Telenetics Network Card 144 User Manual

Installation, Operation & Diagnostics  
for the  
MIU/PowerPort Series  
/ 2.4 / 9.6 / 14.4 / 28.8  
Industrial Grade Dial Modems  
Book 1 of 2  
(See Book 2 for AT Commands)  
Document No. 49-0002-002  
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TABLE of CONTENTS  
1. STANDARDS ....................................................................................Page 2  
2. PRODUCT OVERVIEW ...................................................................Page 3  
3. GENERAL PRODUCT SPECIFICATIONS .....................................Page 5  
4. POWER MODES ...............................................................................Page 6  
5. MODEM SPECIFICATIONS ............................................................Page 7  
6. POWER CONNECTIONS.................................................................Page 8  
7. SERIAL DATA PORT PIN-OUTS....................................................Page 9  
8. DIP SWITCHES............................................................................... Page 10  
9. LED INDICATOR ........................................................................... Page 11  
10. AUTO RESET FEATURE............................................................... Page 11  
11. AUTO DIAL FEATURE.................................................................. Page 11  
12. OUTLINE DRAWING & MOUNTING.......................................... Page 12  
13. MODEM CONFIGURATION......................................................... Page 13  
14. FACTORY CONFIGURATION...............................................Page 14 - 17  
15. DIAGNOSTICS.........................................................................Page 18 – 28  
MIU Installation, Operation & Diagnostics Edition: January 25, 1999  
Page 1  
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1. STANDARDS  
All Telenetics dial-up modems are designed to meet the following Standards:  
USA:  
FCC Part 15, Class A and Part 68  
Canada:  
DOC Standards CS-01, CS-02 and CS-03  
CANADIAN DEPARTMENT OF COMMUNICATION NOTICE  
NOTICE: The Canadian Department of Communications (DOC) label identifies certified equipment.  
This certification means that the equipment meets certain telecommunications network protective,  
operational and safety requirements. The department does not guarantee the equipment will operate to  
the user’s satisfaction.  
Before installing this equipment, make sure you are permitted to connect it to the facilities of the local  
telecommunications company. You must install the equipment using an acceptable method of  
connection. In some cases you may also extend the company’s inside wiring for single line individual  
service by means of certified connector assembly (telephone extension cord). You should be aware,  
however, that compliance with the above conditions may not prevent degradation of service in some  
situations.  
Repairs to certified equipment should be made by an authorized Canadian maintenance facility  
designed by the supplier. Any repairs or alterations made by a user to this equipment, or equipment  
malfunctions, may give the telephone communications company cause to request the user to  
disconnect the equipment.  
For your own protection, make sure 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: Do not attempt to make electrical ground connections yourself, contact the appropriate  
electric inspection authority or an electrician.  
NOTICE: The load number (LN) assigned to each terminal device denotes the percentage of the total  
load to the telephone loop used by the device, to prevent overloading. The termination on a loop may  
consist of any combination of devices, subject to the requirement that the total of the load numbers of  
all the devices does not exceed 100.  
MIU Installation, Operation & Diagnostics Edition: January 25, 1999  
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2.  
PRODUCT OVERVIEW  
The MIUPowerPortX.X Series are industrial grade dial and leased line  
modems for connection to the Public Switched Telephone Network.. They  
can be powered from a wide range of AC and DC power supplies, they are  
internally surge protected on both the power and analog lines, and they will  
operate in temperatures from -40 to +85 deg C.  
Internally, each unit consists of a baseboard and a communication  
module. The baseboard includes the power supply regulation and surge  
protection. The communication module is a Telenetics™ Pony  
Express™ Dial Modem Module.  
The MIU PowerPort is packaged specifically for the harsh environments  
found in utility substations, industrial facilities and remote sites. Though  
functionally similar to commercial modems, the MIU PowerPort includes  
special features that make it particularly well suited for utility and  
industrial applications:  
Environment:  
The MIU PowerPort has been designed specifically  
for use in harsh environments. In addition to an  
extended temperature range (-40 to +85º C), the MIU  
includes surge, shock, vibration, and safety features  
superior to those of conventional commercial  
modems.  
