Nortel Networks Telephone RTU 292 User Manual

Installation and Operation Manual

RTU-292

RADIO / TELEPHONE

INTERFACE UNIT

Designed and Manufactured by:

JPS Communications, Inc.

5800 Departure Drive

Raleigh, NC 27616

e-mail: [email protected]

JPS P/N 5970-600200

Revision 1.62

July, 2005

JPS Communications, Inc.

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RTU-292 Operations Manual

Table of Contents

GENERAL INFORMATION ......................................................................................................................1 -1

SCOP E ....................................................................................................................................................1 -1

DESCRIPTION.......................................................................................................................................1 -1

GENERA L ......................................................................................................................................1 -1

ASSEMBLIES ........................................................................................................................................1 -2

MAIN BOAR D ...............................................................................................................................1 -2

FRONT PANEL SWITCH ASSEMBLIES ....................................................................................1 -3

OPTIONS INTERFACE BOAR D ..................................................................................................1 -3

OPTIONS........................................................................................................................................1 -5

INSTALLATIO N ..........................................................................................................................................2 -1

2.1

GENERA L ..............................................................................................................................................2 -1

UNPACKING AND INSPECTION .......................................................................................................2 -1

RESHIPMENT OF EQUIPMENT..........................................................................................................2 -1

INSTALLATION OVERVIEW .............................................................................................................2 -2

INSTALLATION CONSIDERATIONS ................................................................................................2 -2

FCC PART 68 REGULATIONS ....................................................................................................2 -2

POWER REQUIREMENT S ...................................................................................................................2 -4

INPUT POWER SELECTION ...............................................................................................................2 -4

LINE VOLTAGE SELECTION .....................................................................................................2 -4

DC INPUT POWER SELECTIO N .................................................................................................2 -4

CONFIGURING THE RTU-292 ............................................................................................................2 -5

PROGRAMMING MODE SETUP PARAMETERS .....................................................................2 -5

SETTING TELEPHONE SEND AND RECEIVE LEVELS..........................................................2 -5

VOX HANGTIME..........................................................................................................................2 -7

VOX SENSITIVITY.......................................................................................................................2 -7

BALANCED/UNBALANCED RADIO INTERFAC E ..................................................................2 -7

RX LINE INPUT IMPEDANCE ....................................................................................................2 -8

DIAL MODE ..................................................................................................................................2 -8

TELEPHONE RING VOLUM E .....................................................................................................2 -8

FULL/HALF DUPLEX RADI O .....................................................................................................2 -8

2.8.10 SERIAL PORT BAUD RAT E ........................................................................................................2 -9

2.8.11 RADIO CONTROL MODE............................................................................................................2 -9

2.8.12 PASSWORD PROTECTION .......................................................................................................2 -10

2.8.13 VOICE PROMPTS .......................................................................................................................2 -10

2.8.14 LOCAL PHONE / LOCAL PHONE RING-THROUGH .............................................................2 -10

2.8.15 TRANSMIT LEVEL SET-UP MODE..........................................................................................2 -11

2.8.16 MISCELLANEOUS JUMPER S ...................................................................................................2 -11

2.9

INTERCONNECT INFORMATION ...................................................................................................2 -11

TELEPHONE CONNECTION..................................................................................................... 2-12

RADIO CONNECTION ...............................................................................................................2 -12

HANDSET CONNECTOR...........................................................................................................2 -13

TERMINAL BLOCK....................................................................................................................2 -14

RS-232 CONNECTION................................................................................................................2 -15

2.10 AUDIO LEVEL SETUP AND ADJUSTMENTS ................................................................................2 -15

2.10.1 SETTING THE TRANSMIT LEVEL...........................................................................................2 -15

2.10.2 SETTING THE RECEIVE LEVE L ..............................................................................................2 -16

2.11 INSTALLATION CHECKLIST...........................................................................................................2 -24

2.12 OPTIONS INSTALLATION AND CONFIGURATION.....................................................................2 -24

OPERATION ................................................................................................................................................3 -1

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3.1

3.2

3.2.1

GENERAL ..............................................................................................................................................3-1

FRONT PANEL CONTROLS, INDICATORS AND CONNECTOR S .................................................3-1

MAIN POWER SWITCH ...............................................................................................................3-1

HEADPHONE JACK......................................................................................................................3-1

HANDSET JACK ...........................................................................................................................3-1

HANDSET ......................................................................................................................................3-1

SPEAKER .......................................................................................................................................3-1

KEYPAD.........................................................................................................................................3-2

SPEAKER VOLUME CONTROL..................................................................................................3-2

PHONES VOLUME CONTROL....................................................................................................3-2

TEL LINE BUTTONS ....................................................................................................................3-2

3.2.10 HANDSET BUTTON S ...................................................................................................................3-2

3.2.11 SPEAKER BUTTON S ....................................................................................................................3-3

