUMBERED COMMANDS  
Series of commands starting with the same letter are  
distinguished by a number following the letter.  
For example, the E0 command selects echo off, and E1 selects  
echo on.  
GROUP COMMANDS  
A group of commands can be typed in a single statement.  
Pressing the RETURN key sends the entire command string to  
the TA, which executes each command, in the order it appears  
in the command statement, from left to right.  
For example, the command statement ATQ0V0D5551212  
means:  
• AT Attention  
• Q  
• V  
• D  
Allow status messages to be sent  
Select status  
Dial 555-1212  
The TA executes the AT command followed by the Q, V, and  
D commands. The TA returns the status message  
corresponding to the last command on the line. If an error is  
encountered in a command line, subsequent commands on the  
line are ignored.  
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AT Command Operation  
Some commands use special formats or have special rules  
concerning their use. For example, the dial D command  
initiates the dial process so no other commands, only dial  
modifiers, can follow the D command.  
COMMAND SCOPE  
The scope of a command refers to the extent of its effect on the  
TA. AT commands have a scope of Global, Channel, or Port.  
Global commands affect the operating characteristics of the  
TA as a whole, potentially disrupting operation on all of the  
ports and channels. Thus, a global command should be used  
with caution (or not at all) if there are currently active calls on  
any port.  
Channel commands affect only the operation of the B1, B2, or  
D-Channels of the TA. These commands should be used with  
caution if there are active calls on any port.  
Port commands affect only the operation of the particular DTE  
port in use. If the user is issuing a port command via DTE port  
1, then only DTE port 1 characteristics are affected. This rule  
does not apply if the user has entered Supervisor Command  
Mode (explained in the next section).  
Supervisor Command Mode  
The UTA220 is equipped with a feature called “AT Supervisor  
Command Mode.” This allows AT commands issued from one  
DTE port to be executed as if they were coming from another  
DTE port. This includes call placement and call control.  
To enter supervisor command mode, AT>Cn is entered, where  
n is the port to control. AT>C? can be entered to display which  
port is being controlled. To return to control of the DTE port  
to which you are connected, enter AT>C0 or AT>C.  
For example, a user may be connected to DTE port 3 and wants  
to control DTE port 1. The user enters AT>C1 at the DTE  
console. Now the user may operate as if he or she were  
connected to DTE port 1. All port commands issued from here  
on will affect DTE port 1 until the AT>C command is entered.  
In supervisor commandmode, when a call isplaced foranother  
DTE port, the controlled port enters the on-line mode while the  
supervisor port is still off-line. The supervisory port still has  
full control of the controlled DTE port. Connect messages are  
directed to the supervisor port in addition to the port being  
controlled.  
Caution: There is no mechanism to prevent a DTE port from  
being controlled by another DTE port. A DTE port can be  
controlled by more than one other DTE port.  
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Rate Adaption  
Chapter 9  
Rate Adaption  
To allow greater flexibility for your DTE, three rate adaption  
protocols are available for use on the B-channel: T-Link,  
V.120, and Bonding (see Chapter 10 for a description of  
Bonding). These protocols allow your DTE to operate both  
synchronously and asynchronously, and at a different speed  
than the B-channel.  
RATE ADAPTION  
When a data call is placed, the TA tries to establish physical  
data connection on the ISDN B-channel. The B-channel is a  
digital channel that can transfer data at 56 or 64 kbps,  
depending on the path the network chooses when routing the  
call.  
A rate adaption protocol is necessary if the user’s DTE rate is  
other than 56 or 64 kbps. The protocol adapts the lower speed  
of the DTE to the higher speed of the ISDN B-channel. The  
LCD menu or the AT%A2 command can be used to select a  
rate adaption protocol.  
This chapter discusses two rate adaption protocols: TLink and  
V.120.  
• T-Link does not guarantee error free data; it only adapts the  
lower DTE speed to the higher ISDN speed to a maximum  
of 19.2 kbps asynchronous and 64 kbps synchronous.  
• V.120 is an error-controlling protocol that guarantees error  
free data transfer at speeds up to 128 kbps. (Throughput is  
limited by the B-Channel to about 70 kbps.)  
T-LINK  
T-Link is a Northern Telecom proprietary rate adaption  
protocol. It supports synchronous and asynchronous rate  
adaption at a variety of speeds.  
To select T-Link with the LCD, scroll through the menu and  
select:  
• CONFIGURATION OPTIONS?  
• PORT CONFIG OPTIONS?  
• PROTOCOL OPTIONS?  
• PROTOCOL = T-LINK  
To select T-Link with the AT%A2 command, enter  
AT%A2=1.  
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Rate Adaption  
When using a rate adaption protocol, both the calling and  
called units must use the same protocol. Also, unless the TA  
is configured for T-Link “adaptive mode,” the DTEs on both  
ends must be set to the same DTE speed before data can be  
transferred. In the adaptive mode, the TA can adjust its speed  
automatically to match the remote unit. To use this mode,  
however, the DTE must also be able to change its speed  
according to the connect speed of the TA, as indicated by the  
rate in the connect message.  
Flow Control and Pin Options  
When using T-Link the flow control option for the DTE port  
is overridden. In addition the RTS, CTS, and DTR pin options  
are overridden. The T-Link protocol itself defines the way  
these pins are handled.  
T-Link transmits the state of the RTS pin to the remote TA  
where it is transmitted back as the CTS state. DTR is mapped  
to the remote end as DSR, but it is not looped back.  
T-Link Options  
Fixed/Adaptive:  
• In fixed mode, the TA will not negotiate setup. If the other  
TA is not set to the same speed the negotiation will fail.  
• In adaptive mode, the called TA will be asked to adapt to the  
originator’s parameters. If the called TA is set for fixed mode  
and its parameters don't match the originator’s, the called TA  
will request that the originator adapt to it.  
RTS Assert/Normal:  
• In RTS assert mode, T-Link operates as if RTS is always  
asserted  
• In RTS normal mode, T-Link passes the state of the RTS pin  
to the remote TA  
DTR Assert/Normal:  
• In DTR assert mode, T-Link operates as if DTR is always  
asserted  
• In DTR normal mode, T-Link passes the state of the DTR pin  
to the remote TA  
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Rate Adaption  
V.120  
V.120 is a CCITT protocol that supports synchronous and  
asynchronous rate adaption, and also provides link-layer error  
control. Although errors on a digital network are rarer than on  
an analog telephone line, they are possible. V.120 provides an  
end-to-end protocol for detecting and correcting any such  
errors. V.120 also performs buffering and can thus support  
flow control to and from the DTE.  
To select V.120 with the LCD, scroll through the menu and  
select:  
• CONFIGURATION OPTIONS?  
• PORT CONFIG OPTIONS?  
• PROTOCOL OPTIONS?  
• PROTOCOL = V.120  
To select V.120 with the AT%A2 command, enter AT%A2=2.  
V.120 Options  
Maximum Transmit Frame Size is the maximum size a frame  
can be for transmitting. The transmit frame size affects the  
store-and-forward delay.  
Maximum Receive Frame Size is the maximum size frame that  
is accepted by the TA. Larger frames are rejected.  
Window Size is the number of frames that can be sent before  
an acknowledgment is received. This parameter is normally  
not changed.  
T200 Timer is the length of time to wait for acknowledgment  
of a sent frame. If this timer expires, V.120 attempts to send  
the frame again.  
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BONDING  
Chapter 10  
BONDING  
BONDINGisanew protocol standardfrom theBandwidthON  
Demand INteroperability Group for combining the bandwidth  
of several 56 kbps or 64 kbps channels. BONDING can ‘bond’  
from 2 to 31 channels at once. The high speed data, which must  
be a multiple of 56 kbps or 64 kbps, is split after arrival at the  
DTE interface into the various channels. On the opposite end  
the data is recombined into the original data stream and sent to  
the DTE interface.  
BONDING ON THE UTA220  
Because the UTA220 supports one ISDN basic rate interface  
(2B+D), two simultaneous calls can be made, allowing an  
effective bandwidth of 112 kbps or 128 kbps. The BONDING  
call can be made from port 1 or port 2. Table 10-1 lists  
BONDING call options.  
Table 10-1: BONDING Options  
Option  
Select  
CONFIGURATION /  
PORT /  
Bond  
PROTOCOL  
CONFIGURATION /  
PORT /  
Set to 2 in order to request a 112 kbps or 128 kbps call.  
Set to 1 in order to request a 56 kbps or 64 kbps call.  
BONDING OPTIONS /  
RATE MULTIPLR  
Note: To run 56 kbps or 64 kbps, it is simpler to use  
clear channel transfer (select PROTOCOL: NONE). If  
you request a rate multiplier of one, it will negotiate  
parameters according to the BONDING specification  
at the start of the call and then switch to a 56 kbps or  
64 kbps clear channel call.  
CONFIGURATION /  
PORT /  
BONDING OPTIONS /  
SEC CALL PORT  
This option is needed only for AT&T 5E5/5E6 lines. If  
configured for multiple call references, set port 1 to 1  
and port 2 to 2. This will cause the second call to use  
the same directory number as the first. If the line is not  
configured for multiple call references and the BOND-  
ING call is being placed on port 1, set both port 1 and  
port 2 to 2 (this is the default). If placing the BONDING  
call on port 2, set both port 1 and port 2 to 1. This will  
cause both directory numbers to be used for the two  
channel BONDING call.  
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BONDING  
PLACING A BONDING CALL  
You can place a call from port 1 or port 2 using any normal  
means. The answering party must be set to run BONDING or  
the call will disconnect shortly after connection. If you specify  
a rate multiplier of 2 and the answering party indicates it will  
support 2 or more channels for BONDING, the answering side  
will pass the directory number for the second call in the  
negotiation. The second call is made automatically. You can  
tell this call is being made by the flashing LED on the second  
B-channel. If delay equalization between the channels is  
obtained, data mode is entered. The front panel indicates the  
BONDING connection, the B-channel line speed (56 or 64  
kbps), and the DTE speed (56, 64, 112, or 128 kbps). The  
B-channel LEDs remain on when data mode has been entered.  
Note: When a rate multiple of 2 is negotiated, both B-channels  
are used. The remaining ports are prevented from making  
circuit switched calls for the duration of the BONDING call.  
If the rate multiple is set to 1 on either the originator or  
answerer, the second call will not be made and data mode will  
be entered immediately after negotiation. The second call will  
not be made and data mode will be entered immediately after  
negotiation. The screen will indicate the speed the call  
connected at.  
The Directory Numbers configured in the D-channel setup tell  
the origination side what the second Directory Number is. If  
you are using a point-to-point line with only one Directory  
Number, on answering a BONDING call that is requesting two  
channels, this directory number will be sent to the origination  
side, which is the same number as the first one dialed. This is  
because a point-to-point line can receive two calls using the  
same Directory Number. AT&T 5E5/5E6 can also be  
configured to receive two calls using the same Directory  
Number. To use this capability, change port 1’s SEC CALL  
PORT (located under BONDING OPTIONS in  
CONFIGURATION / PORT) to 1 and set port 2’s SEC CALL  
PORT to 2.  
DISCONNECTING A BONDING CALL  
Disconnecting by any normal means disconnects all  
BONDING channels. If either channel is disconnected by the  
switch, the entire call is disconnected by the UTA220. The  
disconnection can be validated by the LCD screen indicating  
DISCONNECTED and the B1 and B2 LEDs being off.  
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Synchronous Operation  
Chapter 11  
Synchronous Operation  
SYNCHRONOUS MODES  
The UTA220 supports two synchronous modes. Operation in  
each of these modes is described below.  
Synchronous Mode 1: Sync Pause Mode  
When a telephone connection is made, the UTA220 delays for 5  
seconds (configurable with the S25 command ’0’) before  
monitoring DTR.  
This delay serves two purposes. If separate dialing and  
communication terminals are used, this allows the terminal  
operator toswitch the EIA-232 cable betweenthe two. If separate  
dialing and communications software is being used on the same  
terminal, the delay allows time for the dialing software to  
complete and the communications software to initialize and turn  
DTR on.  
After the UTA220 connects, the DSR, CD, and CTS pins will be  
high. This can be used by the DTE as an indication that it can  
begin sending synchronous data to the UTA220.  
The UTA220 disconnects if it detects an on-to-off transition of  
the DTR pin when &D0 isnot ineffect, or it receivesa disconnect  
message from the switch. After a disconnect, the UTA220  
returns to the off-line state. If the UTA220 is set to auto answer,  
it will only answer when DTR is on or &D0 is in effect. If you  
do not want the UTA220 to answer, DTR must remain low for  
at least 8 seconds after the ringing ends.  
Synchronous Mode 2: Dial Stored Number Mode  
The UTA220 will automatically dial the telephone number  
stored in directory entry number 0 when it detects and  
off-to-on transition of the DTR pin.  
Once the UTA220 connects, the DSR, CD, and CTS pins will be  
high to indicate to the DTE that it can begin sending synchronous  
data.  
The UTA220 disconnects upon detecting an on-to-off transition  
of the DTR pin when &D0 is not in effect, or receiving a  
disconnect message from the switch. After disconnecting, the  
UTA220 hangs up and returns to the  
off-line state.  
If the UTA220 is set to auto answer, it will only answer when  
DTR is on or &D0 is in effect. If you do not want the UTA220  
to answer, DTR must remain low for at least 8 seconds after the  
ringing ends. After that time, DTR going high will cause the  
UTA220 to originate a call. If DTR goes high during the ringing  
process, but before the required ring count is reached, the  
UTA220 will not originate a call.  
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D-Channel X.25  
Chapter 12  
D-Channel X.25  
The TA provides the 1984 CCITT specified X.25 protocol for  
the D-channel with a Packet Assembler/ Disassembler (PAD)  
interface for asynchronous data terminals. The X.25 protocol  
supports the following X.25 parameters:  
• Single channel operation  
• Modulo 8  
• Transmit packet size maximum of 256 byte  
• Receive packet size maximum of 256 bytes  
• Link level window size maximum of 7  
• Packet level window size maximum of 7  
FUNCTIONAL DESCRIPTION  
X.25  
X.25 is a synchronous error-correcting protocol for data  
transmission over public and private networks. The X.25  
protocolissubdivided into three layers: physical, data link, and  
packet (or network). Each layer isresponsible for specific parts  
of the data transmission, error checking, and error correcting.  
Data is transmitted in packets that contain additional  
information to facilitate the error checking and correcting.  
PAD  
The PAD acts as an intermediary between the local user's  
asynchronous terminal and the X.25 protocol. PAD functions  
are specified by CCITT X.3, X.28, and X.29  
recommendations. These recommendations are as follows:  
• X.3 defines 22 PAD parameters that govern how the PAD  
operates. These parameters specify how and when the data  
from the asynchronous DTE is forwarded to the remote host  
(assembly) and how the data from the remote host displays  
to the asynchronous terminal (disassembly).  
• X.28 defines the PAD commands and responses that permit  
communication with the X.25 protocol via an asynchronous  
terminal.  
• X.29 defines supervisory packets used for communication  
between the local PAD and the remote host's PAD.  
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D-Channel X.25  
ESTABLISHING AN X.25 SESSION  
Before using the TA for X.25 communications on the  
D-channel, the user must subscribe to the ISDN D-packet  
service. If the user is subscribed to the D-packet service, a  
connection is automatically established between the TA and  
the ISDN packet handler when the TA is first powered up. This  
is known as the D-channel X.25 link connection. Once the TA  
is connected to the ISDN packet handler, the X.25 PAD is used  
to make an X.25 virtual connection to a specific remote host  
or device. The connection is called “virtual” because it is not  
a direct physical connection; a transmission path is created for  
each call and held until communications are completed and the  
connection is disconnected.  
The following explains how an X.25 virtual connection  
(session) is established and disconnected, as well as some of  
the activities performed during the X.25 session.  
Initialize the PAD  
When the TA is first powered up, the TA is in the AT command  
mode. There are three AT commands that the TA supports to  
initialize the PAD:  
ATDD  
AT@P1 = P  
AT@P1 = D  
Once the PAD is initialized, the PAD prompt character *  
displays and the PAD is in the PAD command mode.  
ATDD Command  
The ATDD command is valid for initializing the PAD only  
when the D-channel X.25 link is established. If the ATDD  
command is entered when the D-channel X.25 link is not  
established, the TA responds with ERROR and remains in the  
AT command mode.  
AT@P1=P or AT@P1=D Command  
The AT@P1=P or AT@P1=D command initializes the PAD  
automatically when the TA is powered up. If the D-channel  
X.25 link is not established when the TA is powered up, the  
PAD is initialized to the PAD command mode. Likewise, if  
the D-channel link is connected when the TA is powered up,  
the PAD is initialized to the PAD command mode, just as  
though an ATDD had been executed.  
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D-Channel X.25  
Note: The AT@P1=P and AT@P1=D commands do not take  
effect until the TA power is cycled or the TA is restarted. The  
AT&W command must be executed to save all port parameters.  
Establishing an X.25 Virtual Connection  
There are three modes of operation for the PAD:  
• Command mode  
• Connect-in-progress mode  
• Data transfer mode  
Initially, the PAD is in the PAD command mode where PAD  
commands can be executed and an X.25 virtual connection can  
be established if the D-channel X.25 link is connected.  
An X.25 virtual call can be established by initiating the PAD  
select command containing the desired requested facilities  
and/or Network User Address (NUA).  
Refer to the PAD COMMAND SET section for the rules  
governing the format of the PAD select command. The  
facilities permit the user to request special services from the  
ISDN network at call-setup time. The NUA informs the ISDN  
packet handler of the remote location address the user is  
requesting for connection through the ISDN network.  
Example: R-12345678  
Thiscommandrequestsreversechargingand directsthevirtual  
call to the NUA 12345678.  
During establishment of the X.25 virtual call connection, the  
PAD is in the connect-in-progress mode. When the virtual call  
is established, the following message displays:  
COM  
The PAD is now in the data transfer mode and data exchange  
can begin.  
Note: Data is transmitted through the PAD that is packeting  
the data. Echo of PAD data and PAD commands is performed  
locally by the PAD.  
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D-Channel X.25  
Escaping to PAD Command Mode  
When in data transfer mode or connect-in-progress mode, it is  
possible to escape to the PAD command mode to execute a  
PAD command. To escape to the PAD command mode issue  
the PAD recall character as specified by X.3 parameter 1. The  
default PAD recall character for the TA is DLE (Ctrl P).  
Once in the PAD command mode, the PAD prompt character  
* displays and only one PAD command may be executed.  
Upon execution of the PAD command, the PAD returns either  
to the previous mode of the PAD (i.e., data transfer) or to the  
final mode required by the execution of the PAD command  
(i.e., afterexecutionofthePADclearcommand, thefinalmode  
is the PAD command mode).  
Escaping to AT Command Mode  
To escape to the AT command mode from PAD data or  
command mode, enter the AT escape command (+ + +). This  
temporarily suspends PAD operations and follows standard is  
AT command function operation. To return to PAD operation  
enter:  
ATDD  
To end the call and exit the PAD enter:  
ATH  
To save the port and current session configuration, including  
the current PAD parameter configuration, to nonvolatile  
memory enter:  
AT&W  
Disconnecting the X.25 Virtual Connection  
The X.25 virtual call connection is disconnected by issuing the  
PAD Clear command while in the PAD command mode.  
Example: *CLR  
This disconnects the virtual call but leaves the terminal adapter  
on-line and in the PAD command mode.  
When the virtual call is disconnected, the PAD Clear  
Confirmed response and PAD prompt character are displayed:  
CLR CONF  
*
The PAD is now in the PAD command mode where another  
X.25 virtual connection can be established via the PAD Select  
command.  
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D-Channel X.25  
COMMON APPARENT PROBLEMS  
During a session the X.25 network or remote PAD can alter  
the current values of the X.3 parameters resulting in common  
apparent problems.  
Parameter 1 Changed  
PAD recall using the character DLE (Ctrl P) is no longer  
possible.  
Parameter 2 Changed  
Characters are no longer echoed when in the PAD command  
mode.  
Parameter 5 Changed  
Flow control characters are sent to the DTE by the PAD during  
the PAD command mode.  
Parameter 6 Changed  
The PAD prompt no longer appears when in the PAD  
command mode.  
Parameter 20 Changed  
Editing characters are echoed.  
PAD COMMAND SET  
The X.25 PAD serves as an asynchronous interface through  
which the X.25 protocol and PAD operation can be controlled.  