Power Supply:  
Low Power:  
The MIU PowerPort can be powered from a range of  
AC and DC power sources: +5 VDC, 12 VDC Battery,  
7 to 16 VAC or 8 to 16 VDC. An optional 120 VAC  
wall transformer is available from Telenetics.  
The MIU PowerPort dial modems can be configured  
to enter into a “power down” mode. In this mode, an  
MIU PowerPort will consume only a small fraction of  
its active power while waiting for either controller or  
telephone line activity.  
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Industrial:  
The MIU PowerPort is packaged in a rugged, compact,  
non-metallic (ABS) enclosure. Designed for  
unmanned locations, the MIUs do not include the  
array of pushbuttons and LEDs normally associated  
with consumer-type modems to increase reliability  
and decrease power consumption. Configuration is by  
dip switches and/or software (“AT”) commands.  
Standard industrial connectors for data, analog and  
power interfaces allow reliable interconnection to  
other industrial components.  
MIU Installation, Operation & Diagnostics Edition: January 25, 1999  
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3. GENERAL PRODUCT SPECIFICATIONS  
Dimensions:  
Weight:  
5.3 x 4.0 x 1.375 inches  
1 lb  
Voltage Supply:  
:
8 to 24 VDC  
7 to 16 VAC, 50/60 Hz  
115 VAC, 50/60 Hz  
Optional Wall Transformer  
Current Requirements: (See Section 4 for Power Down Modes)  
MIU PowerPort 2.4:  
12VDC  
24VDC  
125VDC  
120VAC  
220VAC  
65mA  
27mA  
7.5mA  
6.5mA  
5.5mA  
MIU PowerPort 9.6:  
12VDC  
24VDC  
125VDC  
120VAC  
220VAC  
115mA  
57mA  
11mA  
10mA  
9mA  
MIU1 PowerPort 4.4:  
12VDC  
24VDC  
125VDC  
120VAC  
220VAC  
160mA  
69mA  
14mA  
12mA  
9mA  
MIU PowerPort 28.8:  
12VDC  
24VDC  
125VDC  
120VAC  
220VAC  
205mA  
125mA  
16mA  
15mA  
11mA  
Surge Protection:  
Power Supply: 8kVrms  
Analog Line:  
5kVac (MIU2.4 & 9.6)  
3.75kVac (MIU14.4 & 28.8)  
ESD ± 10kV  
Digital Line:  
Operating Temperature:  
Operating Humidity:  
Storage Temperature:  
-40 to +85 deg C  
0 to 90% (non-condensing.)  
-55 to 100 deg C  
* Note: At temperatures below 0° F, an additional current drain of up to 350 ma  
occurs as the internal proportional heater operates.  
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4. POWER MODES  
Mode  
Description  
Power  
Consumption  
See Section 3  
Power On  
Sleep  
Factory Setting: Full power is always  
available to the modem.  
If the modem is on hook for a  
predetermined period (PE2400 = 5  
seconds; PE2496, PE14.4 & PE28.8 =  
software configured: Set S24 to desired  
delay in seconds), it will drop to a low  
current mode).  
Approx. 6mA  
The modem will instantly “wake up” to  
full power by either an incoming ring  
signal or any transmit data (TxD) signal.  
If the modem is on hook for 30 seconds,  
it will automatically turn “off”.  
Power Down  
Approx. 20µA  
The modem will automatically turn “on”  
to full power within 400ms of receiving a  
DTR signal or an incoming call.  
The power mode is set by a dip switch on the Pony Express Modem Module  
inside the MIU case. Factory default is Power On mode. Other modes are set at  
the factory before shipment if requested. Other modes can be set in the field ~ call  
Telenetics for an instruction sheet.  