3.2.12 TEL VO X ........................................................................................................................................3-3

3.2.13 AUTO ANS BUTTON....................................................................................................................3-3

3.2.14 AUDIBLE RING BUTTON............................................................................................................3-3

3.2.15 KEY PUSHBUTTON .....................................................................................................................3-3

3.2.16 PEAK LED......................................................................................................................................3-3

3.3

REAR PANEL CONNECTOR S .............................................................................................................3-4

P1 RADIO CONNECTOR..............................................................................................................3-4

J1 TEL LIN E ...................................................................................................................................3-4

TERMINAL BLOC K ......................................................................................................................3-4

J2 LOCAL PHONE CONNECTOR................................................................................................3-4

P2 RS-232 CONNECTOR .............................................................................................................3-4

DC INPUT TERMINAL BLOCK...................................................................................................3-4

P1 AC POWER CONNECTO R .....................................................................................................3-4

OPERATION ..........................................................................................................................................3-5

OPERATION OVERVIEW ............................................................................................................3-5

USE OF THE RTU-292 SPEAKER TO MONITOR AUDIO ........................................................3-5

PLACING A TELEPHONE CALL.................................................................................................3-5

RECEIVING A TELEPHONE CALL ............................................................................................3-6

PUTTING A TELEPHONE CALL ON HOL D ..............................................................................3-6

USING THE HANDSET WITH THE RADI O ...............................................................................3-6

CONNECTING THE RADIO TO THE TELEPHONE LINE........................................................3-6

MANUAL PHONE PATCH PROCEDURE...................................................................................3-7

TRANSMITTER KEYING, HALF DUPLEX SYSTEM ...............................................................3-8

3.4.10 TRANSMITTER KEYING, FULL DUPLEX SYSTEM................................................................3-9

3.5

3.6

3.7

REMOTE KEY .......................................................................................................................................3-9

SELF TES T .............................................................................................................................................3-9

AUTOMATED OPERATION ................................................................................................................3-9

TONE PROMPTS ...........................................................................................................................3-9

VOICE PROMPTS........................................................................................................................3-10

CALLING THE RTU-292 VIA THE OUTSIDE LINE................................................................3-10

PLACING A CALL IN THE COMMAND MODE:.....................................................................3-12

TERMINATING A CALL :...........................................................................................................3-12

DTMF CONTROL COMMANDS................................................................................................3-13

RTU-292 PASSWORD PROTECTION .......................................................................................3-16

INACTIVITY DISCONNECT TIMER ........................................................................................3-16

CALLING TIME R ........................................................................................................................3-16

3.7.10 USING THE RTU-292 SPEED DIAL FEATURE .......................................................................3-17

3.7.11 OPTIONAL 4 WIRE OPERATION .............................................................................................3-18

3.8

3.9

FACTORY RESE T ...............................................................................................................................3-18

SPEED DIAL RESE T ...........................................................................................................................3-18

RTU-292 THEORY OF OPERATION .....................................................................................................4-19

4.1 GENERAL ............................................................................................................................................4-19

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4.2

4.3

4.3.1

FRONT PANEL BUTTONS AND INDICATORS..............................................................................4 -19

MAIN BOAR D .....................................................................................................................................4 -19

AUDIO BUS ARRANGEMENT..................................................................................................4 -19

TELEPHONE INTERFACE CIRCUITS......................................................................................4 -20

RADIO INTERFACE CIRCUIT S ................................................................................................4 -21

HANDSET/ SPEAKER INTERFACE.........................................................................................4 -22

DSP MODULE .............................................................................................................................4 -22

DSP SOFTWAR E .........................................................................................................................4 -22

POWER SUPPL Y .........................................................................................................................4 -24

CPU...............................................................................................................................................4 -24

PROMPT TONE GENERATO R ..................................................................................................4 -25

OPTION INTERFACE BOARD ..........................................................................................................4 -25

VOICE PROMPT OPTIO N ..................................................................................................................4 -25

SPEECH PROCESSO R ................................................................................................................4 -25

CONTROL PROCESSO R ............................................................................................................4 -25

VOICE PROMPT SOFTWARE ...................................................................................................4 -26

LOCAL PHONE OPTION ...................................................................................................................4 -26

INTERFACE CIRCUITRY ..........................................................................................................4 -26

DIAL/BUSY GENERATORS ......................................................................................................4 -26

LOCAL TELEPHONE LINE INTERFACE.................................................................................4 -26

REMOTE CONTROL PROTOCO L ..........................................................................................................5 -1

5.1

5.2

5.3

GENERA L ..............................................................................................................................................5 -1

RS-232 REMOTE CONTROL OVERVIEW .........................................................................................5 -1

COMMANDS SENT TO THE RTU-29 2 ...............................................................................................5 -1

NULL Command ............................................................................................................................5 -3

Auto Answer Command..................................................................................................................5 -3

Audible Ring Command..................................................................................................................5 -3