PAD commands are specified in X.28 by CCITT which allow  
for communication directly with the PAD. Some of the X.28  
PAD commands control the X.25 protocol operation such as  
call setup, call clearing, etc. The rest of the PAD commands  
provide access to the X.3 PAD parameters for PAD operation  
control (refer to the X.3 Parameters and Values section).  
PAD Command Format  
The format of each PAD command is described in the section  
below. The PAD accepts either upper or lowercase characters  
for the PAD command characters. Any spaces inserted in the  
PAD command are ignored except for spaces in the call user  
data of the PAD select command (see PAD select command).  
A PAD command line can contain up to 128 characters.  
Multiple PAD commands are not permitted on a command  
line.  
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D-Channel X.25  
Issuing PAD Commands  
PAD commands are accepted by the PAD only when it is in  
PAD command mode (when a PAD prompt character *  
displays at the beginning of the command line). As each PAD  
commandcharacteristyped, thecharacterisechoedtothelocal  
DTE device for display, unless echoing is disabled by X.3  
parameter 2.  
Each PAD command is input to the PAD by typing the PAD  
command delimiter character (a carriage return or + character)  
at the end of the command line. The PAD commands can be  
edited, unlesseditingisdisabled by X.3 parameter 15, anytime  
before the command is input to the PAD. Once the PAD has  
executed the command, a response, called a PAD service  
signal, is returned to the DTE to inform the user of the result  
of the command execution.  
Note: An incorrect PAD format will cause an ERR response.  
Status: STAT  
Clear: CLR  
This command requests the virtual call status of the local DTE.  
Response:  
ENGAGED - Indicates the local DTE is currently engaged in  
a virtual call.  
FREE - Indicates the local DTE is not engaged in a virtual call.  
The clear command disconnects the virtual call connection.  
Response:  
CLR CONF - Confirms that the clear command was accepted  
by the packet handler and the current virtual call was  
disconnected.  
CLR ERR - Indicates that the clear command was in error  
because a virtual call was not established, or that the PAD is  
in an unknown mode and cannot accept the clear command.  
CLR DER - Indicates that the remote end is no longer  
responding because no response to the clear or additional  
retransmission of the clear was received.  
RESET  
This command resets the current virtual call. When resetting  
the call, the packet sequence counters P(r) and P(s) and the  
packet window are reset to 0. Outstanding data or data stored  
from the local DTE is discarded. The reset returns the current  
virtual call to a known mode (the same mode the virtual call  
was in when it was first established). This command is only  
valid when a virtual call is connected.  
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D-Channel X.25  
Note: The CR LF characters indicate a carriage return and  
line feed response and are not actually displayed.  
Response:  
CR LF - Indicates the reset of the virtual call is complete.  
ERR - Indicates a reset command error caused by either a  
virtual call not being established or the PAD being in a mode  
unknown to the user.  
Interrupt: INT  
This command initiates the transmission of an interrupt packet  
to the remote DTE. This command is only valid when a call is  
connected.  
Response:  
CR LF - Indicates that the interrupt packet was transmitted.  
ERR - Indicates an interrupt command error caused by a  
virtual call not being established or the PAD being in a mode  
unknown to the user.  
SET  
This command sets or changes the value of one or more X.3  
parameters.  
A colon must be placed between the parameter and its  
corresponding value. If more than one parameter is requested  
to be set or changed, a comma must delimit the value and the  
next parameter.  
SET <parameter>:<value>,<parameter>:  
<value>,...  
Note: Refer to Table 6 for a list of X.3 parameters and their  
corresponding default values.  
Response:  
CR LF - Indicates that the parameter specified in the set  
command is set to its corresponding specified value.  
PAR <parameter>: INV - Indicates that the specified  
parameter is incorrect or cannot be changed because it is a  
READ ONLY parameter (i.e., parameter 11 is a READ ONLY  
parameter), or the value specified in the set command is an  
invalid value for the specified parameter.  
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D-Channel X.25  
Read: PAR?  
This command requests a display of the current values of the  
specified X.3 parameter(s).  
If more than one parameter is specified, each must be delimited  
by a comma. If none are specified, all parameters (1 - 22) and  
their corresponding values are displayed.  
PAR? <parameter>,<parameter>,...  
or  
PAR?  
Response:  
PAR <parameter>:<value>,<parameter>: <value>, ... -  
Lists each parameter specified by the read command and the  
corresponding value.  
PAR <parameter>: INV - Indicates the invalid parameter  
specified in the read command.  
Set and Read: SET?  
These commands request the setting or changing of the current  
values of the specified X.3 parameters and display the values  
after the setting or changing.  
A colon must be placed between the specified parameter and  
its corresponding specified value. If more than one parameter  
is requested to be set or changed, a comma must delimit the  
value and the next parameter reference.  
SET? <parameter>:<value>, <parameter>:  
<value,.>...  
Response:  
PAR <parameter>: <value>, <parameter>: <value>... -  
Lists each parameter specified by the set and read command  
and the corresponding value.  
PAR <parameter>: INV - Indicates the specified parameter  
is incorrect or cannot be changed because it is a READ ONLY  
parameter, or the value specified in the set and read command  
is an invalid value for the specified parameter.  
Remote Read: RPAR?  
The read command requests a display of the current values of  
the specified X.3 parameter(s) from the remote PAD. This is  
only valid if an X.25 call is active.  
If more than one parameter is specified, each must be delimited  
by a comma (,). If none are specified, all parameters (1-22) and  
their corresponding values are displayed.  
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D-Channel X.25  
RPAR? <parameter>,<parameter>,...  
or  
RPAR?  
Response:  
PAR <parameter>:<value>,<parameter>:<value>,... - Lists  
each parameter specified by the read command and the  
corresponding value.  
PAR <parameter>: INV - Indicates the invalid parameter  
specified in the read command.  
Remote Set and Read: RSET?  
These commands request, from a remote PAD, the setting or  
changing of the current values of the specified X.3 parameters  
and display the values after the setting or changing from the  
remote PAD. This is only valid if an X.25 call is active.  
A colon must be placed between the specified parameter and  
its corresponding specified value. If more than one parameter  
is requested to be set or changed, a comma must delimit the  
value and the next parameter reference.  
RSET? <parameter>:<value>,  
<parameter>:<value>,...  
Response:  
PAR <parameter>:<value>,<parameter>:<value>,...-- Lists  
each parameter specified by the set and read command and the  
corresponding value.  
PAR <parameter>: INV--Indicates the specified parameter  
is incorrect or cannot be changed because it is a READ ONLY  
parameter (i.e., parameter 11 is a READ ONLY parameter), or  
the value specified in the set and read command is an invalid  
value for the specified parameter.  
Profile Read/Save: PROF  
These commands allow the user to load a saved, default, or  
standard set of X.3 parameters from non-volatile memory or  
save the X.3 parameters to one of two user profiles in  
non-volatile memory. The PROF command syntax is as  
follows:  
PROF 90, PROF SIM: Will load the CCITT simple standard  
profile.  
PROF 91, PROF TRA: Will load the CCITT transparent  
standard profile.  
PROF NVM #(0,1): Will load from one of two specified  
non-volatile memories a profile stored by the user.  
PROF SAV #(0,1): Will store the current X.3 profile into one  
of two non-volatile memories as specified.  
PROF DEF: Will load the factory default X.3 profile.  
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D-Channel X.25  
PAD Select  
This command establishes an X.25 virtual call connection  
through the ISDN packet handler to a remote host or device.  
The contents of the PAD select command determine the  
contents of the X.25 Call Request packet. The format can be  
in any of following three forms:  
<facility request block> - <address block> <call  
user data>  
<facility request block> - <call user data>  
<address block> <call user data>  
The facility request block permits the user to request special  
services from the ISDN network. If more than one facility is  
specified, a comma must separate each facility. The end of the  
facility request block must be followed by the hyphen  
character.  
The address block specifies the called Network User Address  
(NUA). The address cannot exceed 15 characters in length.  
Abbreviated or multiple addresses are not supported.  
The call user data field cannot exceed 12 characters in length  
(including spaces) and must be preceded by either the P or D  
character. Carriage returns and the + character are not  
considered part of the user data field because they are treated  
as PAD command delimiters.  
Response:  
COM - Indicates the virtual call is established.  
ERR - Indicates the PAD is in an unknown mode that cannot  
allow the PAD select command, the PAD has been initialized  
in the off-line mode (i.e., no virtual call connection has been  
established), or the PAD select command is invalid due to a  
format error. Some PAD select format errors are as follows:  
• The facilities block is not followed by the - character.  
• The CUG facility is requested and two decimal digits are not  
specified.  
• The RPOA facility is requested and four decimal digits are  
not specified.  
• The address block length exceeded 15 characters.  
• The call user data block is not preceded by the P or D  
character.  
• The call user data block length exceeded 12 characters.  
• An invalid facility is requested as the first facility in the  
facility request block.  
CLR xxx - Indicates the attempted call has cleared. The xxx  
is the ASCII character cause code which specifies the reason  
the call attempt cleared (see PAD Clear Service Signals).  
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D-Channel X.25  
FACILITIES  
The following facilities and corresponding code formats are  
supported by the TA.  
Reverse Charging: R  
Reverse Charging is a facility analogous to “collect” calls. All  
connect charges are charged to the remote DTE. This facility  
works in conjunction with the Reverse Charging Acceptance  
facility. If the remote DTE does not subscribe to Reverse  
Charging Acceptance, the local DTE's call with the reverse  
charging request is cleared.  
Format: R  
Network User Identification (NUI)  
This facility provides a way for the user to be identified by the  
network for the purpose of billing, security, or network  
management.  
Format: N <NUI string>  
A character string of up to 16 decimal characters from 33 to  
126 of the ASCII character table (see Appendix F) except for  
characters 43 to 45 (hyphen, comma, and plus sign). Spaces  
can be included in the specification of the NUI string but are  
discarded by the PAD.  
Echo to the local DTE is turned off upon entering the N until  
a comma or hyphen is entered. The comma signifies the end  
of the NUI string and indicates that more facilities are to  
follow. The hyphen signifies the ending of the facility block.  
The P or D designator used for the beginning of the user data  
call does not end the NUI string because it is considered a valid  
NUI string character.  
Closed User Group (CUG)  
The Closed User Group (CUG) facility permits users to  
essentially establish a private network on a public network by  
restricting communications to only those who are designated  
to be in the group. Access by anyone outside the group is  
denied. The CUG number is assigned by the network provider  
at subscription time.  
Format: G <xx>  
<xx>: two decimal digits ranging from 00 - 99. If two decimal  
digits are not specified, the response ERR displays.  
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D-Channel X.25  
Recognized Private Operating Agency  
The Recognized Private Operating Agency (RPOA) facility  
permits the user to specify the particular international gateway  
to be used when initiating an international virtual call.  
Format: T <xxxx>  
<xxxx>: four decimal digits  
If four decimal digits are not specified, the response ERR  
displays.  
Flow Control Parameter Negotiation  
This facility permits the negotiation on a per-call basis of the  
packet and window sizes (flow control parameters) for each  
direction of transmission. The packet size designates the  
maximum data field length of the data packets. The window  
size designates the number of data packets that may be sent  
before acknowledgment of the received packets (i.e.,  
permission to transmit more data packets) is received. Window  
sizes do not have to be the same at both ends of the virtual  
connection.  
The TA cannot initiate negotiation of this facility, but will  
respond to negotiation from the network. The packet window  
size is changed by using the AT command !X0 (receive  
window size), !X1 (transmit window size) for the D-Channel  
or %D0 (receive window size), %D1 (transmit size) for an  
X.25 configured port (see AT commands).  
If the window size is not the default value of two, the specified  
window size value is requested in the call request packet when  
the virtual call is being established. The default packet size  
supported by the TA is 128 bytes and can be changed using the  
AT commands !X2 (receive packet size), !X3 (transmit packet  
size), for the D-Channel or %D2 (receive packet size), %D3  
(transmit packet size) for an X.25 configured port.  
To allow maximum flexibility, the user may configure various  
parameters, such as packet size, window size, call type/LCN  
ranges, and packet modulus, for the D-Channel, Port, or  
Session (session not yet implemented) differently for each  
X.25 call.  
The rules to determine the parameters used areas follows:  
• If a session parameter (window or packet) is non-zero, the  
session parameter is used.  
• If the session parameter is zero and the port parameter is  
non-zero, the port parameter is used.  
• If the session and port parameters are zero, the D-Channel  
parameter is used.  
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D-Channel X.25  
Table 12-1: PAD Command Set Summary  
Command  
Description  
Response  
ENGAGED or FREE  
STAT  
Requests virtual call status of  
the DTE  
CLR  
RESET  
INT  
Disconnects the current virtual CLR CONF, CLR ERR, or CLR  
call  
DER  
Resets the current virtual call  
Acknowledgment PAD service  
signal or ERR *  
Transmits an interrupt packet  
Acknowledgment PAD service  
signal or ERR *  
SET  
Sets or changes the value of  
one or more of the current  
parameters  
Acknowledgment PAD service  
signal or ERR or PAR (list of  
specified parameters and INV)  
*
PAR?  
SET?  
Requests display of the current PAR (list of specified  
values of the specified  
parameters  
parameters with their current  
values or INV)  
Requests the setting or  
PAR (list of specified  
changing of the current values parameters with their current  
of the specified parameters  
and display the values after the  
setting or changing  
values or INV) or ERR  
RPAR?  
RSET?  
Requests the display from the PAR (list of specified  
remote PAD of the current  
values of the specified  
parameters  
parameters with their current  
values or INV)  
Requests the setting or  
PAR (list of specified  
changing from the remote PAD parameters with their current  
of the current values of the  
specified parameters and  
displays the values after the  
setting or changing  
values or INV) or ERR  
PROF  
Loads or Storesthe current X.3 Acknowledgment PAD service  
profile  
signal or ERR*  
PAD Select Sets up and establishes a  
Command virtual call  
COMM, ERR, or CLR xxx (see  
PAD Clear Service Signals)  
*Acknowledgment PAD service signal is transmitted to the local DTE as a carriage return and a  
line feed.  
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D-Channel X.25  
PAD SERVICE SIGNALS  
The local DTE may receive service signals from the PAD in  
response toanissued PADcommandor asthe result of apacket  
or network action. Table 12-2 shows the service signals that  
may be transmitted to the local DTE by the PAD.  
Table 12-2: PAD Service Signals  
Command  
Extension  
Reason  
*
PAD is in the PAD command state and the  
user can issue a PAD command  
ENGAGED  
FREE  
Response to PAD STATus command  
Response to PAD STATus command  
PAR  
Parameter:  
value or  
Parameter: INV  
Response to set PAD command if one of the  
parameters to be set is invalid or response to  
set and read command or read command  
ERR  
PAD command is in error  
RESET  
See PAD Reset  
Service Signals  
Resetting by the network or remote DTE  
CLR  
CLR  
CLR  
See PAD Clear  
Service Signals  
Clearing by the network or remote DTE  
CONF  
Confirmation of clearing either initiated by the  
CLR PAD command or by the packet  
DER  
Restart on the network link or response to  
packet virtual call request when the call  
cannot be established  
COM  
Call connected in response to a PAD Select  
command or the receipt of an incoming call  
(connection based upon acceptance of  
incoming call by the packet)  
XXX  
\
Line delete function performed for a printing  
terminal  
Character delete function performed for a  
printing terminal  
BS SP  
BS  
Character delete function performed for a  
display terminal  
CR LF  
Acknowledgment of a PAD command such  
as RESET or INT  
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D-Channel X.25  
PAD Reset Service Signals  
A reset service signal is transmitted to the local DTE when  
resetting is initiated by the network or remote DTE. The reset  
cause code issued with the reset request packet from the  
network or local DTE indicates the reason. The reset cause  
code is interpreted by the PAD and the resultant cause code  
service signal extension is transmitted to the local DTE with  
theRESETservicesignal. Thefollowingisalistofthepossible  
reset service signals that may be transmitted to the local DTE  
by the PAD.  
Table 12-3: PAD Reset Service Signals  
Service  
Signal  
Reason  
RESET DTE Reset by remote DTE  
RESET  
ERR  
Reset due to a local procedure error  
RESET NC Reset due to network congestion  
RESET RPE Reset due to a remote DTE procedure  
Pad Clear Service Signals  
A clear service signal is transmitted to the local DTE when  
clearing is initiated by the network or remote DTE. The clear  
cause code issued with the clear request packet from the  
network or local DTE indicates the reason for the clearing. The  
clear cause code is interpreted by the PAD and the resultant  
cause code service signal extension is transmitted to the local  
DTE with the CLR service signal. Table 12-4 shows the clear  
service signals that may be transmitted to the local DTE by the  
PAD.  
Table 12-4: PAD Clear Service Signals  
Service  
Signal  
Reason  
CLR OCC  
DTE is engaged in another call and cannot accept the incoming  
call  
CLR NC  
Network problem exists which prevents the network from  
handling the call  
CLR INV  
CLR NA  
DTE requested an invalid facility  
DTE to DTE connection not allowed. For example, if the closed  
user group was not the same the connection would not be allowed  
CLR ERR  
Clearing error caused by the local DTE detected by the PAD  
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D-Channel X.25  
Table 12-4: PAD Clear Service Signals (Continued)  
CLR RPE  
Remote DTE procedure error detected by the remote DTE/DCE  
interface  
CLR NP  
CLR DER  
CLR DTE  
CLR RNA  
Called DTE address not assigned to any DTE  
Called number out of order or not responding  
Remote DTE cleared the call  
Called DTE not subscribed to reverse charging acceptance,  
allowing the called DTE to accept the calling DTE’s request for  
reverse charging (the reverse charge facility in the facility request  
field of the call request packet)  
X.3 PARAMETERS AND VALUES  
Just as the AT commands control some of the operating  
features of the TA, the X.3 parameters control the PAD’s  
operating features. These parameters are user configurable and  
remote configurable: the remote device can change the local  
PAD parameters to designate how the PAD handles the data.  
Most X.3 parameters govern how the data displays because the  
data display depends on the type of local DTE or application.  
Other X.3 parameters govern PAD functions such as data  
forwarding (when to stop packeting the data received from the  
local DTE device and transmit the packet), editing, flow  
control, and service signal control.  
Saving the X.3 Parameter Configuration  
When the TA is first powered up, the X.3 parameters are set  
to the default (factory) settings (Table 12-5). PAD parameters  
can be modified using the set or set and read PAD commands.  
The PAD must be in the PAD command mode before the set  
or set and read commands can be executed. During a virtual  
call, the remote device can change the X.3 parameter  
configuration from the user's set configuration. To avoid the  
problems this may cause, the PAD saves the current settings  
of the X.3 parameters to RAM an X.25 virtual call is initiated.  
When the virtual call is disconnected, the saved X.3 parameter  
settings are restored. The PAD does not save the current X.3  
parameter settings when the virtual call connection is  
established by the remote DTE.  
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Table 12-5: Default X.3 Parameters  
Parameter  
Description  
Default  
Remarks  
1
PAD recall using a  
character  
1
DLE character (Ctrl P) is the  
PAD recall character  
2
3
Echo  
1
2
Enabled  
Data forwarding  
character selection  
Carriage return character  
(0Dh) is the data forwarding  
character  
4
5
Idle timer delay  
selection  
0
2
Timer = 0 secs  
Ancillary device  
control  
Flow control of local DTE  
device by PAD allowed in data  
transfer  
6
7
Control of PAD  
service and  
5
0
Transmit PAD command and  
service signals in standard  
form  
command signals  
Action of PAD on  
break from DTE  
Do Nothing  
8
9
Discard output  
0
0
Normal data delivery  
Padding after  
carriage return  
No padding after carriage  
return  
10  
11  
Line folding  
0
-
No line folding  
Binary speed of  
DTE  
Set by current baud rate  
12  
13  
Flow control of  
PAD by DTE  
1
5
DTE flow control of PAD  
allowed  
Line feed insertion  
after carriage  
return  
Insert line feed after carriage  
return transmitted to the DTE  
and after echo of carriage  
returns  
14  
15  
16  
17  
Padding after line  
feed  
0
1
No padding  
Editing  
Editing is allowed during data  
transfer  
Character delete  
Line delete  
8
Ctrl H (08H of ASCII Character  
Table) is the delete character  
24  
Ctrl X (18H of ASCII Character  
Table) is the line delete  
character  
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Table 12-5: Default X.3 Parameters (Continued)  
18  
19  
Line display  
18  
Ctrl R (12H of ASCII Character  
Table) is the line display  
character  
Editing PAD  
service signals  
2
Editing PAD service signals is  
generated for display terminals  
20  
21  
22  
Echo mask  
64  
0
No echo of edit characters  
No parity check or generation  
Disabled  
Parity treatment  
Page wait  
0
To save the current X.3 parameter configuration to nonvolatile  
memory, escape to command mode and enter AT&W  
(see Escaping to AT Command Mode in Establishing an X.25  
Session). Entering AT&W saves the port and current session  
configuration as well as the X.3 parameters. The factory X.3  
configuration can be restored by entering AT&F. This  
command also restores port and current session configuration.  