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5. MODEM SPECIFICATIONS  
MIU2.4  
MIU9.6  
V.22bis  
V.22  
Bell212A  
Bell 103  
MIU14.4  
V.32bis  
V.32  
V.22bis  
V.22  
MIU28.8  
V.34  
V.32bis  
V.32  
V.22bis  
V.22  
Bell212A  
Bell 103  
Standards  
V.22bis  
V.22  
Bell212A  
Bell 103  
Bell212A  
Bell 103  
Modem Line  
Speed  
(Asynch)  
2400bps  
1200bps  
300bps  
2400bps  
1200bps  
300bps  
14400bps  
9600bps  
4800bps  
2400bps  
1200bps  
300bps  
28800bps  
19200bps  
14400bps  
9600bps  
4800bps  
2400bps  
1200bps  
300bps  
DTE Rates  
above Modem  
Line Speeds  
-
-
19200bps  
9600bps  
4800bps  
57600bps  
38400bps  
19200bps  
115200bps  
57600bps  
38400bps  
19200bps  
Error  
Correction &  
Data  
MNP 2,3,5  
& 10  
MNP 2,3,5  
& 10  
MNP 2,3,5  
& 10  
V.42  
V.42  
V.42  
Compression  
V.42bis  
V.42bis  
V.42bis  
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6. POWER CONNECTIONS  
DC Power Jack, 2.0mm – This standard concentric jack is provided to attach an  
external power source in the range of 7 – 16 VAC or 8 – 24 VDC. The 2.0mm  
Jack connects through a full wave bridge so either polarity is acceptable from the  
DC source. The slide switch adjacent to the LED must be to the right side  
(Toward the 2.0mm Jack).  
DB – 25, Pin 10 – A DC voltage may be applied at the 25 pin data connector. DC  
only with the positive lead connected to pin 10, and the negative lead connected to  
Signal Ground on pin 7. This should be a regulated 5 VDC source. The slide  
switch adjacent to the LED must be to the left side (Away from the 2.0mm Jack).  
Internal jumper JP1 must be on pins 1-2.  
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7. SERIAL DATA PORT PIN-OUTS  
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8. DIP SWITCH SETTINGS  
Not Applicable – The dip switches are on the PE Module. Contact factory  
for non – standard settings.  
* NOTE: Opening the MIU for any reason voids the factory warranty.  
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9. LED INDICATOR  
The MIU has a single LED that will indicate the following conditions...  
4
4
Blinking: POWER ON  
Steady: MODEM CONNECTED (CARRIER DETECT)  
10. AUTO RESET FEATURE  
The dial-up modem modules inside your MIU include an “Auto Reset”  
feature: If the modem configuration is lost for any reason, it can be  
restored by dialing the modem and allowing it to ring 4 to 6 times.  
The Auto Reset feature is enabled and disabled by a dip switch on the  
modem module. Your MIU will have been shipped with the Auto Reset  
mode active, unless otherwise specified at the time of ordering. Please  
consult Telenetics if you wish to open up your MIU to disable Auto Reset.  
11. AUTO DIAL FEATURE  
The dial-up modem modules inside your MIU include a software  
configured “Auto Dial” feature: Command AT\D1 will enable Auto Dial:  
When DTR goes from an OFF to ON condition, and \D1 is set, the modem  
will auto dial the phone number stored in location & Z0 (up to 45 digits).  
Command \D0 (default) will disable the Auto Dial feature.  
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12. OUTLINE DRAWING & MOUNTING  
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13. MODEM CONFIGURATION  
Telenetics dial and leased line modems are based upon Rockwell chipsets.  
These chipsets contain Rockwell’s “AT” command set.  
A summary of the Rockwell command set for your MIU modem is  
provided in Book 2.  
Unless otherwise specified at the time of order, your modem will have left  
the Telenetics factory in the configuration detailed on the following pages.  
The Telenetics factory configuration differs from the Rockwell default  
configuration as follows...  
&C0  
&C1  
Rockwell Default  
Telenetics Factory  
Carrier Detect (CD) always ON.  
Carrier Detect (CD) only ON  
when modem connected (on hook)  
S0=0  
S0=1  
Rockwell Default  
Telenetics Factory  
Auto-Answer OFF  
Auto-Answer on first ring  
You can review the configuration of your modem by entering AT&V  
<CR>.  