Date Command................................................................................................................................5 -4

Dial Command ................................................................................................................................5 -4

Disconnect Command .....................................................................................................................5 -5

DTMF Comman d ............................................................................................................................5 -5

Handset Phone Command ...............................................................................................................5 -6

Handset Radio Command................................................................................................................5 -6

5.3.10 Speaker Phone Command ...............................................................................................................5 -7

5.3.11 Speaker Radio Command................................................................................................................5 -7

5.3.12 Speed Dial Command......................................................................................................................5 -8

5.3.13 Tel-Line Phone Command ..............................................................................................................5 -9

5.3.14 Tel-Line Radio Command...............................................................................................................5 -9

5.3.15 Time Command.............................................................................................................................5 -10

5.3.16 Software Version Command .........................................................................................................5 -10

5.4

STATUS RETURNED FROM THE RTU-292 ....................................................................................5 -11

NULL Response............................................................................................................................5 -12

Auto Answer Respons e .................................................................................................................5 -12

Call Starting Response ..................................................................................................................5 -12

Dial Response................................................................................................................................5 -13

Disconnect Response ....................................................................................................................5 -13

DTMF Response ...........................................................................................................................5 -13

Elapsed Time Response ................................................................................................................5 -14

Handset Phone Response ..............................................................................................................5 -14

Handset Radio Response...............................................................................................................5 -14

5.4.10 Speaker Phone Response...............................................................................................................5 -15

5.4.11 Speaker Radio Respons e ...............................................................................................................5 -15

5.4.12 Speed Dial Response.....................................................................................................................5 -16

5.4.13 Tel-Line Phone Response..............................................................................................................5 -16

5.4.14 Tel-Line Radio Respons e ..............................................................................................................5 -16

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5.4.15 Time/Date Response......................................................................................................................5-17

5.4.16 Version Respons e ..........................................................................................................................5-17

5.5

5.6

CALL PROGRESS RESPONSES FROM THE RTU-292 ...................................................................5-18

RESPONSE ERROR CODES...............................................................................................................5-18

MAINTENANCE AND REPAIR ..............................................................................................................6-19

GENERAL ............................................................................................................................................6-19

PREVENTIVE MAINTENANCE ........................................................................................................6-19

REPAIR OR REPLACEMENT ............................................................................................................6-19

GENERAL PRECAUTIONS AND NOTES.................................................................................6-19

ALIGNMENT .......................................................................................................................................6-19

PERFORMANCE TESTIN G ................................................................................................................6-19

TEST EQUIPMENT REQUIRED ................................................................................................6-19

HYBRID BALANCE MEASUREMENT.....................................................................................6-20

VOX SENSITIVITY MEASUREMENT......................................................................................6-23

RTU-292 OPTIONS ......................................................................................................................................7-1

7.1

GENERAL ..............................................................................................................................................7-1

Special Software Versions...............................................................................................................7-1

VOICE PROMPT OPTION ....................................................................................................................7-2

INSTALLATION AND CONFIGURATION.................................................................................7-2

OPERATION ..................................................................................................................................7-2

LOCAL PHONE OPTION......................................................................................................................7-4

LOCAL PHONE OPTION INSTALLATION AND CONFIGURATION.....................................7-4

LOCAL PHONE OPTION OPERATION ......................................................................................7-5

VMM-100 OPTIO N ................................................................................................................................7-6

VMM-100 Hardwar e .......................................................................................................................7-6

VMM-100 Software ........................................................................................................................7-7

VMM-100 INSTALLATION AND CONFIGURATION...............................................................7-7

DTMF ACCESS OPTION ....................................................................................................................7-11

Initiate Call Via Attention Signal ..................................................................................................7-11

RTU-292 Response to Attention Signal ........................................................................................7-11

Radio Caller Provides Calling Directions......................................................................................7-11

RTU-292 Plays Back Phone Number & Prompts for Confirmation..............................................7-11

RTU-292 Places the Cal l ...............................................................................................................7-11

After the Call Begin s .....................................................................................................................7-12

SQUELCH BREAK ACCESS OPTION...............................................................................................7-13

Initiate Call Via Attention Signal ..................................................................................................7-13

RTU-292 Response to Attention Signal ........................................................................................7-13

RTU-292 Prompts for Confirmation .............................................................................................7-13

RTU-292 Places the Cal l ...............................................................................................................7-13

After the Call Begin s .....................................................................................................................7-13

THE CALL LOGGING OPTIO N .........................................................................................................7-14

Checking The Time And Date.......................................................................................................7-14

Setting The Tim e ...........................................................................................................................7-14

Setting The Dat e ............................................................................................................................7-14

Call Logging..................................................................................................................................7-14

RADIO CONTROL OPTIO N ...............................................................................................................7-15

CONTROLLING THE RADIO VIA THE RTU-292 FRONT PANEL KEYPAD.......................7-15

SCHEMATIC DIAGRAMS .........................................................................................................................8-1