CCITT specifies two standard profiles for the X.3 parameter  
set. The transparent profile is recommended for applications  
such as file transfers. The transparent profile essentially  
disables most of the PAD features so that the file can be  
transferred completely unaltered (no padding, line feed  
insertion, flow control characters, or service signal messages  
when transmitted to the DTE). The simple profile is an  
alternative configuration to the TA’s default configuration for  
simple interactive terminal applications. Table 12-6 lists the  
X.3 parameters and the values supported by the TA.  
Table 12-6: CCITT X.3 Parameter Profiles  
Parameter  
Description  
Transparent Simple  
Profile  
Profile  
1
2
3
4
5
6
PAD recall using a character  
Echo  
0
0
0
1
0
0
1
1
Data forwarding character selection  
Idle timer delay selection  
Ancillary device control  
126  
0
1
Control of PAD service and command  
signals  
1
7
8
9
Action of PAD on break from DTE  
Discard output  
0
0
0
0
0
0
Padding after carriage return  
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Table 12-6: CCITT X.3 Parameter Profiles (Continued)  
10  
11  
12  
13  
Line folding  
0
-
0
-
Binary speed of DTE  
Flow control of PAD by DTE  
0
0
1
0
Line feed insertion after carriage re-  
turn  
14  
15  
16  
17  
18  
19  
20  
Padding after line feed  
Editing  
0
0
0
0
Character delete  
Line delete  
127  
24  
18  
1
127  
24  
18  
1
Line display  
Editing PAD service signals  
Echo mask  
0
0
Parameter 1: Pad Recall Character  
This parameter designates the PAD recall character. PAD  
recall allows for escape from the PAD data transfer mode or  
connect-in-progress mode to the PAD command mode in order  
to execute a PAD command. Only one PAD command can be  
executed after the PAD has escaped to the PAD command  
mode. Once executed, the PAD returns to the previous mode  
(i.e., data transfer or connect in progress). If parameter 5 is set  
to 1, when PAD recall is executed, the PAD will output an  
XOFF before displaying the PAD prompt.  
Table 12-7: PAD Recall Character  
Value  
Description  
0
No character will result in PAD recall in either the data transfer or  
connect-in-progress mode  
1
PAD recall character = DLE. The character DLE (10H) can be used  
for PAD recall. (DLE = Ctrl P) *  
* default  
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Parameter 2: Echo  
This parameter establishes whether or not characters  
transmitted from the local DTE device to the PAD is echoed  
back to the local DTE device by the PAD. For example, if echo  
is enabled and the letter P is typed, the PAD transmits the  
letter P back to the terminal.  
Table 12-8: Echo  
Value  
Description  
0
1
No character echo  
Character echo enabled (under the restraints or (parameter 20)  
during all modes of the PAD *  
default  
Parameter 3: Selection of Data Forwarding Characters  
Characters received from the local DTE device are stored by  
the PAD until the data forwarding character is received, or  
some other data forwarding condition has occurred. Parameter  
3 designates the character or set of characters used to initiate  
the forwarding of the data stored by the PAD. Before the data  
forwarding character is transmitted to the PAD, the data stored  
by the PAD can be edited if parameter 15 is enabled.  
Other conditions that cause the PAD to automatically forward  
the data stored by the PAD are as follows:  
• If editing is disabled (parameter 15 = 0) and the PAD receives  
enough data to fill a packet, one full packet is forwarded.  
• If editing is enabled (parameter 15 = 1) and the PAD receives  
enough data to fill the PAD editing buffer, the PAD forwards  
one full packet.  
• If the maximum assembly timer expires before any other data  
forwarding conditions occur, the data currently stored by the  
PAD is forwarded. The maximum assembly timer is started  
on receipt of the first character being packeted by the PAD  
from the DTE and expires after 15 minutes.  
• If editing is disabled (parameter 15 = 0) and the idle timer  
delay expires (as set by parameter 4), the data currently stored  
by the PAD is forwarded.  
• If the PAD receives a break and the action to be performed  
upon receipt of a break is nothing (parameter 7 = 0), the data  
currently stored by the PAD is forwarded.  
• If the PAD receives the first character of a PAD command  
signal after escaping from the data transfer mode, the data  
currently stored by the PAD is forwarded.  
• If the PAD receives a set, read, or set and read PAD message  
from the remote DTE, the data currently stored by the PAD  
is forwarded.  
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Table 12-9: Data Forwarding Character  
Value  
0
Description  
No designated data forwarding character  
Data forwarding on carriage return *  
2
126  
Data forwarding on all ASCII decimal characters from 0 to 31 and  
character DEL. (Refer to Appendix F)  
*default  
If a data forwarding character’s function is duplicated, the  
associated function for the character is according to following  
priority:  
1. PAD recall  
2. Command signal delimiter  
3. XON and XOFF  
4. Line display  
5. Character delete  
6. Line delete  
7. Data forwarding  
For example, if the character DLE is assigned to two functions  
data forwarding (parameter 3 = 126) and PAD recall  
(parameter 1 = 1), DLE is treated as the PAD recall character.  
The PAD recall function has higher priority than the data  
forwarding function. This also applies to: BS, CAN, DC1,  
DC2, DC3, and DC4 (refer to Appendix F).  
Parameter 4: Selection of Idle Timer Delay  
This parameter designates the amount of idle time (time in  
which a character is not received) allowed after the PAD has  
received a character from the local DTE device before the  
entire PAD buffer is forwarded. The idle timer is not started if  
parameter15 isenabled. The decimal value storedinparameter  
4 designates the timer value in 20ths of a second.  
Table 12-10: Idle Timer Delay  
Value  
Description  
0
No idle timer delay *  
1 to 255 Specifies the timer value in 20ths of a second  
*default  
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Parameter 5: Ancillary Device Control  
Parameter 5 specifies whether or not flow control of the local  
DTE device (ancillary device) by the PAD can occur, and if so,  
what modes of the PAD the PAD flow control of the local DTE  
are allowed. Flow control of the local DTE device is handled in  
conjunction with S54 (DTE flow control register). The type of  
flow control the PAD transmits to the local DTE device is set  
according to the setting of S54. For example, if S54 is set for  
CTS flow control, the PAD will flow control the local DTE  
device by turning off the CTS pin when the PAD can no longer  
accept any characters from the local DTE. When the PAD can  
resume accepting characters from the local DTE, the PAD turns  
the CTS pin on. If all the DTE flow control options are disabled  
(default), the PAD will transmit XON (Ctrl Q) and XOFF  
(Ctrl S) to the local DTE for flow control.  
Table 12-11: Ancillary Device Control  
Value  
Description  
0
1
2
No PAD flow control  
PAD data transfer flow control  
PAD data transfer and PAD command mode flow control *  
*default  
Note: The function of parameter 5 differs from the 1984 CCITT  
X.3 Specification. The specification indicates that only XON  
and XOFF can be transmitted to the DTE for the purpose of  
flow control. The TA does not restrict the type of flow control  
used on the local DTE. The setting of the AT command indicates  
the type of flow control sent to the DTE. Thus, if the DTE device  
onlyrecognizes CTS flow control, the PAD can stillflow control  
the DTE.  
Parameter 6: Control of PAD Service Signals  
Parameter 6 specifies whether the PAD prompt or PAD service  
signals are transmitted to the local DTE device by the PAD, and  
the format of those service signals. The PAD service signals are  
character messages transmitted to the local DTE device by the  
PAD in response to PAD commands issued by the local DTE  
or to inform the user of a packet or network action (i.e., call reset  
etc.). The PAD prompt is the character *. It is transmitted by  
the PAD to the local DTE device when the PAD is in PAD  
command mode to prompt the user to enter a PAD command.  
Fornon-interactiveapplications, theservice signaltransmission  
to the local DTE may be disabled as the transmission service  
signals can appear to be part of the received data.  
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Table 12-12: PAD Service Signal Control  
Value  
Description  
0
1
5
No PAD service signals or PAD prompt  
PAD service signals in standard form but no PAD prompt  
PAD service signals and PAD prompt in standard form *  
*default  
Parameter 7: Action of PAD on Break from DTE  
Parameter 7 specifies the action taken by the PAD when the  
PAD receives a break signal from the local DTE. The break  
signal allows the DTE to signal the PAD without loss of  
character transparency. The PAD also relays a break signal to  
the DTE when the PAD receives a break from the remote DTE.  
The PAD responds to the break only when a packet call is  
established and the PAD is in the PAD data transfer mode.  
Upon receipt of the break, all data stored by the PAD is  
forwarded. The breaksignal consists of binary 0s formorethan  
135 ms.  
Table 12-13: PAD Action on DTE Break  
Value  
Description  
0
The PAD does nothing on receipt of a break in PAD data transfer, PAD  
command, or PAD connect-in-progress mode (while establishing a  
call) *  
1
An expedited interrupt packet is transmitted by the PAD prior to the  
forwarding of the stored PAD data. If a previously transmitted interrupt  
is not acknowledged, the break interrupt will wait until  
acknowledgment of the previous interrupt is received.  
2
5
A reset request packet is transmitted to the remote end after the  
forwarding of the PAD data.  
ThePADtransmitsan expeditedinterruptpacket,anystoredPADdata  
is forwarded, and an a X.29 indication of break packet is transmitted  
8
Escape from PAD data transfer. Equivalent to a PAD recall  
21  
Transmitted data is discarded, and expedited interrupt packet is  
transmitted if there is no outstanding interrupt, stored PAD data is  
forwarded, and an X.29 indication of break packet is transmitted.  
When data must be discarded, parameter 8 is set to 1. When the break  
actions are completed, parameter resets to 0.  
Parameter 7 can be any added combination of the above values.  
* default  
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Parameter 8: Discard Output  
Parameter 8 specifies whether data received by the PAD from  
the remote end is transmitted to the local DTE device. The  
control of data delivery is only possible when the PAD is in  
data transfer mode (i.e., this is the mode when data is being  
delivered to the local DTE device).  
Table 12-14: Discard Output  
Value  
Description  
0
1
Normal data delivery *  
Discard output to the DTE  
* default  
Parameter 9: Padding after Carriage Return  
Parameter 9 specifies the number of padding (null) characters  
inserted after a carriage return, which is transmitted or echoed  
to the local DTE device. This provides the printing mechanism  
of the local DTE device time to physically complete the  
carriage return (advance the printing head to the beginning of  
the line). Once complete, the PAD can resume sending data to  
the local DTE device without losing data.  
Parameter 9 also applies to the number of padding characters  
inserted afterthe formateffecter (carriage returnand line feed).  
The format effecter is sent in conjunction with PAD service  
signals to the local DTE device when the PAD is in PAD  
command mode.  
Table 12-15: Padding After Carriage Return  
Value  
Description  
0
No padding after any carriage return or the line feed of the format  
effecter. *  
If parameter 8 is set to 0 then:  
DTE Speed  
110  
# of Padding Characters  
2
4
4
4
0
300  
600  
1200  
>1200  
1 to 255 Specifies the number of padding characters  
* default  
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Parameter 10: Line Folding  
Parameter 10 specifies the maximum number of displayable  
ASCII characters the PAD can send as a single line to the local  
DTEbefore a new line is begun. The displayableASCII decimal  
characters (32 - 126) are shown in Appendix F. When the  
maximum character number is reached, the PAD inserts a PAD  
format effecter (carriage return and line feed) into the data  
streambeingtransmittedor echoed to the local DTEdevice. The  
format effecter advances the local DTE device display to the  
beginning of the next line to continue the display of the data. In  
the eventthelocalDTE device automatically insertsline folding  
when the characters reach the right-most end of the device  
display, parameter 10 should be set to 0. This parameter applies  
to data, PAD command characters, and PAD service signals.  
Table 12-16: Line Folding  
Value  
Description  
0
No line folding *  
1 to 255 Number of displayable ASCII characters per line  
*default  
Parameter 11: Binary Speed of Local DTE  
Parameter 11 reflects the current speed of the local DTE, which  
is set automatically when the terminal adapter receives an AT  
command prefix while in the AT command mode. This is a  
READ ONLY parameter. The speed indicated by parameter 11  
is the same speed indicated by S61.  
Note: The parameter 11 value for the DTE speed does not  
correspond to the same value for S61 for the same DTE speed  
(see S61).  
Table 12-17: DTE Binary Speed  
Value  
2
Description  
300 bits / sec  
3
1200 bits / sec  
2400 bits / sec  
4800 bits / sec  
9600 bits / sec  
19200 bits / sec  
38400 bits / sec  
12  
13  
14  
15  
16  
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Parameter 12: Flow Control of PAD by Local DTE  
Parameter 12 specifies whether the DTE is allowed to flow  
control the PAD. Flow control of the PAD is the handled in  
conjunction with S-register 54 (DCE flow control). The type  
of flow control the PAD recognizes depends on the setting of  
S54. For example, if S54 is set for CTS flow control, the PAD  
is flow controlled when CTS is off, and resumes transmitting  
data when CTS is on. If all of the DCE flow control options  
are disabled (default), the PAD recognizes XON (Ctrl Q) and  
XOFF (Ctrl S) as the method of flow control. The DTE flow  
control of the PAD is possible if parameter 12 is set to 1 and  
the PAD is in the data transfer mode.  
Table 12-18: PAD Flow Control by Local DTE  
Value  
Description  
Disabled DTE flow control of the PAD  
Enabled DTE flow control of the PAD *  
0
1
*default  
Note: The flow control off condition is canceled when the PAD  
leaves the data transfer mode. The flow control off condition  
does not exist when the PAD enters the data transfer mode.  
Parameter 13: Line Feed Insertion after Carriage Return  
Parameter 13 specifies if, and under what conditions, a line  
feed character is inserted in the data stream by the PAD after  
a carriage return when the PAD is in the data transfer mode.  
Enabled, the line feed insertion only applies to carriage returns  
transmitted to and / or received from the local DTE during the  
PAD data transfer mode. The format effecter (carriage return  
and line feed) of a service signal is not subject to line feed  
insertion after the carriage return since service signals are not  
transmitted in the PAD data transfer mode, but are transmitted  
in the PAD command mode.  
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Table 12-19: Line Feed Insertion  
Value  
Description  
0
1
No line feed insertion.  
Insert line feed after carriage return in the data stream received by  
the local DTE.  
2
4
Insert line feed after carriage return in the data stream from the local  
DTE. The line feed is placed in the PAD buffer and can be edited if  
parameter 15 (editing) is enabled.  
Insert line feed after echo of carriage return to the local DTE. If  
parameter 2 (echo) is disabled, this will not apply.  
Parameter 13 can be any added combination of the above values.  
default = 5 (the added combination of values 4 and 1)  
Parameter 14: Padding after Line Feed  
Parameter 14 specifies the number of padding (null) characters  
inserted after a line feed, which is transmitted or echoed to the  
local DTE. This provides the printing mechanism of the local  
DTE device time to physically complete the line feed (i.e.,  
advance the printing head to the next line). Once complete, the  
PAD can resume sending data to the local DTE device without  
any data loss. When enabled, the insertion of the padding  
characters only applies to line feeds transmitted or echoed to  
the local DTE during the PAD data transfer mode.  
Parameter 14 does not apply to line feeds that are part of a  
service signal format effecter (carriage return and line feed).  
The format effecter is transmitted as part of service signals  
when the PAD is in the PAD command mode. The format  
effecter line feed transmitted to the local DTE is padded  
according to parameter 9.  
Table 12-20: Padding After Line Feed  
Value  
Description  
0
No padding after line feed *  
1 to 255 Specifies the number of padding characters  
* default  
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Parameter 15: Editing  
Parameter 15 specifies whether editing of the currently stored  
PADdata charactersisallowedwhileinthedata transfer mode.  
Once the PAD data characters are forwarded, they can no  
longer be edited. Parameter 15 applies only to the data transfer  
mode because editing is always allowed in the PAD command  
mode (i.e., the PAD command can be edited before the user  
issues the PAD command delimiter carriage return or +  
character). Three editing functions are available:  
• Character delete  
• Line delete  
• Line display  
Table 12-21: Editing  
0
1
Editing disabled in data transfer  
Editing enabled in data transfer *  
*default  
Note: The editing characters are specified by parameters 16,  
17, and 18. Parameter 19 specifies the response to the editing  
character by the PAD.  
Parameter 16: Character Delete  
Parameter 16 specifies the character delete character. When  
the PAD receives the character delete character from the local  
DTE device, the PAD deletes the last character contained in  
the PAD buffer (the last character received from the DTE). If  
service signals can be transmitted by the PAD (parameter 6 is  
not set to0), thePAD transmitsacharacterdelete service signal  
to the DTE. The purpose of the character delete service signal  
is to delete the last character from the DTE device's display  
line. The format of the character delete service signal varies  
depending on the type of DTE device. Parameter 19 specifies  
the format of the character delete service signal for different  
DTE devices. If the PAD is in the PAD data transfer mode and  
editing (parameter 15) is not enabled, the character delete  
character is ignored by the PAD.  
The function priority for duplicated characters (because of  
duplication of parameter assignments) follows the order of  
priority as specified for parameter 3.  
Older DTE devices may not issue the character BS (08H) for  
character delete as expected. Parameter 16 must be set  
according to the character delete character the DTE device is  
transmitting to the PAD.  
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Table 12-22: Character Delete  
Value  
Description  
0 to 126 One decimal character from the ASCII Character Table is used as  
the delete character (refer to Appendix F). If parameter 16 is set to  
8, the character backspace (BS) can be used by the user to delete  
the last character stored in the PAD (i.e., the last character the PAD  
received from the local DTE).  
127  
default = ASCII decimal value 8 character BS  
Note: Do not substitute a displayable ASCII character to  
Character DEL is used as the character delete character  
initiate character delete. When used, a displayable character  
delete will delete both the initiating character and the object  
character. However, the monitor will continue to display the  
object character.  
Parameter 17: Line Delete  
Parameter17specifiesthe line deletecharacter.WhenthePAD  
receives the line delete character from the local DTE device,  
the PAD deletes the entire last line of characters contained in  
the PAD buffer that were transmitted to the PAD by the local  
DTE device. If service signals can be transmitted by the PAD  
(parameter 6 is not set to 0), the PAD transmits a line delete  
service signal to the local DTE device. This deletes the entire  
last line of characters from the DTE device’s display. The  
format of the line delete service signal varies depending on the  
type of DTE device. Parameter 19 specifies the format of the  
line delete service signal for different DTE devices. Receipt of  
the line delete character is valid when the PAD is in the PAD  
data transfer mode and editing (parameter 15) is enabled, or  
the PAD is in the PAD command mode.  
The function priority for duplicated characters (because of  
duplication of parameter assignments) follows the order of  
priority listed in the priority table provided for parameter 3.  
Older DTE devices may not issue the character CAN (18H) for  
line delete as expected. Parameter 17 must be set according to  
the line delete character the DTE device is transmitting to the  
PAD.  
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Note: Do not substitute displayable ASCII characters for line  
delete. When used, a displayable line delete will cause the first  
character in the line to remain on the display even though the  
line buffer is indeed empty.  
Table 12-23: Line Delete  
Value  
Description  
0 to 23  
One decimal character from the range 0 to 23 in the ASCII Character  
Table is used as the line delete character (refer to Appendix F).  
24  
Line delete character is CAN (18H) *  
25 to 127 One decimal character from the range 25 to 127 in the ASCII  
Character Table is used as the line delete character (refer to  
Appendix F).  
*default  
Parameter 18: Line Display  
Parameter 18 specifies the line display character. When the  
PAD receives the line display character from the local DTE  
device, the PAD sends the local DTE device the line display  
service signal. This transmit to the local DTE device the last  
entire line of characters the PAD received from the local DTE  
device. Receipt of the line display character is valid when the  
PAD is in the PAD data transfer mode and editing (parameter  
15) is enabled or the PAD is in the PAD command mode.  