You can restore the Rockwell factory configuration by entering  
AT&F&W  
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14. FACTORY CONFIGURATION ~ MIU2.4  
ACTIVE PROFILE:  
B1 E1 L2 M1 Q0 V1 X4 Y0 &C1 &D0 &G0 &J0 &L0 &P0 &Q0  
&R0 &S0 &X0 &Y0 S00:001 S01:000 S02:043 S03:013 S04:010  
S05:008 S06:002 S07:030 S08:002 S09:006 S10:014 S12:050  
S14:AAH S16:00H S S18:000 S21:00H S22:76H S23:15H S25:005  
S26:001 S27:40H S28:00H  
STORED PROFILE 0:  
B1 E1 L2 M1 Q0 V1 X4 Y0 &C1 &D0 &G0 &J0 &L0 &P0 &Q0  
&R0 &S0 &X0 S00:001 S14:AAH S18:000 S21:00H S22:76H  
S23:17H S25:005 S26:001 S27:40H S28:00H  
STORED PROFILE 1:  
B1 E1 L2 M1 Q0 V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0  
&R0 &S0 &X0 S00:000 S14:AAH S18:000 S21:00H S22:76H  
S23:17H S25:005 S26:001 S27:40H S28:00H  
TELEPHONE NUMBERS  
&Z0=  
&Z1=  
&Z2=  
&Z3=  
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14. FACTORY CONFIGURATION ~ MIU9.6  
ACTIVE PROFILE:  
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3  
&Q5 &R1 &S0 &T5 &X0 &Y0 S00:001 S01:000 S02:043 S03:013  
S04:010 S05:008 S06:002 S07:050 S08:002 S09:006 S10:014  
S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000  
S38:020 S44:020 S46:138 S48:007 S95:000  
STORED PROFILE 0:  
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3  
&Q5 &R1 &S0 &T5 &X0 S00:001 S02:043 S06:002 S07:050  
S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007  
S37:000 S40:168 S41:195 S46:138 S95:046  
STORED PROFILE 1:  
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3  
&Q5 &R1 &S0 &T5 &X0 S00:001 S02:043 S06:002 S07:050  
S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007  
S37:000 S40:168 S41:195 S46:138 S95:000  
TELEPHONE NUMBERS:  
0=  
2=  
1=  
3=  
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14. FACTORY CONFIGURATION ~ MIU14.4  
ACTIVE PROFILE:  
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3  
&Q5 &R1 &S0 &T5 &X0 &Y0 S00:001 S01:000 S02:043 S03:013  
S04:010 S05:008 S06:002 S07:050 S08:002 S09:006 S10:014  
S11:095 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000  
S38:020 S44:020 S46:138 S48:007 S95:000  
STORED PROFILE 0:  
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3  
&Q5 &R1 &S0 &T5 &X0 S00:001 S02:043 S06:002 S07:050  
S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007  
S37:000 S40:168 S41:195 S46:138 S95:046  
STORED PROFILE 1:  
B1 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3  
&Q5 &R1 &S0 &T5 &X0 S00:001 S02:043 S06:002 S07:050  
S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007  
S37:000 S40:168 S41:195 S46:138 S95:000  
TELEPHONE NUMBERS:  
0=  
2=  
1=  
3=  
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14. FACTORY CONFIGURATION ~ MIU28.8  
ACTIVE PROFILE:  
B0 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D0 &G2 &J0 &K3  
&Q5 &R1 &S0 &T4 &X0 &Y0 S00:001 S01:000 S02:043 S03:013  
S04:010 S05:008 S06:002 S07:030 S08:002 S09:006 S10:014  
S11:255 S12:050 S18:000 S25:005 S26:001 S36:007 S37:000  
S38:020 S46:138 S48:007 S95:000  
STORED PROFILE 0:  
B0 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D0 &G2 &J0 &K3  
&Q5 &R1 &S0 &T4 &X0 S00:001 S02:043 S06:002 S07:030  
S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007  
S37:000 S40:105 S41:003 S46:138 S95:000  
STORED PROFILE 1:  
B0 E1 L1 M1 N1 Q0 T V1 W0 X4 Y0 &C1 &D0 &G2 &J0 &K3  
&Q5 &R1 &S0 &T4 &X0 S00:001 S02:043 S06:002 S07:030  
S08:002 S09:006 S10:014 S11:095 S12:050 S18:000 S36:007  
S37:000 S40:105 S41:003 S46:138 S95:000  
TELEPHONE NUMBERS:  
0=  
2=  
1=  
3=  
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15. DIAGNOSTICS  
The following pages provide software and hardware techniques for  
diagnosing communication problems and thereby isolating the problem at  
either the local modem, the remote modem or the interconnecting line.  
The following AT&Tn commands form part of the CCITT V.54 protocol  
and can be used for diagnostic testing.  