8.1

GENERAL ..............................................................................................................................................8-1

INDE X ............................................................................................................................................................9-1

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List Of Figures

O UTLINE D IMENSIONS ...................................................................................................................2 -18

C ONTROL AND C ONNECTOR L OCATIONS .......................................................................................2 -19

L OCATION O F I NTERNAL O PTION S ETTINGS ..................................................................................2 -20

I NTERNAL O PTION S ETTING D ETAILS ............................................................................................2 -21

A UDIO I NTERFACE W IRING D IAGRAM ...........................................................................................2 -22

I NTERFACE D ETAILS ......................................................................................................................2 -23

H YBRID B ALANCE T EST S ET -U P ....................................................................................................6 -21

VOX S ENSITIVITY T EST S ET -U P ...................................................................................................6 -23

V OICE P ROMPT O PTION I NSTALLATION ...........................................................................................7 -3

L OCAL P HONE O PTION I NSTALLATION .............................................................................................7 -5

VMM-100 O PTION I NSTALLATION ..................................................................................................7 -8

F RONT P ANEL S CHEMATIC ...............................................................................................................8 -1

M AIN B OARD S CHEMATIC ...............................................................................................................8 -1

DSP M ODULE ..................................................................................................................................8 -1

O PTION I NTERFACE B OARD .............................................................................................................8 -1

V OICE P ROMPT O PTION B OAR D .......................................................................................................8 -1

L OCAL P HONE O PTION B OARD ........................................................................................................8 -1

VMM-100 O PTION B OARD ..............................................................................................................8 -1

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List of Tables

E QUIPMENT AND A CCESSORIES S UPPLIED ....................................................................................1-4

O PTIONAL E QUIPMENT - N OT S UPPLIED ........................................................................................1-5

RTU-292 SPECIFICATIONS .......................................................................................................1-6

RTU-292 F ACTORY D EFAULT S ETTING S .......................................................................................2-3

R ECOMMENDED P HONE L INE S ETTINGS ........................................................................................2-6

T ELEPHONE S END /R ECEIVE L EVEL S ..............................................................................................2-6

VOX H ANGTIME ..............................................................................................................................2-7

VOX S ENSITIVITY ...........................................................................................................................2-7

D IAL M ODE ......................................................................................................................................2-8

F ULL /H ALF D UPLEX .........................................................................................................................2-9

B AUD R ATE ......................................................................................................................................2-9

R ADIO C ONTROL M ODE ...................................................................................................................2-9

T ABLE 2-10 P ASSWORD P ROTECTION ..............................................................................................................2-10

T ABLE 2-11 V OICE P ROMPTS E NABLE .............................................................................................................2-10

T ABLE 2-12 L OCAL P HONE E NABLE .................................................................................................................2-11

T ABLE 2-13 L OCAL P HONE R INGTHROUG H ......................................................................................................2-11

T ABLE 2-14 TX L EVEL S ET -UP M OD E ..............................................................................................................2-11

T ABLE 2-15 J1 - TEL LINE (RJ-11C).............................................................................................................2-12

T ABLE 2-16 P1-RADIO (DB-9 M ALE ) ............................................................................................................2-13

T ABLE 2-17 J7 - HANDSET (RJ12C J ACK )...................................................................................................2-13

T ABLE 2-18 T ERMINAL B LOCK (6 P OSITION )....................................................................................................2-14

T ABLE 2-19 P2 – RS-232 C ONNECTOR (DB-9 M ALE )...................................................................................2-15

T ABLE 2-20 I NSTALLATION C HECKLIST .............................................................................................................2-24

S TANDARD DTMF O PERATIONAL C OMMANDS ............................................................................3-14

P ROGRAMMING M ODE DTMF C OMMANDS ..................................................................................3-15

C OMMAND S UMMAR Y ......................................................................................................................5-2

R ESPONSE S UMMAR Y ...................................................................................................................5-11

C ALL P ROGRESS R ESPONSES ......................................................................................................5-18

R ESPONSE E RROR C ODES ...........................................................................................................5-18

F AULT A NALYSIS ...........................................................................................................................6-24

RTU-292 O PTIONS ..........................................................................................................................7-1

V OICE P ROMPTS E NABLE ...............................................................................................................7-2

L OCAL P HONE E NABLE ...................................................................................................................7-4

L OCAL P HONE R INGTHROUG H ........................................................................................................7-4

L OCAL P HONE DTMF C OMMAND S .................................................................................................7-5

VMM-100 SPECIFICATIONS .....................................................................................................7-9

VMM-100 I/O CONNECTOR INFORMATION (P9 )...............................................................7-10

VMM-100 S WITCH F UNCTIONS ....................................................................................................7-10

DTMF R ADIO C ONTROL C OMMAND S ...........................................................................................7-16

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Glossary

Adaptation

COR

The process whereby the RTU-292 DSP algorithms detect reflected signal information in a

connected line and tune the DSP hybrid for a broadband null with minimum reflection.