The function priority for duplicated characters (because of  
duplication of parameter assignments) follows the order of  
priority listed in the priority table provided for parameter 3.  
Table 12-24: Line Display  
Value  
Description  
0 to 17  
One decimal character from the range 0 to 17 in the ASCII Character  
Table is used as the line delete character (refer to Appendix F).  
18  
Line delete character is DC2 *  
19 to 127 One decimal character from the range 19 to 127 in the ASCII  
Character Table is used as the line delete character.  
*default  
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D-Channel X.25  
Parameter 19: Editing PAD Service Signals  
Parameter 19 specifies whether editing service signals for the  
character delete (parameter 16) and line delete (parameter 17)  
are transmitted to the local DTE, and also specifies their  
formats. The line display (parameter 18) service signal is  
transmitted to the local DTE device, regardless of the  
parameter 19 setting.  
For different local DTE devices, different editing service  
signals must be transmitted to the local DTE device. For  
example, a display terminal can display the character delete  
service signal as BS SP BS, which backspaces the cursor over  
the character to be deleted, inserts a space, and then moves the  
cursor back to the deleted character position. Because a  
printing terminal is not capable of physically removing the  
character to be deleted, the character delete service signal  
displays as a slash (/) on the printing terminal device. If  
parameter 6 (control of PAD service signals) is disabled, the  
value of parameter 19 is ignored.  
Note: None of the service signals are transmitted to the local  
DTE display device if there are no characters stored by the  
PAD or parameter 6 is set to 0.  
Table 12-25: Editing PAD Service Signals  
Value  
Description  
0
No editing PAD service signals. Line display service signals are  
transmitted to the DTE  
1
For edit character, the corresponding service signal is transmitted to  
the DTE printing device:  
Edit Character  
Character Delete  
Line Delete  
Service Signal  
/
XXX CR LF  
2
For edit character, the corresponding service signal is transmitted to  
the DTE display device: *  
Edit Character  
Character Delete  
Line Delete  
Service Signal  
BS SP BS  
Transmit total character number  
of BS SP BS  
Line Display  
Display of last line of characters  
*default  
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D-Channel X.25  
Parameter 20: Echo Mask  
Parameter 20, in conjunction with parameter 2 set for character  
echo, specifies what characters are echoed by the PAD to the  
local DTE.  
If parameter 20 bit 6 is set for echo of edit characters, but  
parameter 15 is set to 0 for no edit, the edit characters issued  
in the data transfer mode are not echoed. Also, since parameter  
15 is set to 0 (no edit), no edit service signals are transmitted  
to the local DTE.  
Table 12-26: Echo Mask  
Value  
Description  
0
1
No echo mask  
No echo of CR  
2
No echo of LF  
4
No echo of VT, HT, and FF  
No echo of BEL and BS  
No echo of ESC and ENQ  
8
16  
64  
No echo of edit characters as designated by parameters 16, 17, and  
18 *  
Parameter 20 can be any added combination of the above values.  
* default  
Parameter 21: Parity Treatment  
Parameter 21 specifies whether the PAD should check parity  
in the data stream from the local DTE and/or generate parity  
in the data stream to the local DTE. The AT command @P3  
also allows parity checking to be enabled or disabled in the  
event that X.25 protocol is not in operation, and the protocol  
in operation is not capable of controlling parity checking. If  
X.25 is the active protocol, the setting of parameter 21  
overrides the setting of the AT command @P3. The DTE word  
length and parityisautomatically setwhen theterminal adapter  
receives an AT command prefix while in the AT command  
mode.  
The PAD is only specified by CCITT to operate with 7 bit  
characters plus parity or 8 bit characters and no parity. If the  
user disables parity checking and generation, and the remote  
DTE disables parity checking and generation, be sure the  
remote DTE’s parity is the same as the local DTE’s parity.  
Otherwise, the incoming data transmitted to the local DTE is  
invalid; the remote DTE’s parity will not be stripped and will  
not match the local DTE’s parity.  
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D-Channel X.25  
Since the PAD is not specified for 8 bit characters plus parity,  
do not set the local DTE’s parity to 8 bits plus parity. When the  
local DTE’s parity is set to 8 bits plus parity, the data output to  
the DTE and the PAD service signals cannot be guaranteed to  
be correct.  
IftheremoteDTE isnotstrippingtheparitybefore transmitting  
the data to the local PAD, the local PAD may not recognize  
the LF and CR characters (depending on the parity) for  
line feed insertion and padding purposes.  
Table 12-27: Parity Treatment  
Value  
Description  
0
3
No parity checking or generation *  
Parity checking and generation  
*default  
Parameter 22: Page Wait  
Parameter 22 allows for the paging of data transmitted by the  
PAD to the local DTE. This parameter specifies the number of  
allowed line feeds to be transmitted by the PAD to the local  
DTE before the PAD suspends data transmission to the local  
DTE. When the specified line count of data has been  
transmitted to the local DTE, the service signal PAGE is  
delivered to the local DTE to notify the user that the data is  
being displayed in page mode. Note that no service signal is  
transmitted to the local DTE if parameter 6 (control of service  
signals) is set to 0. No more data is delivered to the DTE until  
the user sends the XON (Ctrl Q) character to cancel the page  
wait condition. Upon cancellation of the page wait condition,  
the PAD resumes the transmission of data to the local DTE  
until the specified line feed count is reached again.  
The page wait condition can be canceled by issuing the XON  
character; however, there are certain situations that can occur  
thatwouldcausethePADtoautomaticallycancelthepagewait  
condition. These are:  
• After the echoing of a line feed that was input by the user. If  
the echo parameter (parameter 2) is not enabled, the page  
wait will not be canceled.  
• After the line deleted PAD service signal (and all its  
associated line feeds) have been transmitted to the local DTE.  
•UponleavingthePADcommandmodeafteralltheassociated  
line feeds.  
• Upon receipt of a data forwarding condition. For example, if  
parameter 3 (selection of data forwarding character)  
designates carriage return as the data forwarding character,  
when a carriage return is received from the local DTE, the  
page wait is canceled and the data currently stored by the  
PAD is forwarded.  
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D-Channel X.25  
Note: If parameter 6 (control of PAD service signals) is set to  
0 (no PAD service signals) and parameter 22 (page wait) is  
enabled, the page wait service signal will not be transmitted  
to the local DTE. However, when the number of line feeds  
specified in parameter 22 transmitting data to the local DTE  
anyway. To resume the transmission of data, an XON must be  
transmitted to the PAD by the user, or any of the above page  
wait cancellation conditions must occur.  
Table 12-28: Page Wait  
Value  
Description  
0
Page wait disabled *  
1 to 255 Maximum page wait line feed character count. After this specified  
number of line feeds, the PAD suspends transmission of data to the  
local DTE and the PAD transmits the PAGE service signals. For  
display terminals, a page wait line feed count of 23 is commonly used.  
*default  
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Softload  
Chapter 13  
Softload  
The optional softload feature lets you download new software  
into the TA through the local DTE port. The new software is  
stored in nonvolatile flash-programmable read-only memory  
devices (PROMS) and is retained even when the unit is  
powered down. This allows software updates and new features  
to be added to the TA without physically removing the unit  
from service.  
The new software files are downloaded into the TA from the  
customer’s host computer using the YModem-G file transfer  
protocol. Password protection prevents unauthorized software  
changes.  
Note: If the softload feature is not present, the %P1, $Q, $Y=x,  
$Y2=x, and $T=x commands will return an ERROR message.  
The softload feature does not interfere with normal TA  
operation, except for the swap command. While the softload  
is in progress the TA remains fully operational.  
TA SOFTWARE ARCHITECTURE  
The concepts of sets of software and how the TA’s Central  
Processing Unit (CPU) use them are described below.  
Software Sets  
The TA has two sets of operational software: the active set and  
the alternate set. The TA operates from the active set and  
performs software downloads into the alternate set.  
A swap command allows the user to swap software sets at any  
time. The active software becomes the alternate software, and  
vice versa. This swap also allows the unit to return to its  
previous version of software. The active software set selected  
is stored in a separate nonvolatile memory location and is  
retained even after powering down the unit.  
Swaps to invalid software are prevented. If a power-up occurs  
in an invalid set of software, the TA automatically swaps to  
the alternate set of software.  
Software Format  
Updated software for the TA is provided on a standard  
PC-compatible 5.25” high-density floppy diskette. The host  
computer can be a PC on any other system capable of  
reading PC-formatted floppy disks and transferring files via  
YModem-G.  
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Softload  
The TA software file contains an ASCII coded “header” which  
can be displayed to verify the software's product and version  
information before initiating the softload. On DOS based PCs,  
this can be accomplished with the “TYPE” command. For  
example, toviewthe headerinformationof afile calledTA.SL,  
enter:  
TYPE TA.SL  
A typical header might look like this:  
METHOD: SOFTLOAD YGMS-1  
PRODUCT: ISDN TA  
BOARD ID: 4563672  
CPU ID: 0  
VERSION: 1CPT-D  
TA Power-Up Sequence  
When the TA is powered up, it tries to execute the current  
active set. The active set is stored in nonvolatile memory and  
is determined by the last swap command.  
However, if the active set indicated by the nonvolatile memory  
selection is invalid, the TA will display a PROM ERROR  
message on the LCD and then attempt to execute the alternate  
set of software. This could occur if a softload session is aborted  
or a hardware failure occurs.  
If a SELECTED PROM INVALID message appears, the unit  
will still operate, but possibly with an incorrect software set.  
The error message will remain on the LCD for approximately  
three seconds.  
To clear the error, download the correct software, and then use  
the swap command to activate it. If this does not resolve the  
problem, the unit may require factory service.  
If a FATAL ERROR occurs, the unit cannot operate and  
must be serviced. PROM ERROR messages are shown in  
Table 13-1.  
Table 13-1: PROM Error Messages  
LCD Message  
Description  
SELECTED  
PROM INVALID  
Theselected PROM isinvalid(blank orlastsoftloadsession  
failed). The TA is overriding the software selection and is  
executing from the alternate software set.  
FATAL ERROR  
PROM INVALID  
The selected PROM is invalid, and the alternate software  
set is also invalid. Normal operation is not possible.  
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Softload  
SOFTLOAD OPERATION  
The softload facility in the TA supports the following  
functions: set/display softload password, request softload  
version information (on both active and alternate sets), initiate  
softload, and swap to alternate software.  
The LCD menu supports the softload operation and remains  
fully operational while the softload is in progress. The status  
can be displayed by selecting DIAGNOSTIC OPTIONS? and  
DISPLAY STATUS SOFTLOAD?.  
The status messages are shown in Table 13-2.  
Table 13-2: LCD Status Messages  
Description  
LCD Status Message  
SOFTLOAD NOT  
INITIATED  
The “not initiated” message will be displayed upon  
power-up before any softload activity has taken place.  
SOFTLOAD IN  
PROGRESS  
This message will be displayed after the softload has  
been successfully started. The message will be  
displayed as long as no problems occur with the  
softload.  
SOFTLOAD  
COMPLETE  
This message will be displayed after the successful  
completion of a softload.  
SOFTLOAD FAILED  
This message will be displayed after the softload fails  
for any reason. The error code can be viewed using the  
S59 command.  
Softload operations must be initiated using the AT commands  
listed in Table 13-3.  
Table 13-3: AT Softload Commands  
Command  
%P1  
Operation  
Display or set softload password  
$Q  
Request softload version information  
Initiate softload with password x  
$Y = x  
$Y2=x  
$T = x  
Copy active Flash PROM to alternate Flash PROM  
Swap to alternate software with password x  
The commands are described on the following pages.  
Set/Display Softload Password: %P1  
A password must be entered to perform softload and swaps.  
The %P1 command is used to display or change the softload  
password. Any password changes must be made from the local  
DTE.  
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Softload  
The password, stored in nonvolatile memory, consists of zero  
toeightalphanumeric digits. Leadingzerosaresignificant. The  
password may also be disabled, preventing any softload  
operations except inquiries.  
By default, the softload password is set to null. It is  
recommended that the softload password be changed when  
initially configuring the unit in order to prevent accidental or  
unauthorized softload attempts. The softload password  
commands are listed in Table 13-4.  
Table 13-4: Softload Password Commands  
Command  
Operation  
%P1?  
Display softload password.  
%P1 = x  
Set softload password to x, where x is 0-8 alphanumeric  
digits.  
%P1 = D  
Disable the softload function.  
Request Softload Product Version Information: $Q  
The$Qcommandreturnstheproductcode, theversionnumber  
of the active software, and the version number of the alternate  
software. It can provide a positive verification of the success  
of a softload operation, and indicates which software set is  
currently active.  
A typical response to the $Q command might be:  
PRODUCT NUMBER: 4563672  
ACTIVE SOFTWARE: 1D  
ALTERNATE SOFTWARE: 1B  
If the alternate software set contained any software versions  
that were invalid, the word INVALID would appear instead of  
a version code. A software set that is invalid cannot become  
the active software set.  
If the $Q command returns the ERROR message, the TA does  
not support the optional softload feature.  
Note: Before initiating softload, configure both the local DTE  
host computer and the local TA for a hardware (out-of-band)  
flow control method (e.g. RTS/CTS). Do not use software flow  
control (XON/XOFF), since the softload software files contain  
XON/XOFF characters that would be misinterpreted as flow  
control characters.  
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Softload  
Initiate Software Download: $Y=x  
The$Y commandinitiatesasoftloadintothealternatesoftware  
set. This command requires the softload password previously  
set by the %P1 command. If the password does not match the  
unit’s stored password, the TA will return an ERROR message.  
If the password matches, the TA begins by displaying the  
softload method ID. This ID code must match the softload  
method ID of the new software to be loaded.  
After displaying the method ID, the TA begins erasing the  
Flash memory devices for the alternate software set. If the  
erasure is successful, the TA returns a READY message and  
enters the YModem-G receive mode.  
At this point, the TA is ready to accept a softload using the  
YModem-G file transfer protocol. The TA sends the  
YModem-G initiation character (G) until the DTE begins  
sending YModem-G frames. If no frames are received within  
two minutes, the TA will time out, send an ERROR message,  
and return to the AT command mode.  
The YModem-G transfer should send one file. During the  
transfer, the TA may issue flow control requests to pace the  
DTE’s sending of data.  
After the file has been transferred, the TA verifies that the file  
has been received and programmed correctly. The TA then  
sends a response code (OK or ERROR) to the DTE indicating  
the success or failure of the entire softload.  
If an error occurs during the transfer, or if the host fails to  
respond to the YModem-G initiation requests, the TA returns  
with an ERROR message. In this case, the alternate software  
is marked as INVALID to prevent a swap attempt.  
If an error occurs during the softload, the TA attempts to cancel  
the YModem-G transfer by sending a series of ASCII CAN  
characters (18 hex). It then returns to the AT command mode,  
echoing any characters received from the DTE. Depending  
upon when the host recognizes the cancel sequence, the host  
may begin to display the echoed softload characters on its  
screen. The DTE may also abort the transfer by sending 2 or  
more CAN characters between YModem-G frames.  
An example of a typical softload session is provided at the end  
of this chapter.  
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Softload  
Copy Active Flash: $Y2=x  
The $Y2 command initiates a softload into the alternate  
software set. The source of the softload is the active software  
instead of a downloaded file. This command requires the  
softload password previously set by the %P1 command. If the  
password does not match the unit’s stored password, the TA  
will return an ERROR message.  
After verifying the password, the TA begins erasing the Flash  
memory devices for the alternate software set. If the erasure is  
successful, the TA begins programming the alternate Flash  
PROM.  
After the data has been transferred, the TA verifies that the  
flash has been programmed correctly. The TA then sends a  
response code (OK or ERROR) to the DTE indicating the  
success or failure of the entire copy.  
S59 SOFTLOAD  
To help determine the cause of any problems encountered  
during a softload, the TA can return a result code via the S59  
command to indicate the status of the latest softload. The error  
codes (Tables 13-5 and 13-6) indicate the success or reason for  
failure ofsoftloadoperations. Theyare notretainedafterpower  
off, reset, or successful swap. S59 is a read-only command,  
and is not stored in nonvolatile memory.  
Table 13-5: General Softload Error Codes  
Code  
Hex  
Description  
Softload not initiated or incomplete  
Done, OK  
0
00H  
10H  
80H  
C1H  
C2H  
C3H  
C4H  
C5H  
C6H  
C7H  
C8H  
16  
128  
193  
194  
195  
196  
197  
198  
199  
200  
Bad softload password  
YModem-G initial time-out error  
YModem-G inter frame time-out error  
YModem-G between frame time-out error  
YModem-G invalid frame number  
YModem-G CRC error  
YModem-G invalid file size error  
YModem-G premature end of file  
YModem-G cancel received (abort)  
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Softload  
Table 13-6: CPU Softload Error Codes  
Hex Description  
Code  
81  
82  
83  
84  
85  
86  
97  
98  
99  
51H  
52H  
53H  
54H  
55H  
56H  
61H  
62H  
63H  
64H  
65H  
66H  
67H  
68H  
69H  
6AH  
71H  
72H  
73H  
74H  
75H  
76H  
77H  
Softload file header too long (EOF char not found)  
Invalid softload file - missing or bad method ID  
Invalid softload file - no CPU ID  
Invalid softload file - bad CPU ID  
Duplicate softload file  
Missing softload file  
Bad softload file record length  
Bad softload file record type  
Bad softload file frame address  
Bad softload file frame offset  
Data before softload file begin record  
Duplicate softload file begin record  
Softload file end record before begin record  
Premature end of softload record  
Bad softload file checksum  
100  
101  
102  
103  
104  
105  
106  
113  
114  
115  
116  
117  
118  
119  
Premature end of softload file  
Flash PROM erase error  
Flash PROM program error  
Flash PROM ID error  
Flash PROM checksum error  
Flash Time-out Error  
Flash Word Boundary Error  
Unknown Memory Type (Flash, EPROM,  
unknown)  
120  
121  
122  
78H  
79H  
7AH  
Unit set for EPROM  
Softload In Progress On Other Port  
Copy Flash Failed  
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Softload  
Swap to Alternate Software: $T=x  
The $T command initiates a swap to the alternate set of  
software. If successful, the alternate software becomes the  
active software, and vice versa. The TA will automatically  
perform a reset to reinitialize the new software after the swap.  
A softload password must be provided with the $T command.  
If the password does not match the unit’s stored password, the  
TA will return an ERROR message.  
Before the TA attempts the swap, it first verifies that the  
alternate set of software is valid. An extensive set of tests must  
be passed during and after softloading. In order for the TA to  
allow a software swap the following conditions must be met:  
• The previous software load was complete and successful.  
• The software is loaded in the correct format.  
• The software is for the correct product.  
• The software version information is correct.  
• The checksum of the software matches its stored checksum  
value.  
If any of the above conditions is not met, then the alternate  
software is marked as invalid and the TA returns the ERROR  
message. If all verification checks pass, it returns OK and  
proceeds with the swap. The swap forces the TA to reset and  
reinitialize with the new software; this takes about 10 seconds.  
Note that the OK message is returned before the swap and reset  
are performed; to verify that the swap was actually successful,  
use the $Q command to request the software version.  
When the swap command is executed, the TA automatically  
stores the selection of active software in nonvolatile memory.  
Note: Depending upon the changes implemented in the  
software, one or more parameters in the TA’s stored profile  
may be reset following a swap command.  
TYPICAL LOCAL SOFTLOAD SESSION  
The following exampledemonstratesatypicalsoftload session  
form a local host. The host computer in this example is a  
PC-compatible computer running a typical communications  
package.  
The steps in performing a softload transfer and swap are:  
1. Check the distribution floppy diskette that contains the file  
to be downloaded. There should be a file called  
README.TXT that describes the software contained on the  
floppy and gives the name of the actual softload file. Normally,  
softload files for the UTA220 are named UTA220.SL.  
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Softload  
2. To be sure that the software in the file is correct, display the  
file on the host computer (be careful not to modify it). At the  
top of each file is a header (ASCII format) containing the  
product and version information for the softload file. If the host  
is a PC-compatible, the easiest way to do this is to enter:  
TYPE filename  
where filename is the name of the softload file to display.  