Note: &Tn commands can only be used when the modem is configured for  
&Q0 <CR> (unbuffered/direct asynchronous mode).  
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&T0 TERMINATE TEST IN PROGRESS  
If a V.54 loopback test is in progress as a result of executing an &Tn  
command, then the &T0 command will cause that test to be terminated,  
provided that the modem is in the command state or a V.54 state that  
accepts commands from the DTE. See specific &Tn command  
descriptions for termination actions.  
&T1 INITIATE LOCAL ANALOG LOOPBACK (See Figure 2)  
When the AT&T1 command is entered, the modem goes on hook and  
configures itself for analog loopback. DSR is turned off (if &S1 is in  
effect), the analog loopback state is entered, and the test timer is set to the  
value in S18. A connect result code is sent to the DTE, and the test timer  
then begins its count down. The test terminates when the test timer  
expires. If S18 equals 0, then the test must be terminated by an &T0, H0,  
or Z command. While any command may be entered while the modem is  
in this test state, the modem response is not specified except for H0, &T0  
and Z, any of which will terminate the test. Upon termination of the test,  
the modem enters the command state.  
RESULT CODE  
CONNECT  
ERROR  
DESCRIPTION  
When local analog loopback state is  
entered.  
If any other &Tn test is active (except  
&T0) or if in the on-line command  
state.  
OK  
After test is stopped by test timer, the  
H0 command, or the &T0 command.  
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&T2 NO FUNCTION  
&T3 PERFORM LOCAL DIGITAL LOOPBACK (See Figure 3)  
The modem must be in the command state with connection established  
when this command is issued, otherwise an ERROR result code occurs.  
The AT&T3 command establishes a loopback of received data, after  
demodulation, and sends it back to the distant end. The modem is  
configured for local digital loopback, DSR is turned off (if &S1 is in  
effect), the test timer is started with the value in S18, and an OK result  
code is sent to the DTE. If S18 contains a 0, the test must be terminated  
by a &T0, H0, or Z command. The latter two result in the modem going  
on hook. If S18 does not contain 0, the test is terminated after the number  
of seconds stored in S18.  
RESULT CODE  
DESCRIPTION  
OK  
After 2 second delay  
ERROR  
If any other self test is active (&T1,  
&T6, &T7 or &T8) or if in idle state.  
When test is terminated.  
&T4 GRANT REMOTE DIGITAL LOOPBACK (RDL) REQUESTS  
When in the on-line state, the modem will honor a remote digital  
loopback request from a distant modem if it occurs. This will result in an  
ERROR if the command is given while any V.54 test is active (&T1, &T3,  
&T6, &T7 or &T8).  
NOTE: There are data patterns that may cause a Remote Digital  
Loopback conditions. Care should be given to the type of data being  
received so that no RDL modes will be initiated.  
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&T5 DENY RDL REQUESTS  
The modem will not respond to a remote digital loopback request from a  
distant modem. This will result in an error if the command is given while  
any V.54 test is active (&T1, &T3, &T6, &T7 or &T8).  
&T6 INITIATE REMOTE DIGITAL LOOPBACK (See Figure 4)  
The command is valid only if the modem is in the command state with a  
connection established.  
Configure the modem under test with an AT&T4 command so that it will  
honor a remote digital loopback request.  
Enter AT&T6 at the local modem and it will send a remote digital  
loopback request to the remote modem. After the RDL acknowledgement  
signal is received from the remote modem, DSR is turned off (if &S1 is in  
effect), the on-line state is entered, a CONNECT result code is sent to the  
DTE, and the test timer is set to the value in S18.  
If the local modem does not receive the RDL acknowledgment signal  
from the remote end in three seconds, it sends an ERROR result code to  
the DTE and returns to the command state. The local modem sends the  
signal to release the remote digital loopback when the test is terminated.  
The test may be terminated by the H0, Z, or &T0 command. The test will  
also terminate when the test timer expires (sending the modem to the  
command state) or carrier is lost (causing a NO CARRIER result code  
and the modem to go on hook in the command state).  
RESULT CODE  
DESCRIPTION  
CONNECT  
ERROR  
When on-line state is entered.  
If any V.54 test is active (&T1, &T3,  
&T6-&T8).  
ERROR  
ERROR  
If not in on-line command state.  