Carrier Operated Relay - A receiver signal that gives a positive indication that a carrier or signal

is being received and that the receiver is unsquelched. Same as COS.

COS

Carrier Operated Squelch - See COR.

CTCSS

Continuous Tone Controlled Squelch System. A squelch system using EIA Standardized sub-

audible tones in the 67Hz to 250Hz frequency range. An FM squelch which opens only when

the proper sub-audible tone is present.

DIP Switch

Dual In-Line Package Switch (Also “dipswitch”)- A multi-unit switch that fits into a standard

DIP integrated circuit footprint. It usually contains eight or ten individual switches.

DTMF

DSP

Dual Tone Multi Frequency - The standard touch-tone telephone dialing method.

Digital Signal Processing (or Processor).

EIA

Electronic Industries Association.

Full Duplex

A communications system that can operate in transmit mode and receive mode simultaneously,

with different frequencies for transmit and receive. See also Half Duplex and Simplex.

Half Duplex

Hangtime

A communications system that uses different frequencies for transmit and receive operation, but

can not transmit and receive at the same time. See also Full Duplex and Simplex.

A system with hangtime will remain in the transmit mode for the duration of the set hangtime

beyond the time indicated by any keying inputs. The hangtime prevents transmitter unkey

during brief pauses in the transmission.

Key

To key a transmitter means to cause it to transmit.

Light Emitting Diode.

LED

LMR

Mute

PCB

PTT

Land Mobile Radio.

To quiet or inhibit audio.

Printed Circuit Board.

Push-to-Talk. An active PTT signal causes a transmitter to key.

Receiver or Receiving.

Simplex

A communications system that uses the same frequencies for both transmit and receive

operation. A simplex system can obviously not transmit and receive simultaneously. See also

Full Duplex and Half Duplex.

SNR

Signal-to-Noise Ratio.

Squelch

A means of detecting audio and causing some action when it is present, such as keying a

transmitter or unmuting an audio path.

Transmit or Transmitter.

VMR

Voice Modulation Recognition. A type of squelch, which is activated only by spoken words and

not by tones, noise, or other audio information.

VOX

Voice Operated Xmit (Transmit). A circuit or algorithm that causes a transmitter to key or some

other action when voice or other signal is present. This squelch type is activated by any audio

signal, and is not restricted to voice only.

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1 General Information

1.1 SCOPE

This instruction manual provides the information necessary to install, operate, repair and

maintain the RTU-292 Radio/Telephone Interface.

1.2 DESCRIPTION

1.2.1 GENERAL

The RTU-292 Radio/Telephone Interface Unit will provide a trouble-free automatic connection

between a radio system and telephone or other two-wire line. The unit is suited for use with

HF, VHF, UHF or satellite systems and is applicable to full or half-duplex modes. The RTU-

292 incorporates a full-featured telephone set and monitor speaker. Flexible switching allows

many operating scenarios.

The RTU-292 replaces the JPS Communications RTU-282. The RTU-292 contains all of the

features and capabilities of the RTU-282, along with some major improvements. The new DSP

used in the RTU-292 allows improved Call Progress Detection. Additional circuitry on the

Main Board provides the ability to detect line reversal when a telephone caller hangs up the

phone, allowing immediate call termination when used with phone systems that have Reverse

Battery Signaling. A new standard feature with the RTU-292 is RS-232 control of the unit. A

new optional feature is DTMF Access of the system via radio.

A front panel keypad allows DTMF or Pulse dialing and the built-in handset is pushbutton-

selectable for communication with either the telephone or the radio. Since the telephone may

place and receive calls, the operator can quickly and easily establish a phone patch connection.

When used in the manual mode, the RTU-292 patches a telephone into a radio link by

essentially the same method as with a conventional phone patch; the quality of the patch,

however is greatly improved. First, a radio-to-radio link is established. Then, using the

telephone in the RTU-292, the operator places a phone call to the distant telephone that will be

patched into the radio link. Once the telephone-to-telephone link is made, the operator simply

pushes a front panel pushbutton. The RTU-292 adapts to the phone line, and the distant phone

becomes part of a telephone-to-radio-to-radio communications link. Once this link is

established, the operator may communicate with either party using the RTU-292’s handset, and

may monitor both sides of the conversation with the speaker.

The RTU-292 uses a unique adaptive hybrid implemented with a DSP (Digital Signal

Processor) to eliminate conventional VOX and hybrid adjustments for a quick and simple set-

up. The unit works by measuring the characteristics of the telephone line. A short burst of

white noise is placed on the telephone line. During this burst, the adaptive hybrid in the unit

measures the signal reflected from the phone line and adapts the RTU-292 to the impedance of

the phone line, minimizing the reflected signal. This achieves a broadband hybrid balance on

the reactive phone line. This is simply not possible with any type of conventional active or

passive hybrid. Not only is a deep, broadband null provided, but also the action is completely

1-1

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automatic. The unit will continuously adapt to changing line conditions, making operation

insensitive to line impedance changes.