3. Load the file to be downloaded to the TA onto the host  
computer hard disk before downloading (this significantly  
decreases the download time).  
4. Connect the PC to any of the TA’s DTE port(s). Begin  
executing the communications software package on the host.  
5. Configure the host software for: 19200 bps full-duplex  
asynchronous operation, 8-bit characters with no parity, and  
RTS/CTS flow control of the DTE.  
6. Using the terminal emulation mode on the host, send an AT  
command to the TA. The TA should respond with OK.  
7. Configure the TA for RTS/CTS flow control, using either the  
keypad on the front panel or the AT&K3 command.  
8. Check the version numbers of the current software on the TA  
to verify that it is to be downloaded into the correct alternate  
set. Enter AT$Q. The TAshouldrespond withthe versioncodes  
for both the active and alternate set.  
9. Initiate Softload. Enter the AT$Y=x (where x is the softload  
password). The TA responds with either ERROR (if the  
password is invalid) or the softload method banner  
(SOFTLOAD YGMS-1). This banner identifies the download  
method and file format. The TA then begins to erase the Flash  
memory for the alternate set so that the new software can be  
downloaded.  
10. When the erase is complete, the TA returns YModem-G  
initiation characters (G). This indicates that the TA is ready to  
receive the YModem-G frames containing the new software.  
11. Initiate the YModem-G file upload mode on the host  
computer. Upload only the “.SL” file to the TA; do not attempt  
to send any other type of file. The transfer takes approximately  
3.5 minutes at 19200 bps.  
12. If any errors areencounteredduringthe file transfer attempt,  
set the host back up for the terminal emulation mode and enter  
ATS59? to display the softload error code.  
13. After the YModem-G file transfer is complete, the TA  
verifies the new software. This takes about 10 seconds. If the  
software has been transferred and programmed correctly, the  
TA returns an OK message to the DTE; otherwise it returns  
ERROR.  
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Softload  
14. After successful completion of the softload, the alternate  
memorynowcontainsthenewdownloadedsoftware. Toverify  
this, return to the terminal emulation mode on the host and  
enter AT$Q to display the software version codes. The code  
of the alternate software set should match the code contained  
in the header of the downloaded file.  
15. The user can swap and operate using the new alternate  
software now or at a later time. To perform the swap, enter  
AT$T=x where x is the softload password. The TA returns  
either OK (indicating a swap is imminent) or ERROR  
(indicating a bad password or invalid alternate software set).  
The TA resets and reinitializes after implementing the swap.  
16. To verify that the swap has occurred, enter AT$Q.  
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Diagnostics  
Chapter 14  
Diagnostics  
COMMUNICATION DIAGNOSTICS  
Communication diagnostic tests verify that the UTA220, the  
DTE, the NT1, the central office switch, and the remote unit  
are operating correctly. These tests can help determine the  
source of a fault down to a particular element responsible for it.  
GLOBAL TESTS  
2B+D Loopback  
Communication tests are initiated and terminated via the front  
panel under the GLOBAL TEST submenu of the  
DIAGNOSTIC OPTIONS menu. The following sections  
describe each of the diagnostic tests, when to use them, and  
what it means if they fail.  
This test sets the UTA220 up for a data integrity test that is run  
from the central office switch (Figure 14-1). This test causes  
the unit to loop data received from the ISDN on the D-channel  
and each B-channel back to the ISDN.  
Figure 14-1. 2B+D Terminal Loopback Test  
This is not a complete loopback; it is an echoing loopback  
where the D-channel loopback point is different from the  
B-channel loopback points.  
UTA220/UTA220k  
14-1  
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Diagnostics  
PORT TESTS  
Port communications tests are initiated and terminated via the  
front panel under the PORT TEST submenu of the  
DIAGNOSTIC OPTIONS. The following section describes  
each of the tests, when to use them and what it means if they  
fail.  
Local Terminal Loopback  
Local terminal (DTE) loopback loops data back to the DTE by  
connectingtheTDandRDpinssothatwhatevertheDTEsends  
is echoed back (Figure 14-2).  
Figure 14-2. Local Terminal Loopback Test  
To initiate the test, select LOCAL TERMINAL LOOPBK  
option from the PORT TEST submenu. The UTA220 may be  
on-line or off-line when the test is initiated. Any protocol,  
mode, and DTE rate can be used. The test is successful if the  
data is successfully echoed back to the DTE. A BERT device  
can be helpful in checking for data errors. This test verifies the  
operation of the DTE, the DTE cable, and the DTE interface  
of the UTA220.  
Local Loopback Test  
Local loopback loops data from the local terminal back to the  
terminal so that whatever the terminal sends is echoed back  
(Figure 14-3). Also the RTS pin is echoed on the CTS pin and  
the DTR pin is echoed on the DSR, DCD, and RI pins. Run  
this test if you are encountering data errors before and after  
data calls are placed. This test is useful in diagnosing the DTE  
and the UTA220.  
14-2  
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Diagnostics  
Figure 14-3. Local Loopback Test  
To initiate the test, select the LOCAL LOOP option from the  
PORT TEST submenu. The UTA220 may be on-line or off-  
line when the test is initiated. Any protocol, mode, and DTE  
rate may be used. Data from the local DTE will be echoed back  
to the sender and the CTS pin follows the RTS pin and the  
DSR, DCD and RI pins follow the DTR pin. The DTE portion  
of the test verifies the operation of the DTE, the DTE cable the  
DTE interface in the UTA220 and of the data buffers in the  
UTA220. The test is successful if the data is successfully  
echoed back to the sender. A BERT device can be helpful in  
checking for data errors.  
Digital Loopback Test  
Digital loopback loops the ISDN B-Channel data normally  
sent to the local DTE (Figure 14-4). Any B-Channel data  
received by the UTA220 is processed by the rate-adaptation  
protocol, and then echoed back out the B-channel to the  
sending unit. This test is useful in diagnosing the DTE,  
UTA220, switch ISDN line, and remote unit. Run this test if  
you encounter data errors after a call is placed successfully.  
UTA220/UTA220k  
14-3  
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Diagnostics  
Figure 14-4. Digital Loopback Test  
To initiate the test, select the DIGITAL LOOPBACK option  
from the PORT TEST submenu. The UTA220 must be on-line  
when the test is initiated (a call must be placed) before the unit  
can loop B-channel data. Any protocol, mode, and DTE rate  
may be used, although the protocol and DTE rates on the two  
units must be compatible. The remote unit should be set to the  
same rate adaptation protocol as the local UTA220, and left in  
normal data mode (NOT placed in Bilateral test mode). Data  
sent by the remote UTA220 will be received by the local  
UTA220, then echoed back to the remote UTA220. The test is  
successful if the data is correctly echoed back to the sender. A  
BERT device can be helpful in checking for data errors.  
The test should be run in both directions if possible (i.e. use  
the local UTA220 as both the sending unit and as the loopback  
unit). If the B-channel data test is successful, it indicates that  
the local and remote units and network are functioning. If there  
are errors, the problem could be in any of those elements.  
14-4  
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Diagnostics  
Bilateral Loopback Test  
Bilateral loopback combines the functions of local loopback  
and digital loopback. Its loops data from the local terminal  
back to the terminal, so that whatever the terminal sends is  
echoed back (Figure 14-5). Also, it loops to where the ISDN  
B-Channel data normally sent to the local DTE. Any  
B-Channel data received by the UTA220 is processed by the  
rate-adaptation protocol, and then echoed back out the  
B-channel to the sending unit. This test is useful in diagnosing  
the DTE, UTA220, switch, ISDN line, and remote unit. Run  
this test if you are encountering data errors after a call is placed  
successfully.  
Figure 14-5. Bilateral Loopback Test  
UTA220/UTA220k  
14-5  
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Diagnostics  
To initiate the test, select the BILATERAL LOOPBACK  
option from the PORT TEST submenu. The UTA220 can be  
on-line or off-line when the test is initiated but a call must be  
placed before the unit can loop B-channel data. Any protocol,  
mode, and DTE rate can be used, however, the protocol and  
DTE rates on the two units must be compatible. The remote  
unit should be set to the same rate adaptation protocol as the  
local UTA220 and left in normal data mode (NOT placed in  
Bilateral test mode). Data sent by the remote UTA220 will be  
received by the local UTA220 then echoed back to the remote  
UTA220. The test is successful if the data is successfully  
echoed back to the sender. A BERT device can be helpful in  
checking for data errors.  
Also, data from the local DTE will be echoed back to the DTE.  
The DTE portion of the test verifies the operation of the DTE,  
the DTE cable, the DTE interface to the UTA220, and the data  
buffers in the UTA220.  
The test should be run in both directions if possible (i.e., use  
the local UTA220 as both the sending unit and as the loopback  
unit). If the B-channel data test is successful, it indicates that  
the local and remote units and the network are functioning. If  
there are errors, the problem could be in any of those elements.  
DIAGNOSTIC STATUS DISPLAY  
The UTA220 LCD can display a status screen that provides  
diagnostic information concerning the state of the UTA220  
and the link. The status displays are found under the  
DIAGNOSTIC OPTIONS menu and are described below.  
Front Panel Keypad Test  
This test allows you to verify the functioning of the front panel  
buttons. After this test is begun, press eachkey. The key legend  
will be displayed on the LCD when the key is pressed. The *  
(UTA220k) or “HOME” (UTA220) key ends the test.  
View Product Information  
Displays software checksum, self-check status, PC board  
number and the software revision code.  
View Diagnostic Code  
This display is for factory use.  
14-6  
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Maintenance  
Chapter 15  
Maintenance  
Warning: Disconnect power before performing maintenance.  
Although dangerous voltage levels are not exposed,  
disconnecting power will ensure no electric shock hazard is  
present.  
The unit contains no internal electronic components that can  
be serviced or replaced by the user. Repairs should not be  
attempted by the user.  
FUSE  
If a fuse fails, replace it with one of equal rating. Repeated  
failure indicates a more serious problem.  
MAINTENANCE  
The unit provides maintenance free service. Periodically it is  
necessary to remove dust that has collected on internal  
components. Remove dust with a soft bristle brush and low  
pressure air or vacuum. Before attempting diagnostic tests,  
check that all connectors and plugs are firmly inserted. The test  
procedures will identify the faulty component in a bad  
communications link.  
If the unit appears faulty, contact your Motorola  
representative. Do not return the unit without prior  
instructions.  
UTA220/UTA220k  
15-1  
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Maintenance  
15-2  
UTA220/UTA220k  
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Specifications  
Appendix A  
Specifications  
ISDN Line Type  
Connection Types  
DTE Data Rates  
ISDN Basic Rate Interface  
Circuit-switched (dial-up)  
300, 1200, 2400, 4800, 9600, 19.2k, 38.4k, 48k, 56k, 57.6k,  
64k, 112k, 115.2k, 128k  
DCE Data Rates  
B-channel: 56 kbps or 64 kbps  
D-channel: 16 kbps  
Data Rate Adaption  
Protocols  
Clear Channel  
BONDING  
V.120  
T-Link  
DTE Available  
Interfaces  
EIA-232 (V.24), CCITT V.35, EIA-366A  
Switch  
Compatibility  
Northern Telecom DMS100 - Central office switch running  
software version BCS-29 or above  
Layer 1 (physical): Conforms to CCITT I.430  
Layer 2 (Link): Conforms to Northern Telecom specification  
NIS 208-4, Issue 1.1 section C, based on CCITT  
Recommendation Q.921  
Layer 3 (Signaling): For BCS-29 and BCS-30, conforms to  
NIS 208-4, Issue 1.1, sections D-H. For BCS-31, -32, and -33  
conforms to NIS 208-5, Issue 1.1 Section D-H. These are  
based on CCITT Recommendation Q.931. For BCS-34,  
conforms to National ISDN-1.  
AT&T 5ESS - Central office switch running generic program  
5E4.2, or above for type A terminal  
Layer 1 (physical): Conforms to CCITT I.430  
UTA220/UTA220k  
A-1  
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Specifications  
Layer 2 (Link): Conforms to AT&T specification  
5D5-900-311, December 1987, Part III, based on  
CCITT Recommendation Q.921  
Layer 3 (Signaling): For 5E4.2, conforms to 5D5-900-301,  
Issue 1.04, September 1987, Parts IV - VI. For 5E5, conforms  
to 5D5-900-311, Issue 1.00, December 1987, Parts IV - VII.  
For 5E6 and 5E7, conforms to 5D5-900-321, Issue 1.02,  
September 1990, Parts IV - VII. These are based on CCITT  
Recommendation Q.931. For 5E8, conforms to National  
ISDN-1.  
US National ISDN One - Central office switches, as described  
in Bellcore Special Report SR-NWT-001953, Issue 1, June  
1991, and Revision 1, December 1991  
Supplementary  
Services  
The UTA220 does not support any supplementary data  
services, nor does it support Electronic Key Telephone Service  
(EKTS).  
Dimensions  
Width  
Height  
Depth  
6.95 inches (17.65 cm)  
2.22 inches (5.69 cm)  
9.98 inches (25.35 cm)  
Environmental  
0° to + 50° C  
95% relative humidity, noncondensing  
Power  
Requirements  
115 Vac <Insert equation here> 10%, 60 Hz; or 230 Vac  
<Insert equation here> 10%, 50/60 Hz for applicable models  
Power  
Consumption  
6 watts nominal  
A-2  
UTA220/UTA220k  
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Factory Default Settings  
Appendix B  
Factory Default Settings  
Table B-1: UTA 220 Default Parameter Options  
Global Parameters  
Front Panel Lock  
Unlocked  
64 kbps  
ISDN  
Switch Parameters  
Switch Type  
National ISDN  
National ISDN-1  
None  
Switch Version  
B1-Channel Provision  
B2-Channel Provision  
D-Channel Provision  
Port 1-4 X.25 TEI  
Port #1 Data TEI  
None  
None  
Disabled  
Auto  
Port #2 Data TEI  
Auto  
Port #3 Data TEI  
Disabled  
Disabled  
NULL  
Port #4 Data TEI  
Port #1-4 SPID  
Port #1-4 Directory Number  
NULL  
Port Parameters  
DTE Sync Mode  
DTE Speed  
Asynchronous  
38.4 kbps  
DTE Parity  
Even  
DTE Number of Data Bits  
DTE Number of Stop Bits  
DTE Dialer Option  
DTE Guard  
7
1
AT  
Disabled  
DTR Pin Option  
DSR Pin Option  
Ignore DTR  
DSR Always On  
UTA220/UTA220k  
B-1  
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Factory Default Settings  
Table B-1: UTA 220 Default Parameter Options (Continued)  
DCD Pin Option  
Always On  
CTS Pin Option  
CTS follows RTS  
Protocol Option  
V.120  
Auto Answer  
On  
S Reg #0: Rings Until Answer  
S Reg #2: Escape Character  
S Reg #3: Carriage Return Character  
S Reg #4: Line Feed Character  
S Reg #5: Backspace Character  
S Reg #7: Wait for Connect  
S Reg #10: DCD Drop Time  
S Reg #12: Guard Time  
S Reg #25: DTR Detect Time  
S Reg #26: RTS to CTS Time  
Originate Option  
1
43  
13  
10  
8
30, Units = seconds  
0, Units = 1/10 second  
50, Units = 1/50 second  
5, Units = 1/100 second  
1, Units = 1/100 second  
Originate Normal  
Answer Option  
Answer Normal  
Local Echo  
On  
Status Displays  
On  
Verbose Display  
Verbose  
All Messages  
No Flow Control  
Disabled  
Profile 0  
ENBLOC  
NULL  
Connect Message Setting  
Flow Control  
Reset Flow Control  
Powerup User Profile  
Dialing Method  
Telephone Numbers 1-10  
Echo Disable Tone  
Off  
V.120 Maximum Transmit Frame Size  
V.120 Maximum Receive Frame Size  
V.120 Window Size  
256  
256  
8
V.120 T200 Retransmit Timer  
1
B-2  
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Factory Default Settings  
Table B-1: UTA 220 Default Parameter Options (Continued)  
T-Link DTR  
Normal  
Normal  
Enabled  
2
T-Link RTS  
T-Link Negotiation  
Bonding Rate Multiplier  
Bonding Secondary Call Port  
2
UTA220/UTA220k  
B-3  
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Factory Default Settings  
B-4  
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AT Command Set  
Appendix C  
AT Command Set  
Table C-1: UTA 220 AT Command Set  
Command  
Description  
Global Commands: Action  
Test Modes  
Value  
>Tn  
n =  
p =  
0
4
End Test  
2B+D Loopback  
>C  
Control Mode Exit  
>Cp  
Control Mode on Port p  
0
1
2
3
4
Control Mode Exit  
Control Port 1  
Control Port 2  
Control Port 3  
Control Port 4  
>F=  
>Ln  
Reload Global  
Front Panel Lock Level  
n =  
0
1
2
Unlocked <default>  
Option Locked  
Option/Actions  
Locked  
>W=  
>V=  
Store Global  
View Global Parameters  
G View Global Parameters  
C View Directory Numbers, SPIDs,  
and TEIs  
>Z=  
%Z1  
Z9  
Restart Network  
Restart UTA  
See >Z  
&F9  
&W9  
See >F  
See >W  
Global Commands: Miscellaneous Configuration  
See >Ln  
>Fn  
Global Commands: Switch Configuration  
!C0=  
Switch Type  
0
1
2
AT&T 5ESS  
Northern Telecom DMS-100  
National ISDN <default>  
Changing this parameter  
changes all !B, !C parame-  
ters to factory default.  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-1  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
!C1=  
Switch Software Version  
!C0=0  
!C0=1  
!C0=2  
0
1
AT&T Point-to-Point  
AT&T Multi-Point  
2
3
DMS100 PVC IC-0  
DMS100 PVC IC-1  
4
National ISDN 1  
<default>  
!C2=  
!C3=  
!C4=  
!C5=  
!N=  
SPID (by port)*  
Range: 0-20 characters  
default (null string)  
D-Channel Provisioning  
B1-Channel Provisioning  
B2-Channel Provisioning  
0
1
None <default>  
X.25  
0
9
None <default>  
Permanent  
0
9
None <default>  
Permanent  
Directory Number (by  
port)*  
Range: 0-20 characters (0-9,#,*)  
default (null string)  
Channel Parameters: LAPD  
!D0=  
SAPI-16 X.25 TEI (by port) Range: 0-63, 255 (auto), 127  
(disable)  
default (127)  
!D1  
SAPI Parameter  
Negotiation  
0
1
Disable  
Enable <default>  
!D3=  
SAPI-0 data TEI (by port)* Range: 0-63, 255 (auto), 127  
(disable)  
default (255)  
Channel Parameters: X.25 Provisional D-Channel  
!X0=  
!X1=  
!X2=  
!X3=  
Receive Window Size  
Default  
Range: 1-7  
Range: 1-7  
Range: 7-8  
Range: 7-8  
default (2)  
default (2)  
default (8)  
default (8)  
Transmit Window Size  
Default  
Receive Window Size  
Default  
Transmit Window Size  
Default  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-2  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
!X4=  
Number of Permanent  
Virtual Circuits  
Range: 0-255 default (0)  
!X5=  
!X6=  
!X7=  
!X8=  
Number of Incoming  
Logical Channels  
Range: 0-255 default (0)  
Range: 0-255 default (8)  
Range: 0-255 default (0)  
Range: 8, 128 default (8)  
Number of Two-Way  
Logical Channels  
Number of Outgoing  
Logical Channels  
X.25 Sequence Number  
Modulus  
Port Commands: Configuration  
En  
Qn  
Local Echo Off  
n =  
0
1
Echo Off  
Echo On <default>  
Status Displays  
n =  
0
1
2
Status On <default>  
Status Off  
Status Off during  
answer mode  
Vn  
Wn  
Xn  
Verbose  
n =  
n =  
0
1
Numeric  
Verbose <default>  
Carrier/Protocol Result  
Codes  
0
1
Disables <default>  
Enables  
Connect Messages  
n =  
0-4  
0
1
2
3
4
Enable Result Code  
Enable 0-5, 10-15,  
17-19, 28, 32  
Enable 0-5, 10-15,  
17-19, 28, 32  
Enable 0-5, 7, 10-15,  
17-19, 28, 32  
Enable 0-5, 7, 10-15,  
17-19, 28, 32  
S0=  
S1?  