If the RDL signal is not acknowledged.  
&T7 INITIATE RDL WITH LOCAL SELF TEST (See Figure 5)  
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This is a system test, end to end.  
The command is valid only if the modems are in the command state with a  
connection established.  
Configure the remote modem with an AT&T4 command so that it will  
honor a remote digital loopback request.  
Enter AT&T7 at the local modem and it will send a digital loopback  
request to the remote modem. After the RDL acknowledgment signal is  
received from the remote modem, DSR is turned off (if &S1 is in effect),  
the on-line state is entered, an OK result code is sent to the DTE, and the  
test timer is set to the value in S18. While the test is active, the local  
modem sends a test message to the remote modem and counts the errors in  
the received (looped back) signal. The modems stay in the command  
state during the test. When the test is terminated (except by a loss of  
carrier), the local modem sends the release signal to the remote modem, as  
in &T6, and reports the three-digit error count to the DTE.  
The information text is followed by an OK result code. The test is  
terminated by loss of carrier, or an H0, &T0, or Z command, and by the  
S18 timer running out.  
RESULT CODES  
DESCRIPTION  
OK  
OK  
When command executed is started.  
After error count is sent to DTE (&T1,  
&T3, &T6, &T7 or &T8).  
ERROR  
ERROR  
If not in on-line command state.  
If the RDL signal is not acknowledged.  
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&T8 LOCAL LOOPBACK WITH SELF TEST (See Figure 6)  
The modem should be on hook. Enter AT&T8 to configure the modem  
for analog loopback and self test. The test timer is started at the time  
indicated by S18, DSR is turned off (if &S1 is in effect). A self test  
condition is entered, and an OK result code is sent to the DTE. During the  
test the modem sends a test message and counts errors in the looped  
back signal. The test is terminated when the timer times out (S18) or the  
&T0, H0, or Z command is issued. When the test is terminated, the three  
digit error count is sent to the DTE. An OK result code follows the error  
count.  
RESULT CODE  
DESCRIPTION  
OK  
If a test state is entered.  
OK  
ERROR  
After error count is sent to DTE  
If any other V.54 test is active (&T1, &T3,  
&T6, &T7), or if on-line.  
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ADDITIONAL TEST / DIAGNOSTICS COMMANDS...  
%L  
RECEIVED SIGNAL LEVEL  
Returns a value (-dBm) which indicates the received signal  
level at modem DATA PUMP interface. This value is  
determined by the loss/gain of modem Telco Interface circuit  
±dB at the Tip/Ring input to the modem. Typical value should  
be -25dBm to -35dBm for most Telco connections.  
%Q  
RECEIVED LINE SIGNAL QUALITY  
Reports the line signal quality at the modem DATA PUMP  
interface. This signal is also dependent on the DAA circuit  
(Telco Interface). Returns the higher order byte of the EQM  
(Eye Quality Monitor is the filter squared magnitude of the  
error vector). Typical value should be below 10. The lower the  
number, the better the performance from the modem.  
ERROR response if NO connection to remote modem.  
In &T1, modem %Q will be 0.  
S86  
CONNECTION FAILURE CAUSE  
S86 can help determine the cause of a connection failure.  
When the modem issues a NO CARRIER result code, a value is  
written to this register. To read this register, following the  
connection failure, issue ATS86? <CR>. The modem will  
report one of the following values...  
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0
4
5
Normal hang up; no error occurred.  
Physical carrier loss. (Loss of Carrier)  
Feature negotiation failed to detect presence of another V.42  
error-control modem at other end.  
6
7
Other error-control modem did not respond to  
feature negotiation message sent by this modem.  
Other modem is synchronous-only; this modem is  
asynchronous-only.  
8
Modems could not find a common framing technique.  
Modems could not find a protocol in common.  
Feature negotiation message sent by other modem incorrect.  
Synchronous information (data of flags) not received from  
other modem.  
9
10  
11  
12  
13  
Normal disconnect initiated by other modem.  
Other modem did not respond after many transmissions of the  
same message. Modem made 10 attempts then hung up.  
Protocol violation occurred.  
14  
15  
Compression failure.  
Note: Multiple occurrences may contribute to a NO CARRIER  
message; S86 records the first event that occurred.  
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NOTES:  
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