In the Automated Operations mode, the RTU-292 combines the unique features of its adaptive

DSP hybrid with fully unmanned auto-dial/auto-answer capability.

In its standard

configuration, the unit uses tone prompts to signal the remote user of the operations that must

be performed to control the unmanned radio station. The addition of a Voice Prompt Option

supplies a large number of spoken prompts to simplify control. The Local Phone Option allows

a standard telephone set to be plugged into the rear panel of the RTU-292; this local phone may

then be used in place of the unit's keypad and handset.

Input and output levels are internally adjustable to accommodate all types of radio systems. A

set-up mode allows the adjustment of the RTU-292 receiver and transmitter signal levels

without any external test equipment.

The unit will interface all types of two-wire lines, such as normal dial-up lines, dedicated lines,

or twisted-pair field wire. Although the output impedance is fixed at 600 Ohms, the adaptive

hybrid in the unit will give excellent hybrid balance regardless of the impedance of the line

connected to the unit.

The unit operates from 115 or 230 VAC, 47 to 63 Hz, or from +12 or +24/+28 VDC nominal;

the +12VDC range extends from +11 to +15 VDC, while the +24/+28 VDC range extends from

+22 to +30 VDC. It is packaged in a rugged enclosure measuring 3.5"H x 19"W x 12"D. All

inputs and outputs, including those for power, are filtered or protected as appropriate to enable

the RTU-292 to meet the requirements of FCC Part 15 rules for a Class A Digital Device.

1.3 ASSEMBLIES

The standard RTU-292 contains five PC board assemblies; the main board (with plug-on

adaptive hybrid DSP board), three front panel switch PC board assemblies, and the Options

Interface Board, which is mounted in the Options Tray where other option boards may be

installed. Mounted on the front panel along with the switchboards are a speaker, control

potentiometers, phone jack and handset jack. The various I/O connectors and the DC power

input connector are accessible via the rear panel.

1.3.1 MAIN BOARD

The main board has six general sections of circuitry: the Telephone Interface section,

Handset/Speaker Interface section, Radio Interface section, DSP section, CPU section, and

Power Supply section. These are described briefly in the following paragraphs. Refer to the

RTU-292 block diagram along with the text. (The power supply and DSP sections are not

shown in the block diagram, refer to Section 4 for more details.)

1.3.1.1 Telephone Interface

The Telephone Interface Section has the amplifiers that drive and receive audio from the phone

line. This section also contains the DSP hybrid (which is detailed in Section 4 of this manual),

interfaced with the keypad. A tone ringer generates a warble audio tone when ring voltage is

received.

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1-2

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1.3.1.2 Handset/Speaker Interface

The Handset/Speaker Interface Section contains the speaker pre-amp and driver, the headphone

pre-amp and driver. Audio gates controlled by the front panel switches route the audio to the

speaker and handset microphone preamplifier and ALC (Automatic Level Control) circuit.

1.3.1.3 Radio Interface

The Radio Interface Section consists of operational amplifier circuits that handle the audio

interfaces between the RTU-292 and the radio. The amplifiers provide gain adjustability to

accommodate various input and output levels, and also provide impedance transformation and

output drive capability. Audio gates controlled by the front panel switches and the CPU route

the audio as desired by the operator.

1.3.1.4 DSP Module

The plug-in Digital Signal Processor (DSP) module is the heart of the unit, as the adaptive

hybrid is implemented with the DSP. From a hardware standpoint, the DSP section consists of

a DSP chip interfaced with dual analog interface ICs, static RAM for audio storage and delay,

and a program flash memory IC.

From a software standpoint, the following functions are implemented in software in the DSP

section: the adaptive hybrid, the VOX, an audio peak detector, the noise generator for

measuring the telephone line characteristics, an audio delay and the transmit setup tone

generator.

1.3.1.5 CPU Section

This section contains the microprocessor and program software that controls all operations of

the RTU-292. Various I/O devices read external inputs and the front panel controls. The

inputs are processed and audio gates, front panel LEDs, audio prompts, etc., are controlled

accordingly.

1.3.1.6 Power Supply Section

The power supply in the RTU-292 is a quiet and reliable passive regulator type. It furnishes

regulated voltages of +12V, -12V, +5V and -5V to the unit.

1.3.2 FRONT PANEL SWITCH ASSEMBLIES

There are three separate front panel switch assemblies that contain the pushbutton switches and

LED indicators for the RTU-292. Each of these assemblies contains a different complement of

components as required by its function. Signals from the switches are read by the CPU

circuitry on the main board. The processor then routes audio signals and lights the front panel

LEDs according to the pushbutton commands.