S2=  
Rings Until Answer  
Ring Count (Read Only)  
Escape Character  
Range: 0-255 default (1)  
Range: 0-255 default (0)  
Range: 0-127 default (43)  
Range: 128-255Disabled  
S3=  
Carriage Return Character Range: 0-127 default (13)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-3  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
S4=  
Description  
Line Feed Character  
Back Space Character  
Value  
Range: 0-127 default (10)  
S5=  
Range: 0-32, 127default (8)  
Range: 33-126, 128-255Disabled  
S7=  
Wait for Connection  
DCD Drop Time  
Guard Time  
Range: 0-255 default (30)  
Units = Seconds  
S10=  
S12=  
S25=  
S26=  
&Cn  
Range: 0-255 default (0)  
Units = 1/10 seconds  
Range: 0-255 default (50)  
Units = 1/50 seconds  
DTR Detect Time  
RTS to CTS Time  
Data Carrier Detect  
Range: 0-255 default (5)  
Units = 1/100 seconds  
Range: 0-255 default (1)  
Units = 1/100 seconds  
n =  
0
1
Always On <default>  
Tracks Connection  
(async only)  
Always except during  
S10 disconnect  
2
(async only)  
n =  
&Dn  
Data Terminal Ready  
(DTR)  
0
Ignore DTR  
(async/sync)  
<default>  
1
Recall ACU (async  
only)  
Hangup-auto answer  
disabled while DTR  
down (async only)  
Hangup - reload  
parameters  
2
3
(async only)  
9
DTR Dial (async only)  
&Kn  
Flow Control (parity  
ignored)  
n =  
0
3
None <default>  
Bi-directional  
RTS/CTS  
4
5
Bi-directional  
XON/XOFF  
Transparent bi-  
directional flow  
control  
(not supported)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-4  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
&Ln  
Persistant DTR Dialing  
n =  
n =  
0
1
Disabled  
Enabled  
&Qn  
Sync Mode  
0
1
Async <default>  
Sync - DTR disc delay  
(S25)  
Sync - DTR dialing  
(autoanswerdisabled  
2
while DTR down)  
&Rn  
&Sn  
Clear to Send (CTS)  
n =  
0
1
CTS follows RTS  
<default>  
CTS always on when  
on-line  
Data Set Ready (DSR)  
0
1
DSR always on  
<default>  
DSR on after protocol  
installed except test  
modes  
&Yn  
Select Powerup User Pro- n =  
file (saved to non-volatile  
immediately)  
0
Select Stored Profile  
0 upon power up  
<default>  
Select Stored Profile  
1 upon power up  
1
&Zn  
\Qn  
Store Telephone Number  
n =  
0-9  
0-40 characters (0-9,#,*)  
n =  
0
2
3
4
Disable flow control  
<default>  
Enable unidirectional  
CTS flow control  
Enable bidirectional  
RTS/CTS flow control  
Enable bidirectional  
XON/XOFF flow  
control  
5
6
Transparent flow  
control  
Enable unidirectional  
XON/XOFF flow  
control  
%A2=  
Protocol  
0
1
2
3
None - Clear Channel  
TLink  
V.120 <default>  
Bonding  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-5  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
%A4=  
Line Channel Speed  
0
1
64 kbps <default>  
56 kbps  
%A96=  
%A97=  
%A98=  
%A99=  
@G=  
Echo Disable Tone  
Dialing Method  
Originate Mode  
Answer Mode  
0
1
Off <default>  
On  
O
E
Overlap  
Enbloc <default>  
N
V
Normal <default>  
Voice  
N
V
Normal <default>  
Voice  
DTE Guard Mode  
Dialer Commands  
D
E
Disabled <default>  
Enabled  
@P1=  
N
A
VB  
VH  
E
None  
AT <default>  
V25bis BYSYNC  
V25bis HDLC  
EIA-366  
@P2=  
DTE Speed  
Note: Speed can be entered as a  
code or a bit rate. The bit rate value  
displays.  
3
300  
5
1200  
6
2400  
7
9
4800  
9600  
12  
13  
32  
17  
18  
19  
20  
22  
21  
19200  
38400 <default>  
48000*  
56000*  
57600*  
64000*  
112000*  
115200*  
128000*  
* disables Autobaud  
@P3=  
@P4=  
Parity  
N
O
E
None  
Odd  
Even <default>  
Mark  
M
Number of Data Bits  
Range: 7-8 <default is 8>  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-6  
UTA220/UTA220k  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
@P6=  
Number of Stop Bits  
0
1
2
One <default>  
One and One-Half  
Two  
Port Commands: Action  
A
D
Answer  
Dial  
S = n  
0-9,#,*  
;
Dial stored Number n  
Digits  
Return to on-line  
command mode  
(ATO dial)s  
P,T,W  
Ignored  
H
Hangup  
In  
Information  
n =  
0
1
2
Product ID ("960")  
ROM Checksum  
Checksum  
Verification  
3
Revision  
("4563672-1NRPT3 C34A PASS")  
<board#>-<software>  
<checksum> <PASS/FAIL>  
I4  
Numeric Capability String  
Verbose Capability String  
Plug-and-Play ID  
I8  
I9  
I10  
I11  
I12  
On  
ISDN Link Status  
Port Status  
User-definable Device ID  
Return On-Line  
n =  
0
1
Return On-Line  
Return On-Line  
Zn  
Reload Port from  
non-volatile set n  
n = 0, 1  
&Fp  
Load Port from factory  
profile p  
p = 0, 1  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-7  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Test Modes  
Value  
&Tn  
n =  
0
End Test  
1
3
9
Local Loop-  
back  
back  
Digital Loop-  
L o c a l T e r -  
Bilateral  
minal Loopback  
8
Loopback  
&V=  
View Parameters  
E Port V.120  
T Port TLink  
Z Stored Telephone Numbers  
&Wn  
Store port to non-volatile  
set n  
n = 0, 1  
Port Commands: V.120 (B-Channel only)  
%E0=  
%E1=  
Maximum Transmit Frame Range: 1-260 default (260)  
Size  
Maximum Receive Frame Range: 1-260 default (260)  
Size  
%E2=  
%E3=  
%E7=  
Window Size  
Range: 1-127 default (8)  
Range: 1-255 default (5)  
T200 Transmission timer  
Protocol Option  
0
Transparent to all bits  
(SYNC/  
ASYNC) according to &Q  
Use protocols (SDLC)  
1
<default>  
%E9=  
Information Frame  
Selection  
0
1
Use I Frames <default>  
Use UI Frames  
Port Commands: TLink (B-Channel Only)  
@T0=  
@T1=  
@T2=  
@T3=  
Echo  
E Enabled  
D Disabled <default>  
DTR  
A Assert  
N Normal <default>  
RTS  
A Assert  
N Normal <default>  
Negotiation  
E Enabled <default>  
D Disabled  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-8  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
Session Parameters: X.25  
Receive Window Size  
Transmit Window Size  
Receive Packet Size  
Transmit Packet Size  
%B0=  
%B1=  
%B2=  
%B3=  
%B5=  
Range: 0-8  
Range: 0-8  
default (0)  
default (0)  
Range: 0, 7-10default (0)  
Range: 0, 7-10default (0)  
Permanent Virtual Circuit  
(PVC)  
0
1
Non-PVC <default>  
PVC  
%B6=  
%B7=  
Logical Channel Number  
D-bit Confirmation  
Range: 0-255 default (1)  
0
1
Disabled <default>  
Enabled  
%B8=  
Closed User Group (CUG)  
Option  
0
1
2
3
No CUG selected <default>  
Basic CUG  
CUG with outgoing access  
Bilateral CUG  
%B9=  
Closed User Group Name Range: 0-4 digits default (null string)  
%B10=  
Reverse Charging Option  
0
Normal Call Charging  
<default>  
1
0
Reverse Call Charging  
Use network default  
%B11=  
Receive Through Input  
Class  
<default>  
1
Reserved  
2
Reserved  
75  
3
4
110  
5
300  
6
600  
7
1200  
8
2400  
9
4800  
10  
11  
12  
13  
14  
15  
9600  
19200  
48000  
64000  
Reserved  
Reserved  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-9  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
%B12=  
Transmit Through Input  
Class  
0
Use network default  
<default>  
1
Reserved  
2
Reserved  
75  
3
4
110  
5
300  
6
600  
7
1200  
8
2400  
9
4800  
10  
11  
12  
13  
14  
15  
9600  
19200  
48000  
64000  
Reserved  
Reserved  
%B13=  
%B14=  
%B15=  
Network User ID  
RPOA  
Range: 0-16 characters  
default (null string)  
Range: 0-16 characters  
default (null string)  
Called Line Address  
Modification Code (Caller,  
Read Only)  
0
1
7
Call not redirected <default>  
Called station was busy  
Call distribution within a hunt  
group  
9
Called station was out of or-  
der  
15  
Systematic call redirection by  
called station  
Not saved in non-volatile. Initialized  
to factory defaults before each virtual  
call.  
%B16=  
Called Redirection  
Notification Code (Called,  
Read Only)  
0
Call not redirected <default>  
Called station was busy  
1
9
der  
15  
Called station was out of or-  
Systematic call redirection by  
called station  
Not saved in non-volatile. Initialized  
to factory defaults before each virtual  
call.  
%B17=  
%B18=  
Intended Call Address  
User Data  
Range: 0-15 digitsdefault (null  
string)  
Range: 0-12 characters  
default (null string)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-10  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Transmit Delay  
Value  
%B19=  
Range: 1-65535default (0)  
units = ms  
%B20=  
Reset Notice  
0
Normal operation <default>  
(write only 0)  
1
2
3
4
5
6
DTE originated  
Local procedure error  
Incompatible destination  
Network congestion  
Remote procedure error  
Reset cause unknown  
Not saved in non-volatile. User may  
clear. TA updates to normal at the  
beginning of X.25 call.  
%B99=  
Packet Reset, Clear,  
Restart Timer  
Range: 0-600 default (180)  
%B98=  
%B97=  
Packet Call Timer  
Range: 0-600 default (180)  
Auto Accept Virtual Call  
E
D
Enabled<default>  
Disabled  
Session Parameters: X.3 PAD  
%L1=  
PAD Recall Using a  
Character  
0
None  
DLE  
1
32-126  
default (0,1,0)  
%L2=  
%L3=  
Echo  
0
1
No echo  
Echo  
default (0,1,0)  
Selection of Data Forward-  
ing Characters  
0
1
2
4
None  
A-Z, a-z, 0-9  
<CR>  
<ESC>,<BEL>,<ENQ>,<ACK>  
8
<DEL>, <CAN>, <DC2>  
<ETX>, <EOT>  
<HT>, <LF>, <VT>, <FF>  
<NUL>, <SOH>, <STX>,  
16  
32  
64  
<BS>,  
<SO>, <SI>, <DLE>, <DC1>,  
<DC2>,<DC3>,<DC4>,  
<NAK>  
<SYN>, <ETB>, <EM>,  
<SUB>,  
<FS>, <GS>, <RS>, <US>  
default (0,126,0)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-11  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
%L4=  
Selection of Idle Timer  
Delay  
Range: 0-255 default (0,0,20)  
%L5=  
%L6=  
%L7=  
Ancillary Device Control  
0
Off  
1
On in data transfer  
On in data transfer and com-  
2
mand  
default (1,1,0)  
Control of PAD Service  
Signals  
0
1
mat  
5
Suppressed  
All but prompt in standard for-  
All  
default (0,1,0)  
Action on receipt of break  
signal from DTE  
0
None  
1
Send an interrupt packet  
Send a reset packet  
Send interrupt and indication  
2
5
of  
break packets  
Escape from data state  
Send interrupt and indication  
8
21  
of  
breakpacketsandset%L8to  
1
default (5,2,2)  
%L8=  
%L9=  
Discard output to DTE  
0
1
Normal Data Delivery  
Discard output to DTE  
default (0,0,0)  
Padding after carriage  
return  
Range: 0-255 default (0,0,0)  
%L10=  
%L11=  
Line Folding  
DTE Speed  
Range: 0-255 default (0,0,0)  
2
300  
1200  
600  
3
4
12  
13  
14  
15  
16  
2400  
4800  
9600  
19200  
38400  
default (16,16,16)  
%L12=  
Flow Control of the PAD  
0
1
Off  
Use \Q  
default (0,1,0)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-12  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Value  
%L13=  
Line feed insertion after  
carriage return  
0
1
2
4
None  
after <CR> to DTE  
after <CR> from DTE  
after echo of <CR>  
default (0,0,0)  
%L14=  
%L15=  
Padding after line feed  
Editing in Data Transfer  
Range: 0-255 default (0,0,0)  
0
1
None  
Edit  
%L16=  
%L17=  
%L18=  
%L19=  
Character Delete  
Line Delete  
Range: 0-127 default (8,127,127)  
Range: 0-127 default (24,24,24)  
Range: 0-127 default (18,18,18)  
Line Display  
Editing PAD Service  
Signals  
0
1
2
None  
Printers  
Displays  
default (2,1,1)  
%L20=  
Echo Mask  
0
None  
1
No echo of <CR>  
No echo of <LF>  
No echo of <VT>, <HT>,  
2
4
<FF>  
8
16  
<ENQ>  
32  
No echo of <BEL> and <BS>  
No echo of <ESC> and  
No echo of <ACK>, <NAK>,  
<STX>,<SOH>, <EOT>,  
<ETB>, <ETX>  
64  
17,  
No echo of parameters 16,  
and 18  
No echo of <NUL>, <SO>,  
128  
<SI>,  
<DLE>,<DC1>,  
<DC2>,<DC3>,  
<DC4>,<SYN>, <CAN>,  
<EM>,  
<SUB>,<FS>, <GS>, <RS>,  
<US>  
default (248,0,0)  
%L21=  
Parity  
0
3
None  
Use @P3  
default (0,0,0)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
UTA220/UTA220k  
C-13  
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AT Command Set  
Table C-1: UTA 220 AT Command Set (Continued)  
Command  
Description  
Page Wait  
Value  
%L22=  
Range: 0-255  
default (0,0,0)  
*Note: "by port" indicates that these switch parameters are associated with a  
particular port. However, this does not exclude ports from sharing the same  
SPID or TEI.+  
C-14  
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Interfaces  
Appendix D  
Interfaces  
ISDN INTERFACE  
Figure D-1 and Table 1 show the UTA ISDN.  
Figure D-1. U Interface RJ45 Pin Interfaces  
INTERFACES  
Tables 2 through 4 describe the pin functions of the DTE  
interfaces on the UTA. Use the table corresponding to the  
interface onyour UTA. Generaldescriptions of the pinsfollow.  
Note: In the following tables, unused pins have no  
electrical connection.  
Table D-1: U Interface RJ45 Pin Functions  
Name Function  
Pin  
1
Battery status  
Battery status  
----  
No connection  
2
3
4
5
No connection  
No connection  
Signal  
U interface tip or ring  
U interface tip or ring  
Signal  
UTA220/UTA220k  
D-1  
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Interfaces  
Table D-1: U Interface RJ45 Pin Functions (Continued)  
Name Function  
Pin  
6
7
8
----  
Powering  
Powering  
No connection  
No connection  
No connection  
Table D-2: EIA-232/C/V.24 Pin Functions  
DB-  
EIA-232C  
Pin  
V.24  
Pin  
Function  
25  
Pin  
1
2
3
4
5
6
7
8
AA  
BA  
BB  
CA  
CB  
CC  
AB  
CF  
DB  
DD  
LL  
101  
103  
104  
105  
106  
107  
102  
109  
114  
115  
141  
108  
---  
Protective Ground (FG)  
Transmitted Data to UTA (TC)  
Received Data from UTA (RD)  
Request to Send (RTS)  
Clear to Send (CTS)  
Data Set Ready (DSR)  
Signal Ground (SG or GND)  
Data Carrier Detect (CD or DCD)  
Transmit Clock (TC)  
15  
17  
18  
20  
21  
22  
25  
Receive Clock (RC)  
Local Loopback  
CD  
RL  
CE  
TM  
Data Terminal Ready (DTR)  
Remote Loopback  
125  
142  
Ring Indicator (RI)  
Test Mode  
D-2  
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Interfaces  
Table D-3: V.35 Pin Functions  
DB-25  
Pin  
M-34 Pin  
V.35 Function  
1
A
P
R
C
D
E
B
F
Protective Ground  
Transmitted Data A  
Received Data A  
2
3
4
Request to Send (RTS)  
Clear to Send (CTS)  
Data Set Ready (DSR)  
Signal Ground (SG)  
Received line signal detect  
Transmit clock B  
5
6
7
8
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
25  
AA/a  
S
Transmitted data B  
Transmit clock A  
Y
T
Received data B  
V
Receive clock A  
J
Ring Indicator (RI)  
Receive clock B  
X
H
BB/b  
L
Data Terminal Ready (DTR)  
Remote loopback  
LL Loopback  
K
Test Mode  
Table D-4 describes the pin functions of the DTE interfaces  
available on ports three and four of the UTA220. Use the table  
corresponding to the DTE interface on ports three and four of  
your UTA220.  
Caution: Connection to pins designated “Not Used”  
may cause unforeseen problems. Pins designated  
“Not Connected” have no electrical connection to  
the UTA220.  
UTA220/UTA220k  
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Interfaces  
Table D-4: Ports 3 and 4 Pin Functions  
EIA-232/V.24 Mode EIA-366 Mode  
Function  
DB-  
25 Pin  
V.24  
Pin  
Function  
EIA-  
366  
Pin  
EIA-  
232E  
Pin  
1
AA  
101  
103  
104  
105  
106  
107  
102  
109  
+
Frame Ground  
(FG)  
Shield Frame Ground  
2
BA  
Transmitted Data  
to UTA (TC)  
DPR  
ACR  
CRQ  
PND  
PWI  
SG  
-
Digit Present  
3
BB  
Received Data  
from UTA (RD)  
Abandon Call and  
Retry  
4
CA/CJ  
CB  
Request to Send  
(RTS)  
Call Request  
5
Clear to Send  
(CTS)  
Present Next Digit  
Power Indication  
Signal Ground  
(Not Used)  
6
CC  
Data Set Ready  
(DSR)  
7
AB  
Signal Ground  
(SG or GND)  
8
CF  
Data Carrier Detect  
(CD or DCD)  
9
(Re-  
served)  
(Not Connected)  
-
(Not Connected)  
(Not Connected)  
10  
(Re-  
served)  
+
(Not Connected)  
-
11  
12  
-
126  
(Not Connected)  
(Not Connected)  
-
-
(Not Connected)  
(Not Connected)  
SCF/CI 122/  
112  
13  
SCB  
121  
(Not Used)  
DSC  
Distant Station  
Connected  
14  
15  
16  
17  
18  
19  
SBA  
DB  
118  
114  
119  
115  
141  
120  
(Not Used)  
NB1  
NB2  
NB4  
NB8  
-
Digit Lead 1  
Digit Lead 2  
Digit Lead 3  
Digit Lead 4  
DO NOT USE  
(Not Connected)  
(Not Used)  
SBB  
DD  
(Not Used)  
(Not Used)  
LL  
Local Loopback  
(Not Connected)  
SCA  
-
D-4  
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Interfaces  
Table D-4: Ports 3 and 4 Pin Functions (Continued)  
EIA-232/V.24 Mode EIA-366 Mode  
Function  
DB-  
25 Pin  
V.24  
Pin  
Function  
EIA-  
366  
Pin  
EIA-  
232E  
Pin  
20  
21  
CD  
108/  
1,/2  
Data Terminal  
Ready (DTR)  
-
-
(Not Used)  
RL/CG  
140/  
110  
Remote Loopback  
(Not Used)  
22  
23  
CE  
125  
Ring Indicator (RI)  
(Not Used)  
DLO  
-
Data Line Occupied  
(Not Used)  
CH/CI  
111/  
112  
24  
25  
CE  
TM  
113  
142  
(Not Connected)  
Test Mode  
-
-
(Not Connected)  
(Not Used)  
EIA-366A  
Requirements  
The EIA-366 revision changed the function of pin 18 to receive  
common. If an EIA-366A device will be connected to the port,  
a special cable with the following connections must be used:  
UTA220/UTA220k  
D-5  
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Interfaces  
DTE INTERFACE PIN  
DESCRIPTIONS  
Pin functions assume that the UTA is in data mode.  
Note: There are a number of interpretations of these  
signals that the UTA can make, depending on its  
mode and configuration. The descriptions reflect the  
most common interpretations.  