1.3.3 OPTIONS INTERFACE BOARD

This board, located on the Options Tray above the main board, contains the connectors used to

interface the main board to the various option boards that may be assembled to the Options

Tray.

1-3

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Table 1-1

Equipment and Accessories Supplied

Qty

Part Number

5970-600000

Item

RTU-292 Standard

5970-600200

5970-600150

Operation & Maintenance Manual

Accessory Kit

Consists of:

Qty

Part Number

Item

0150-200000

Handset, PTT, black

0313-037770

0313-060000

0360-009000

0650-005100

0650-010100

0827-000001

0827-102401

Cable, misc., power w/3-wire connector

Cord, coiled, black (for handset)

Connector, cable, DB-9 receptacle

Fuse, 3AG, 1/2A, slow blow

Fuse, 3AG, 1A, slow blow

HW, clamp, cable, for DB-9 connector

HW, Telephone Hanger; may be attached to front panel

(holes provided)

0833-063205

0837-103200

0848-100001

HW, screw, flat head, 6-32 x 5/16”, 100 degrees,

(spares for top cover mounting)

HW, screw, truss head, #10-32x3/8, for mounting unit front

panel to rack (includes one spare)

HW, washer, flat, nylon (#10 by ½” diameter by 1/16”

thick), for mounting unit front panel to rack (includes one

spare)

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1.3.4 OPTIONS

RTU-292 options include the: The Voice Prompt Option, which gives verbal prompts to the

user as an aid in all aspects of unit operation; The Local Phone Option, which allows a DTMF

telephone set to be plugged into the unit, allowing control and access from the phone set; and

the VMM-100 module, used to add VMR (Voice Modulation Recognition) and DSP noise

reduction capability. Among the Software Options are the Squelch Break Access Option,

which allows a radio to contact the system via series of squelch breaks and the DTMF Access

Option, which allows a radio user to contact the system via a DTMF keypad. Other Software

Options include Call Logging and Remote Control of an URC-200 radio. Various spares kits

are also available. The STU-III option allows a STU-III phone to be connected to the RTU-

292. This allows an encrypted STU-III conversation to be decrypted at the RTU-292. The

decrypted signal is patched into the connected radio system.

Table 1-2

Optional Equipment - Not Supplied

Item

Depot Spares Kit

Spare PC Board Kit

Spare Parts Kit

JPS P/N

5970-691000

Description

Spares for 3 to 5 RTU-292s

Spare Boards for 1 unit

Spares for one RTU-292

5970-692000

5970-693000

5930-596000

Local Phone Option

Allows remote operation of the RTU-292 through the use of

a standard telephone set connected directly to the RTU-292

Local Phone port. (Telephone set and cable not supplied.)

DTMF Telephone Set

Voice Prompt Option

VMM-100 Option

5930-599000

5930-595000

5930-591100

Telephone set for use with the Local Phone Option

Standard Version (English, female voice)

Provides DSP Voice Modulation Recognition squelch and/or

DSP Noise Reduction to the radio RX input.

STU-III Option

Rack Slides Kit

5960-796000

5930-594000

Allows connection to a STU-III phone

1 set slides and hardware to rack-mount one RTU-292.

Software Options

Call Logging S/W Option

Radio Control Option

Squelch Break Access

DTMF Access Option

5970-791500

5970-795000

5970-791300

5970-799000

Provides record of calls via RS-232 interface.

Provides remote control of URC-200 radio via RS-232 int.

Allows radio connection via series of squelch breaks

Allows radio connection via DTMF keypad.

1-5

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Table 1-3

RTU-292 SPECIFICATIONS

TELEPHONE LINE INTERFACE (J2, Male DB-9 Connector)

Output & Input Levels to Phone Line

Frequency Response

Nominally -12 dBm. (Adjustable -21 to 0 dBm in 3 dB steps).

+2 dB, 300 to 3200 Hz.

Output Impedance to Phone Line

VOX Sensitivity

600 Ohm .

16 +2 dB Below Phone Line Input Level Setting.

(-25 dBm @ -9 dBm Level Setting, for example)

0.6 Second or 2.0 Seconds, (Internally Settable).

-30 dB over 300 to 3200 Hz BW within 1.25 Sec.; measured with

white noise source.

VOX Hang Time

Hybrid Balance/Adaptation Speed

(into 600 Ohm)

Ultimate Hybrid Balance (into 600 Ohm)

-50 dB typical over 300 to 3200 Hz BW; measured with a single

tone.

Hybrid Impedance Matching Capability

Phone Line Connections

0 to 10k Ohm Complex Impedance.

RJ11C Connector (J1) and screw terminals on rear panel term

block.

RADIO INTERFACE (J1, Male DB-9 Connector)

Input Impedance

Input Level

Output Impedance

Output Level

Frequency Response

Key Relay Output

TELEPHONE

Balanced or Unbalanced 600 Ohm or Unbalanced 47K Ohm.