Transmit Data  
Receive Data  
This pin carries data transmitted from the DTE to the UTA.  
This pin carries data from the UTA to the DTE. If no data is  
present, this line will be held in the mark state.  
Request to Send  
Clear to Send  
In asynchronous mode, this input may be used for flow control  
of the UTA or ignored. In synchronous modes, the pin can be  
used by the DTE to indicate that it is ready to send.  
Generally, used within a call to indicate when it is permissible  
for the DTE to transmit.  
Data Set Ready  
Signal Ground  
Indicates that the UTA has detected the remote UTA.  
This pin is the common return lead for all input and output  
signals on the DTE interface. It is normally connected to the  
chassis ground but can be changed via the DIP switch.  
Data Carrier Detect  
Transmit Clock  
This output, which is also called carrier detect (CD), is  
generally used within a call to indicate a connection exists to  
the remote UTA.  
In synchronous modes this output supplies the DTE with  
timing information for it to use when transmitting data to the  
UTA. This output is not used in asynchronous mode.  
D-6  
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Interfaces  
Receive Clock  
In synchronous modes, this output supplies the DTE with  
timing information for it to use when reading data from the  
UTA. This output is not used in asynchronous mode.  
Data Terminal  
Ready  
This signal is generally supplied by the DTE to indicate that it  
is ready to send data.  
Ring Indicator  
This output pulses high when the UTA detects an incoming  
data call on the ISDN.  
UTA220/UTA220k  
D-7  
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Interfaces  
D-8  
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Network Option Values  
Appendix E  
Network Option Values  
For future reference, enter the values, agreed upon with the  
telephone company, at subscription time.  
Table E-1: Network Options  
ISDN OPTIONS  
Parameter  
Factory Default  
Range  
Value  
SWITCH TYPE  
National ISDN  
AT&T  
NTI DMS100  
National ISDN  
SWITCH  
VERSION:  
5ESS  
DMS 100  
MULTI POINT  
PVC IC-  
MULTI POINT  
PT TO PT  
National ISDN  
National ISDN-1  
DIS  
PVC-IC0  
PVC-IC1  
National ISDN-1  
Port 1 X.25 TEI  
VALUE  
0-63,  
DIS,  
AUTO  
Port 1 DATA TEI AUTO  
VALUE  
0-63,  
DIS,  
AUTO  
Port 1 SPID  
Port 1 DN*  
Empty String  
0-20 characters  
(7 numeric digits for  
NI-1)  
Empty String  
DIS  
0-20 characters  
(0-9,#,*)  
(9-20 numeric digits for  
NI-1)  
Port 2 X.25 TEI  
VALUE  
0-63,  
DIS,  
AUTO  
Port 2 DATA TEI AUTO  
VALUE  
0-63,  
DIS,  
AUTO  
*
**  
For NTIDMS100 or NI-1 switch only.  
For four port UTA220 only  
UTA220/UTA220k  
E-1  
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Network Option Values  
Table E-1: Network Options (Continued)  
ISDN OPTIONS  
Factory Default  
Parameter  
Range  
Value  
Port 2 SPID  
Empty String  
0-20 characters  
(7 numeric digits for  
NI-1)  
Port 2 DN*  
Empty String  
0-20 characters  
(0-9,#,*)  
(9-20 numeric digits for  
NI-1)  
Port 3 X.25 TEI  
VALUE  
DIS  
0-63,  
DIS,  
AUTO  
Port 3 DATA TEI DIS  
VALUE**  
0-63,  
DIS,  
AUTO  
Port 3 SPID**  
Port 3 DN* **  
Empty String  
0-20 characters  
(7 numeric digits for  
NI-1)  
Empty String  
DIS  
0-20 characters  
(0-9,#,*)  
(9-20 numeric digits for  
NI-1)  
Port 4 X.25 TEI  
VALUE  
0-63,  
DIS,  
AUTO  
Port 4 DATA TEI DIS  
VALUE**  
0-63,  
DIS,  
AUTO  
Port 4 SPID**  
Port 4 DN* **  
Empty String  
0-20 characters  
(7 numeric digits for  
NI-1)  
Empty String  
0-20 characters  
(0-9,#,*)  
(9-20 numeric digits for  
NI-1)  
*
**  
For NTIDMS100 or NI-1 switch only.  
For four port UTA220 only  
E-2  
UTA220/UTA220k  
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ASCII and EBCDIC Characters  
Appendix F  
ASCII and EBCDIC Characters  
Hexadecimal equivalents of binary and decimal numbers are  
as follows:  
Binary  
0000  
0001  
0010  
0011  
0100  
0101  
0110  
0111  
1000  
1001  
1010  
1011  
1100  
1101  
1110  
1111  
Decimal  
Hexadecimal  
0
0
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10  
11  
12  
13  
14  
15  
A
B
C
D
E
F
Hexadecimal Examples:  
0101  
1001  
1110  
1011  
1101 =9D hex  
0010 =E2 hex  
=5B hex  
The following chart lists the ASCII decimal, hexadecimal,  
equivalent character values, and EBCDIC characters. The  
table only goes as high as available keyboard symbols. Control  
keys are shown in the right column of the first table.  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
(NUL)  
(SOH)  
(STX)  
(ETX)  
(EOT)  
(ENQ)  
(ACK)  
(BEL)  
(BS)  
0
1
2
3
4
5
6
7
8
9
00  
01  
02  
03  
04  
05  
06  
07  
08  
09  
NU (null)  
@
A
B
C
D
E
F
SH (start of header)  
SX (start of text)  
EX (end of text)  
PF  
HT (horizontal tab)  
LC (lower case)  
delete  
G
H
I
--  
(HT)  
--  
UTA220/UTA220k  
F-1  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
(LF)  
(VT)  
(FF)  
(CR)  
(SO)  
(SI)  
(DLE)  
(DC1)  
(DC2)  
(DC3)  
(DC4)  
(NAK)  
(SYN)  
(ETB)  
(CAN)  
(EM)  
(SUB)  
(ESC)  
(FS)  
(GS)  
(RS)  
(US)  
(SP)  
!
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
0A  
0B  
0C  
0D  
0E  
0F  
10  
11  
(SMM)  
J
VT (vertical tab)  
FF (form feed)  
CR (carriage return)  
SO (shift out)  
SI (shift in)  
DL (data link escape)  
D1 (device control 1)  
D2 (device control 2)  
D3 (device control 3)  
RE (restore)  
NL (new line)  
BS (back space)  
IL (light)  
K
L
M
N
O
P
Q
R
S
12  
13  
14  
15  
16  
17  
18  
29  
1A  
1B  
1C  
1D  
1E  
1F  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
2A  
2B  
2C  
2D  
2E  
2F  
30  
31  
32  
T
U
V
W
X
Y
Z
CN (cancel)  
EM (end of message)  
CC  
C1 (CU1)  
[
FS (form separator)  
GS (group separator)  
RS (record separator)  
US (unit separator)  
DS  
\
]
^
DEL  
--  
--  
--  
--  
SS (SOS)  
"
--  
#
--  
$
CP (bypass)  
LF (line feed)  
EB (end of block)  
EC (escape)  
--  
%
&
’
(
)
--  
*
SM  
+
C2 (CU2)  
,
--  
-
EQ (enquiry)  
AK (acknowledgment)  
BL (bell)  
.
/
0
--  
1
--  
2
SY (sync)  
F-2  
UTA220/UTA220k  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
3
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
68  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
33  
34  
35  
36  
37  
38  
39  
3A  
3B  
3C  
3D  
3E  
3F  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
4A  
4B  
4C  
4D  
44  
4E  
4F  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
5A  
--  
4
PN  
5
--  
6
UC (uppercase)  
7
ET (end of transmission)  
8
--  
9
--  
:
--  
;
C3 (CU3)  
<
=
>
?
D4 (device control 4)  
NK (no acknowledgment)  
--  
SB (substitute)  
@
A
B
C
D
E
F
space  
--  
--  
--  
--  
--  
--  
G
H
I
--  
--  
¢ (cent)  
J
. (period)  
K
L
M
D
N
O
P
< (less than)  
( (open parenthesis)  
+ (plus)  
--  
--  
& (ampersand)  
--  
Q
R
S
--  
--  
--  
T
U
V
W
X
Y
Z
(leading pad)  
--  
--  
--  
--  
! (exclamation)  
$ (dollar sign)  
UTA220/UTA220k  
F-3  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
[
91  
5B  
5C  
5D  
5E  
5F  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
6A  
6B  
6C  
6D  
6E  
6F  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
7A  
7B  
7C  
7D  
7E  
7F  
80  
81  
82  
83  
* (asterisk)  
\
92  
) (close parenthesis)  
]
93  
; (semicolon)  
^
_
‘
94  
^ (caret or ¬)  
95  
--  
96  
/ (ACK1)  
a
97  
--  
b
c
98  
--  
99  
--  
d
e
100  
101  
102  
103  
104  
105  
106  
107  
108  
109  
110  
111  
112  
113  
114  
115  
116  
117  
118  
119  
120  
121  
122  
123  
124  
125  
126  
127  
128  
129  
130  
131  
--  
--  
f
--  
g
h
i
--  
--  
--  
j
|
k
l
,
%
m
n
o
p
q
r
_
>
?
ACK0  
--  
--  
s
--  
t
--  
u
v
w
x
y
z
--  
--  
--  
--  
‘ (single quote)  
: (colon)  
{
|
# (pound)  
@ (at)  
}
~
DEL  
--  
--  
--  
--  
’(apostrophe)  
= (equal)  
" (double quote)  
--  
a
b
c
F-4  
UTA220/UTA220k  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
--  
--  
--  
--  
--  
--  
--  
--  
--  
--  
--  
--  
--  
--  
132  
133  
134  
135  
136  
137  
138  
139  
140  
141  
142  
143  
144  
145  
146  
147  
148  
149  
150  
151  
152  
153  
154  
155  
156  
157  
158  
159  
160  
161  
162  
163  
164  
165  
166  
167  
168  
169  
170  
171  
172  
84  
85  
86  
87  
88  
89  
8A  
8B  
8C  
8D  
8E  
8F  
90  
91  
d
e
f
g
h
i
--  
--  
≤ (less than or equal)  
(
+
--  
--  
j
93  
l
94  
m
n
o
p
q
r
95  
96  
97  
98  
99  
9A  
9B  
9C  
9D  
9E  
9F  
--  
--  
x
)
±
--  
--  
~
s
A0  
A1  
A2  
A3  
A4  
A5  
A6  
A7  
A8  
A9  
AA  
AB  
AC  
t
u
v
w
x
y
z
--  
UTA220/UTA220k  
F-5  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
173  
174  
175  
176  
177  
178  
179  
180  
181  
182  
183  
184  
185  
186  
187  
188  
189  
190  
191  
192  
193  
194  
195  
196  
197  
198  
199  
200  
201  
202  
203  
204  
205  
206  
207  
208  
209  
210  
211  
212  
213  
AD  
AE  
AF  
B0  
B1  
B2  
B3  
B4  
B5  
B6  
B7  
B8  
B9  
BA  
BB  
BC  
BD  
BE  
BF  
C0  
C1  
C2  
C3  
C4  
C5  
C6  
C7  
C8  
C9  
CA  
CB  
CC  
CD  
CE  
CF  
D0  
D1  
D2  
D3  
D4  
D5  
[
≥
•
S0 (SM0)  
S1 (SM1)  
S2 (SM2)  
S3 (SM3)  
S4 (SM4)  
S5 (SM5)  
S6 (SM6)  
S7 (SM7)  
S9 (SM9)  
--  
] (close bracket)  
≠ (not equal)  
--  
{ (open brace)  
A
B
C
D
E
F
G
H
I
--  
--  
(unprintable character)  
--  
(unprintable character)  
} (close bracket)  
J
K
L
M
N
O
F-6  
UTA220/UTA220k  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
214  
215  
216  
217  
218  
219  
220  
221  
222  
223  
224  
225  
226  
227  
228  
229  
230  
231  
232  
233  
234  
235  
236  
237  
238  
239  
240  
241  
242  
243  
244  
245  
246  
247  
248  
249  
250  
251  
252  
D6  
D7  
D8  
D9  
DA  
DB  
DC  
DD  
DE  
DF  
E0  
E1  
E2  
E3  
E4  
E5  
E6  
E7  
E8  
E9  
EA  
EB  
EC  
ED  
EE  
EF  
F0  
P
Q
R
--  
--  
--  
--  
--  
--  
--  
\ (back slash)  
--  
S
T
U
V
W
X
Y
Z
--  
--  
(unprintable character)  
--  
--  
--  
0
1
2
3
4
5
6
7
8
9
|
F1  
F2  
F3  
F4  
F5  
F6  
F7  
F8  
F9  
FA  
FB  
FC  
--  
--  
UTA220/UTA220k  
F-7  
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ASCII and EBCDIC Characters  
ASCII  
Symbol  
Decimal Hex  
EBCDIC  
Control  
Key  
253  
254  
255  
FD  
FE  
FF  
--  
--  
(trailing pad)  
F-8  
UTA220/UTA220k  
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Abbreviations and Acronyms  
Appendix G  
Abbreviations and Acronyms  
This appendix shows terms commonly used in data communications.  
A
ABT  
Abort Timer OR Answer Back Tone  
Alternating Current  
ac  
ACK  
ACR  
ACU  
A/D  
Acknowledgment, positive  
Abort Call, Retry  
Automatic Call Unit  
Analog-to-Digital  
ADD  
ADDR  
AGC  
ASCII  
AT&T  
Address Field  
Address  
Automatic Gain Control  
American Standard Code for Information Interchange (7 level)  
American Telephone and Telegraph  
B
BC  
Bearer Capability  
BCD  
BER  
BERT  
BIL LB  
Bit  
Binary Coded Decimal  
Bit Error Rate  
Bit-Error-Rate-Test (set)  
Bilateral Loopback  
Binary Digit  
bps  
Bits Per Second  
BSC  
Binary Synchronous Communications  
Elastic Buffer  
BUFF  
UTA220/UTA220k  
G-1  
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Abbreviations and Acronyms  
C
C
Celsius  
CA  
Circuit Assurance  
CBX  
Computerized Private Branch Exchange  
CC  
Carrier Control  
CCITT  
CCU  
International Consultative Committee for Telegraph and Telephone  
Communications Control Unit  
Carrier Detect  
CD  
CFICB  
CFIDT  
CFINT  
CFIRT  
Ch Gnd  
CIC  
Call Failure Indication - Local DCE Busy  
Call Failure Indication - No Dial Tone  
Call Failure Indication - No Answer Back Tone  
Call Failure Indication - Ringback Detected  
Chassis Ground  
Connect Incoming Call  
CMOS  
CNX  
COM  
CO  
Complementary Metal Oxide Semiconductor  
Connect Complete  
Computer Output Microfilm  
Central Office  
COS  
Call Originate Status  
CPE  
Customer Premise Equipment  
Characters Per Hour  
CPH  
CPU  
Central Processing Unit  
CR  
Carriage Return  
CRC  
Cyclic Redundancy Check  
Call Request  
CRQ  
CSA  
Canadian Standards Association  
Circuit Switched Digital Capability  
Channel Service Unit  
CSDC  
CSU  
CSULL  
CTRL  
CTS, CS  
Channel Service Unit Local Loopback  
Control Field  
Clear to Send  
G-2  
UTA220/UTA220k  
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Abbreviations and Acronyms  
D
DAA  
Data Access Arrangement (AT&T)  
Decibel  
dB, db  
dc  
Direct Current OR Digital Connection  
DCE  
DCD  
DCPSK  
DDD  
DDS  
DDS/MR  
DIC  
Data Circuit Terminating Equipment OR Data Communications Equipment  
Data Carrier Detect  
Differentially Coherent Phase- Shift Keying  
Direct Distance Dialing  
Digital Data Service OR Dataphone Digital Service (AT&T)  
Digital Data Service / Multi Rate  
Disregard Incoming Call  
Dual In-line Package  
Dip  
DIS, DS  
DLE  
Disable  
Data Link Escape  
DLO  
DMS  
DOC  
DOS  
DPR  
Data Line Occupied  
Digital Multiplexer System  
Department of Communications (Canada)  
Disk Operating System  
Digit Present  
DRS  
Data Rate Select  
DSR  
Data Set Ready  
DSU  
DTE  
Data Service Unit  
Data Terminal Equipment  
Dual Tone Multi Frequency  
Dial Tone Detected  
DTMF  
DTN  
DTR  
Data Terminal Ready  
UTA220/UTA220k  
G-3  
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Abbreviations and Acronyms  
E
EBCDIC  
Extended Binary Coded Decimal Interchange Code (8 level)  
EIA  
Electronic Industries Association  
EIA-232C EIA-232D  
Interface between DTE and Data Interchange Communication Equipment  
employing serial binary data  
EN  
Enabled  
ENQ  
EOA  
EOM  
EON  
EOT  
EPROM  
ER  
Enquiry  
End of Address  
End of Message  
End of Number  
End of Text OR End of Transmission  
Erasable Programmable Read Only Memory  
Error  
ESC  
ETB  
ETC  
ETX  
EXT  
Escape (key)  
End of Block  
External Transmit Clock  
End of Text  
External  
F
FA  
Feature Activator  
FB  
Fallback  
FCC  
FDM  
FDX  
FF  
Federal Communications Commission  
Frequency Division Modulation  
Full-Duplex Transmission  
Form Feed  
FGND  
FL  
Frame Ground  
Flag  
FLL  
Fixed loss loop  
FM  
Frequency Modulation  
Fox message  
FSK  
FX  
Test message (The quick brown fox jumps over the lazy dog) 0123456789  
Frequency-Shift Keying  
Foreign Exchange  
G-4  
UTA220/UTA220k  
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Abbreviations and Acronyms  
H
HDLC  
High Level Data Link Control  
Half-Duplex Transmission  
Hertz (cycles per second)  
HDX  
Hz  
I
INC  
Incoming Call  
INV  
Invalid  
INVCU  
INVMS  
INVPS  
INVPV  
I/O  
Invalid Command - Command Unknown  
Invalid Command - Message Syntax Error  
Invalid Command - Parameter Syntax Error  
Invalid Command - Parameter Value Error  
Input / Output  
IS  
International Standard  
ISDN  
Integrated Services Digital Network  
K
KBD  
Keyboard  
kbps  
Kilobits Per Second  
L
LAL  
Local Analog Loopback  
LAPD  
LAPM  
LB OPTS  
LCD  
LDL  
LDM  
LED  
LF  
Link Access Protocol - D Channel  
Link Access Protocol for Modems  
Loopback Options  
Liquid Crystal Display OR Line Current Disconnect  
Local Digital Loopback  
Limited-Distance Modem  
Light Emitting Diode  
Line Feed  
LINK  
LL  
Analog Telephone Line Connection  
Local Loopback  
LO  
Line Occupancy  
LRC  
Longitudinal Redundancy Check  
UTA220/UTA220k  
G-5  
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Abbreviations and Acronyms  
L (Continued)  
LSD  
Long Space Disconnect  
LSI  
Large-Scale Integrated (circuit)  
LSO  
List of Stored Options  
LSV  
List Version  
LT  
Loop or Link Termination  
M
mA  
Milliamps  
MHz  
MegaHertz  
Modem  
Modulator / Demodulator  
MR  
Modem Ready  
MR/RI  
Modem Ready / Ring Indicate  
ms  
Millisecond  
MUX  
Multiplexer  
N
NAK  
Negative Acknowledgment  
NET STAT  
Network Status  
NRZ  
Non Return to Zero  
NRZI  
Non Return to Zero Inverted  
NS  
No Signal  
NT  
Network Termination  
O
OH  
Off Hook  
OS  
Out-of-Service  
P
PBX  
Private Branch Exchange  
PC  
Personal Computer  
pc  
Printed circuit (board)  
PIW  
Power Indication  
PN  
Pseudo random  
PND  
Present Next Digit  
G-6  
UTA220/UTA220k  
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Abbreviations and Acronyms  
P (Continued)  
POTS  
Plain Old Telephone Service  
PRI  
Primary  
PRO  
Program Option  
PROG, PR  
PROM  
PRP  
Programmable  
Programmable Read Only Memory  
Restored Factory Straps  
Power / Test Mode / Error  
Phase Shift Keying  
PR/TM  
PSK  
PSTN  
PWI  
Public Service Telephone Network  
Power Indication  
Q
QAM  
Quadrature Amplitude Modulation  
R
R
Reference Designator  
Random Access Method  
Remote Analog Loopback  
Random Access Memory  
Receive Clock  
RAD  
RAL  
RAM  
RC  
RCD  
RCV, RCVR  
RD  
Receiver-Carrier Detector  
Receiver  
Receive Data  
RD/ER  
RDI  
Receive Data / Error  
Receive Data Inhibit  
Remote Digital Loopback  
Ring Indication  
RDL  
RI  
RL  
Remote Loopback  
RLO  
RLSD  
RLV  
rms  
Request List of Stored Options  
Received Line Signal Detector  
Request List of Version  
Root-Mean-Square  
UTA220/UTA220k  
G-7  
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Abbreviations and Acronyms  
R (Continued)  
RMT LB  
Remote Loopback  
RNG  
Ringback Detection  
RO  
Receive Only  
ROM  
Read Only Memory  
RT  
Remote Terminal  
RTS, RS  
Request to Send  
RX  
Receive  
S
S or S/T  
Reference Designator  
SCC  
Serial (or Satellite) Communications Controller  
SD  
Send Data  
SDLC  
SGND, SG  
SH  
Synchronous Data Link Control (IBM)  
Signal Ground  
Switch Hook  
SIM SW CR  
SNR  
Simulated Switched Carrier  
Signal / Noise Ratio  
Service Profile Identifier  
Signal Quality Detector  
Signal Quality Monitor  
Systems Status  
SPID  
SQD  
SQM  
SS  
STX  
Start of Text  
SYN  
Synchronization Character  
T
T
Reference Designator  
Terminal Adapter  
TA  
TC  
Transmit Clock  
TD  
Transmit Data  
TE  
Terminal Equipment  
Terminal Endpoint Identifier  
Telephone Company  
TEI  
TELCO  
G-8  
UTA220/UTA220k  
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Abbreviations and Acronyms  
T (Continued)  
TELSET  
Telephone Set  
TM  
TP  
Test Mode  
Test Pattern  
TR  
Terminal Ready  
Test  
TST  
TTD  
TTL  
TX  
Temporary Text Delay  
Transistor-to-Transistor Logic  
Transmit  
U
U
Reference Designator  
UART  
USOC  
Universal Asynchronous Receiver / Transmitter  
Universal Service Ordering Code  
V
V.  
CCITT Code Designation  
V.24  
List of definitions for interchange circuits between data terminal equipment and data  
circuit-terminating equipment (and provisional amendments, May 1977)  
Vac  
Volts Alternating Current  
Value Added Carrier  
Valid  
VAC  
VAL  
Vdc  
Volts Direct Current  
W
WATS  
Wide Area Telecommunications Access Method (AT&T)  
X
X.  
CCITT Recommendation Designation  
Transmit  
XMIT  
XOFF  
XON  
XTC  
Transmitter Off  
Transmitter On  
External Transmit Clock  
UTA220/UTA220k  
G-9  
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Abbreviations and Acronyms  
G-10  
UTA220/UTA220k  
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Status and Connection Messages  
Appendix H  
Status and Connection Messages  
If the UTA 220 is in command mode, and the DTE sends it a  
command, the UTA attempts to execute it and then sends a  
status message (if the option to do so is enabled) to the DTE.  
If thecommandwas a dial command, then the messageiscalled  
a connect message.  
Status messages may also be sent as the result of other  
conditions detected by the UTA 220.  
The messages sent depend on the message configuration  
options in effect: worded messages vs. number codes (ATV  
command) and normal vs. extended messages (X and W  
commands).  
Status and connect messages, number codes, text messages,  
and meanings are as follows.  
Number  
Code  
Text Message  
Meaning  
0
OK  
Command received OK  
Connection made  
1
2
3
CONNECT  
RING  
Incoming ring detected  
NO CARRIER  
Valid carrier not detected within  
period specified by register S7,  
or carrier lost for 300 ms or more  
4
ERROR  
Command not recognized or too  
long  
5
CONNECT 1200  
NO DIALTONE  
Connection made at 1200 bps  
ISDN link is not synchronized  
Dialed number is busy  
6
7
BUSY  
10  
11  
12  
14  
17  
18  
19  
20  
21  
22  
28  
32  
81  
82  
83  
84  
85  
95  
96  
97  
CONNECT 2400  
CONNECT 4800  
CONNECT 19200  
CONNECT 19200  
CONNECT 56000  
CONNECT 57600  
CONNECT 64000  
CONNECT 112000  
CONNECT 128000  
CONNECT 115200  
CONNECT 38400  
CONNECT 48000  
PROTOCOL: ISDN  
PROTOCOL: X.25  
PROTOCOL: V.120  
PROTOCOL: TLINK  
Connection made at 2400 bps  
Connection made at 4800 bps  
Connection made at 19200 bps  
Connection made at 19200 bps  
Connection made at 56000 bps  
Connection made at 57600 bps  
Connection made at 64000 bps  
Connection made at 11200 bps  
Connection made at 128000 bps  
Connection made at 115200 bps  
Connection made at 38400 bps  
Connection made at 48000 bps  
Clear Channel protocol  
X.25 protocol  
V.120 protocol  
TLINK protocol  
PROTOCOL: BONDING BONDING protocol  
D CHANNEL  
B1 CHANNEL  
B2 CHANNEL  
Using Channel D  
Using Channel B1  
Using Channel B2  
UTA220/UTA220k  
H-1  
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Status and Connection Messages  
H-2  
UTA220/UTA220k  
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128K Clear Channel Leased-Line Service  
Appendix I  
128K Clear Channel Leased-Line Service  
This appendix provides a description of commands used for  
configuring the UTA220k for 128K Clear Channel Leased  
Line (2B1Q) service.  
Configuring D- and B-Channels  
There are no D-channel activities in leased-line service;  
therefore the TEI’s are disabled and DPIDs and DNs are  
cleared for all ports.  
The AT commands in this section let you:  
•Disable TEIs and clear SPIDs and DNs  
•Configure B-channels  
Use the AT>Cn command, where n is a port number, for each  
port in turn, to specify which port to configure. (The AT>C  
command, without a number, ends control of any specified port  
and specifies control of the physically-connected port.)  
This Command...  
AT!D3=127  
AT!C2=””  
Does This:  
Disables the TEI  
Sets the SPID to an empty string  
AT!N1=””  
AT!C4=9  
Sets the DN to an empty string  
Sets the B1 channel for leased-line operation  
Sets the B2 channel for leased-line operation  
AT!C5=9  
Example:  
This command string disables the D-channel and sets the B-channels for  
leased-line operation from Port 1.  
AT>C2!D3=127!C2=””!N1=””>C!D3=127!C2=””!N1=””!C4=9!C5=9  
[enter]  
UTA220/UTA220k  
I-1  
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128K Clear Channel Leased-Line Service  
Configuring the Port and Protocol  
The AT commands in this section let you:  
•Configure the port for 128K Clear Channel  
•Enter a leased-line dial string in storage area zero  
•Save the configuration  
•Restart the network so that the leased-line switch  
configuration takes effect  
This Command...  
AT%A2=0  
AT@B0=2  
AT&L1  
Does This:  
Sets the port protocol to Clear Channel  
Sets the rate multiplier to 2  
Sets the port for persistent DTR dial  
Sets the port for sync mode 2 - DTR dialing  
Sets the stored dial string for leased line operation  
Saves the port-specific configuration  
AT&M2  
AT&Z=”B1”  
AT&W  
AT>W  
Saves the switch configuration of SPIDs, DNs,  
TEIs, and B-Channel provisioning  
AT>Z  
Restarts the network  
Example:  
This command string configures the port for 128K Clear Channel, enters a  
leased-line dial string, saves the configuration, and restarts the network:  
AT%A2=0@B0=2&M2&Z=”B1”&L1&W>W>Z [enter]  
Note: enter AT&L1 as one of the last commands to prevent the unit from  
attempting to connect immediately. Entering commands as shown in the  
example prevents the unit from connecting unexpectedly, before it has  
accepted the entire command and saved the configuration.  
I-2  
UTA220/UTA220k  
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Return Procedures  
Introduction  
The following sections apply to U.S.A. customers only. Non-U.S.A. customers with  
questions or concerns regarding return procedures should contact their Motorola  
subsidiary or distributor.  
Equipment Return If you have questions about equipment return procedures, call the Logistics  
Procedures  
Administration Group at (508) 261-4495 for advice and assistance. If you require  
either on-site service or unit-exchange service, call the Customer Support Center at  
(800)-544-0062.  
In Case of Damage If the equipment is damaged in transit, contact the shipper.  
If you have additional concerns in case of failure, about missing parts, or to return  
equipment, contact your nearest Motorola ISG representative.  
For locations  
Inside the U.S.A.  
contact...  
Motorola ISG Customer Administration  
20 Cabot Blvd. Mansfield, MA 02048-1193  
Phone (508) 261-4000, Ext. 4745  
Outside the U.S.A.  
the nearest Motorola ISG distributor. For a  
listing of our Sales and Service Offices, visit  
our Web site at:  
http://www.mot.com/MIMS/ISG/.  
Expiration of Lease To return equipment upon expiration of a lease agreement, contact your Motorola  
Sales Office for return authorization and instructions. A list of these offices follows.  
When you contact the sales office, you will be asked to provide the following  
information:  
• Product name and description  
• Serial number  
• Customer order number  
• Reason for return  
Return Procedures-1  
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Factory Repair  
To return equipment for factory repair, call the Logistics Administration Group at  
(508) 261-4495, for return authorization and instructions. When you call, you will be  
given a Return Material Authorization (RMA) control number. Mark this number  
clearly on the shipping container for ease of identification and faster service. The  
RMA control number provides a convenient tracking reference for both parties.  
Please have the following information available for each piece of equipment you  
return:  
• Product name and description  
• Serial number  
• Failure symptoms  
Packaging  
Guidelines for  
Equipment Return  
Data communications equipment or parts that are to be returned to Motorola for any  
reason must be properly packaged to prevent damage in shipment and handling.  
If the original packing material and shipping container are available, reuse these  
items to return equipment. If these items are not available, it is your responsibility to  
package the contents in a manner that protects the equipment from damage during  
normal shipping and handling. Responsibility for damage to equipment during  
transit must be resolved between you and the carrier. The Logistics Administration  
group can provide you with specific packaging instructions upon request.  
Return Procedures-2  
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Index  
Symbols  
+ + + 8-1  
A
D (Continued)  
Diagnostics  
2B+D Loopback 14-1  
Bilateral Loopback Test 14-5  
Code 14-6  
Abandon call and retry 7-4  
ASCII  
Digital Loopback Test 14-3  
Local Loopback Test 14-2  
Local Terminal Loopback 14-2  
Port Tests 14-2  
character table E-1  
AT command mode 8-1  
escaping to 12-4  
Status Display 14-6  
Dial Command 6-3  
Dial stored number  
AT Commands 8-1  
B
synchronous mode 11-1  
DIAL/HANGUP OPTIONS? 5-1  
Dialing  
Backspace Key 8-3  
Basic Rate Interface 4-2  
BONDING  
V.25 bis 1-2  
Digit present 7-3  
disconnecting 10-2  
Digit signal circuit 7-2  
Dimensions A-2  
placing a BONDING call 10-2  
setup 10-2  
Display Status 14-6  
Distant station connected 7-2  
DN 4-5  
BONDING protocol standard 10-1  
C
DSR pin operation 6-3  
DTE  
Call Connect 6-4  
Data Terminal Equipment 2-3  
interfaces A-1  
Call request 7-2  
CCITT 4-1  
DTE Character Echo 8-2  
DTE Interface 1-2  
Central office switches 1-1  
Closed User Group (CUG) 12-11  
Command Scope 8-4  
DTEdata rates A-1  
DTR pin operation 6-2  
Command Statement Buffer 8-2  
Communication diagnostics 14-1  
CONFIGURATIONS LOAD/SAVE OPTIONS? 5-1  
CONFIGURATIONS OPTIONS? 5-1  
Connection types A-1  
E
echo 8-2  
EIA-366 Dialer functions 1-2  
EIA-366 Dialing 2-3  
EIA-366A  
Cover removal 3-1  
CTS pin operation 6-3  
Dial sequence example 7-4  
D
EIA-366A dialer  
configuration 7-1  
Data channel  
EIA-366A dialer operation 7-1  
Environmental A-2  
error control 9-3  
display software version 14-6  
Data forwarding characters 12-21  
Data line occupied 7-2  
Data rate  
Escape Sequence 8-1  
escape sequence character 8-1  
adaption protocol A-1  
Data Terminal Equipment  
connection of 2-3  
F
specifications 2-3  
Facilities 12-11  
DCD pin operation 6-2  
DCE data rates A-1  
FATAL ERROR message 13-2  
Flow control  
D-channel  
of PAD by local DTE 12-26  
parameter negotiation 12-12  
Flow Control and Pin Options 9-2  
Front panel removal 3-5  
fuse 15-1  
X.25 12-1  
D-channel X.25 with ATDD command 12-2  
DIAGNOSTIC OPTIONS? 5-1  
Index-1  
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G
P (Continued)  
Group Commands 8-3  
PAD command  
Clear 12-6  
H
Interrupt 12-7  
issuing 12-6  
HDLC 6-2  
PAD Select 12-10  
PAR? 12-8  
I
RESET 12-6  
SET 12-7  
Installation 2-1  
Interface  
SET? 12-8  
STAT 12-6  
EIA-232 3-3  
V.35 3-4  
PAD command mode  
escaping to 12-4  
Interfaces  
PAD parameter  
DTE 2-3  
Parameter 18 - line display 12-30  
V.35 2-3  
PAD parameters  
ISDN 1-1, 4-1  
basic rate interface 1-1  
connection of 2-2  
line type A-1  
ISDN U 1-2  
Parameter 1 - Pad Recall Character 12-19  
Parameter 10 - line folding 12-25  
Parameter 11 - Binary speed of local DTE 12-25  
Parameter 12 - Flow control of PAD by local  
DTE 12-26  
Parameter 13 - Line feed insertion after carriage  
return 12-26  
J
Parameter 14 - Padding after Line feed 12-27  
Parameter 15 - editing 12-28  
Parameter 16 - character delete 12-28  
Parameter 17 - line delete 12-29  
Parameter 19 - editing PAD service signals 12-31  
Parameter 2 - Echo 12-20  
Parameter 20 - echo mask 12-32  
Parameter 21 - parity treatment 12-32  
Parameter 22 - page wait 12-33  
Parameter 3 - Selection of data forwarding ch 12-20  
Parameter 4 - selection of idle timer delay 12-21  
Parameter 5 - ancillary device control 12-22  
Parameter 6 - Control of PAD service signals 12-22  
Parameter 7 - Action of PAD on DTE Break 12-23  
Parameter 8 - discard output 12-24  
Parameter 9 - Padding after carraige return 12-24  
Padding characters 12-24  
Page wait 12-33  
Jack  
RJ45 2-2  
L
LCD 1-2  
Liquid Crystal Display 5-1  
LED descriptions 1-4  
LEDs 1-2  
Line delete character 12-29  
Line display character 12-30  
M
Main menus 5-1  
maintenance-free service 15-1  
N
Parity 12-32  
Network User Identification (NUI) 12-11  
NI-1 4-1  
Numbered Commands 8-3  
Pause mode, synchronous 11-1  
Power  
connection of 2-2  
consumption A-2  
O
requirements A-2  
Power-up sequence 13-2  
Present next digit 7-3  
Office switches  
AT&T 5ESS ISDN 1-1  
National ISDN 1 (NI1) 1-1  
Northern Telecom DMS100 ISDN 1-1  
Operation methods 1-2  
Product Information 14-6  
PROM 13-1  
PROM ERROR message 13-2  
PVCIC 4-5  
P
R
PAD  
rate adaption protocols 9-1  
rate multiple 10-2  
and AT@P5= 12-2  
Clear Service Signals 12-15  
command format 12-5  
command set 12-5  
functional description 12-1  
initializing 12-2  
Recognized Private Operating Agency (RPOA) 12-12  
removing cover 3-1  
removing front panel 3-5  
Repeating a Command 8-3  
Reverse charging 12-11  
modes of operation 12-3  
service signals 12-14  
Index-2  
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S
T
SELECTED PROM INVALID message 13-2  
Service signals 12-31  
TEI 4-5  
Terminal adapters 4-2  
Terminal Endpoint Identifier 4-5  
T-Link 9-1  
Setup 3-6  
Slide switch 3-3  
Softload Commands 13-3  
SOFTLOAD COMPLETE 13-3  
SOFTLOAD FAILED 13-3  
SOFTLOAD IN PROGRESS 13-3  
SOFTLOAD NOT INITIATED 13-3  
software updates 13-1  
T-Link Options 9-2  
Troubleshooting 14-1  
V
V.120 9-3  
V.25 bis 6-1  
software version 13-2  
Specifications A-1, B-1, D-1  
SPID 4-5  
STATUS DISPLAYS? 5-1  
Supervisor Command Mode 8-4  
supervisor command mode 8-4  
Supplementary services A-2  
Switch compatibility A-1  
Switches  
V.35 switch options 3-5  
X
X.2  
functional description 12-1  
X.25 session  
establishing 12-2  
X.25 virtual connection  
disconnecting 12-4  
establishing 12-3  
X.3 parameter configuration  
saving 12-16  
Programming 3-6  
symbols 8-1  
Index-3  
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WARRANTY  
Motorola warrants that equipment manufactured and sold by us is free from defects in  
material and workmanship. Under this warranty, our obligation is limited to repairing or  
replacing any equipment or parts (not already carrying a separate warranty of their supplier)  
proved to be defective by our inspection within two years after sale to their original  
purchaser. This warranty shall not apply to equipment or parts thereof which are normally  
consumed in operation, or to any equipment which shall have been repaired or altered  
outside our plant in any way, so as to, in the judgment of Motorola, affect its stability or  
reliability, nor which has been operated in a manner exceeding its specifications, nor which  
has been altered, defaced, or has had the serial number removed. Motorola does not assume  
any liability for consequential damages and, in any event, our liability shall not exceed the  
original purchase price.  
The foregoing constitutes the sole and exclusive remedy of the Buyer and exclusive liability  
of Motorola AND IS IN LIEU OF ANY AND ALL OTHER WARRANTIES EXPRESSED  
OR IMPLIED OR STATUTORY AS TO MERCHANTABILITY, FITNESS FOR PUR-  
POSE SOLD, DESCRIPTION, QUALITY, PRODUCTIVENESS OR ANY OTHER  
MATTER. Without limiting the foregoing, in no event shall Motorola be liable for the loss  
of use or profit or other collateral, special or consequential damages.  
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WARRANTY REGISTRATION CARD  
The information you supply us on the form below is extremely valuable for warranty  
protection, product alerts and new product updates. It also helps us understand how you  
are using our product and where you heard about us so that we may better serve you in the  
future. Please take a few minutes to complete the form and return it to Motorola.  
Thank you for buying Motorola Products.  
(
)
NAME  
TITLE  
PHONE  
COMPANY  
CITY  
STREET  
STATE  
ZIP  
UTA220/UTA220k  
PRODUCT MODEL  
SERIAL #  
$
PLACE OF PURCHASE  
PRICE PAID  
DATE OF PURCHASE TODAY’S DATE  
INTENDED APPLICATION(S)  
INDUSTRY REPRESENTED (Bank, Hospital, etc)  
I learned about this product through:  
Magazines I regularly read:  
Salesman  
Business Week  
Byte  
MIS Week  
A friend  
Network World  
PC Magazine  
PC Week  
Trade show  
Communications Week  
ComputerWorld  
Data Communications  
Fortune  
Direct mail  
Retail store  
PC World  
Magazine: _____________  
Other: _______________  
Wall Street Journal  
Other: _______  
Info World  
What other Motorola product(s) would you be interested in?  
High Speed Modems  
Medium Speed Modems  
Low Speed Modems  
Rack Assemblies  
Custom Modems  
Multiplexers  
International Modems  
Micro-to-Mainframe Modems  
Digital Products  
Did the shipping container and equipment arrive in good condition?  
YES NO  
Did you receive the specified accessories?  
YES NO  
If you prefer not to be added to our mailing list for future product information, please check.  
Mailing Address: Motorola, 20 Cabot Blvd., Mansfield, MA 02048  
Attention: Transmission Products Group.  
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