-40 to +10 dBm, Internally Adjustable.

600 Ohm balanced.

-40 to +10 dBm, Internally Adjustable

300 to 3200 Hz + 2 dB.

Low Level Relay Contacts, 60VA max., Switching Speed: 5 msec.

Handset (RJ12C Jack)

Dialing Modes

Electret microphone, dynamic receiver.

DTMF, Pulse at 10 pps

Pulse Dial Make/Break Ratio

Dialing Keypad

40/60.

3x4, Standard Telephone Layout.

GENERAL

Microphone Interface

Headphone Interface

Phones Jack (monaural)

Speaker Driver Power

Internal Speaker

ALC (Automatic Level Control) with 30 dB dynamic range.

Drives high, medium, or low impedance headphones.

Delivers NLT 10mW into 600-Ohm headphones.

4W min @ 10% Distortion.

3 inch square, 3.2 Ohms.

Indicators

Front Panel Controls

Peak Level, Keyed, and Indicator for each pushbutton.

Power Switch, Dialing Keypad, Speaker and Handset Volume

Controls, Pushbuttons: Tel Line/Phone, Tel Line/Radio, Off,

Handset/Phone, Handset/Radio, Speaker/Phone, Speaker/Radio,

Tel VOX, Manual Key, Auto Answer, Audible Ring.

115 or 230 VAC +/- 15%, 47-63 Hz, 20 VA typical, 50 VA max.

+11 to +15VDC or +22 to +30VDC, 1 A Maximum.

3.5"H x 19"W x 10"D (8.9 x 48.3 x 25.4 cm)

12 lbs. (5.5 kg).

AC Input Power

DC Input Power

Size

Weight

ENVIRONMENTAL

Operating Temperature

Storage Temperature

Humidity

-20⁰C to +55⁰C.

-40⁰C to +85⁰C.

Up to 95% @ 55⁰C.

Shock

Vibration

MIL-STD-810D, method 516.3 procedure VI.

MIL STD 810D, method 514.3 Category I.

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2 Installation

2.1 GENERAL

This section provides the instructions for unpacking, inspection, installation and set-up. Also

included are directions for reshipment of damaged parts or equipment.

2.2 UNPACKING AND INSPECTION

After unpacking the unit, retain the carton and packing materials until the contents have been

inspected and checked against the packing list. If there is a shortage or any evidence of

damage, do not attempt to use the equipment. Contact the carrier and file a shipment damage

claim. A full report of the damage should also be reported to the JPS Customer Service

Department. The following information should be included in the report:

1. Order Number

2. Equipment Model and Serial Numbers

3. Shipping Agency

4. Date(s) of Shipment

The JPS Customer Service Department can be reached by phone at (919) 790-1011, by fax at

(919) 790-1456. Upon receipt of this information, JPS will arrange for repair or replacement of

the equipment.

2.3 RESHIPMENT OF EQUIPMENT

If it is necessary to return the equipment to the manufacturer, a Returned Material

Authorization (RMA) number must first be obtained from JPS. This number must be noted on

the outside of the packing carton and on all accompanying documents. When packing the unit

for reshipment, it is best to use the original packaging for the unit; if this is not possible, special

attention should be given to providing adequate packing material around connectors and other

protrusions, such as front panel controls. Rigid cardboard should be placed at the corners of the

unit to protect against corner damage during shipment. Failure to protect the corners of the

front panel causes the most common type of shipping damage experienced on returned

equipment.

Shipment should be made prepaid consigned to:

JPS Communications, Inc.

Customer Service Department

5720M Capital Blvd.

Raleigh, North Carolina 27616

USA

Plainly mark with indelible ink all mailing documents as follows:

U.S. GOODS RETURNED FOR REPAIR

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Mark all sides of the package:

FRAGILE - ELECTRONIC EQUIPMENT

Inspect the package prior to shipment to be sure it is properly marked and securely wrapped.

2.4 INSTALLATION OVERVIEW

Follow these four steps to properly install the RTU-292:

1. Provide mechanical mounting for the unit. (Rack slides or shelves are required for 19" rack

mounting)

2. Provide the proper primary power for the unit.

3. Interconnect the unit with the radio and system as appropriate.

4. Check Section 2.8 to ensure that the unit is adjusted and configured as desired.

The RTU-292 is then ready to begin normal operation.

2.5 INSTALLATION CONSIDERATIONS

Careful attention to the following installation suggestions should result in the best unit/system

performance. Figure 2.1 provides overall unit dimensions.

The RTU-292 must be installed in a structure that provides both protection from the weather

and assurance of ambient temperatures between -20 and +55 degrees C. Since the unit is

neither splashproof nor corrosion resistant, it must be protected from exposure to salt spray.

When the unit is mounted in a cabinet with other heat-generating equipment, the use of a rack

blower is suggested to keep the cabinet interior temperature rise to a minimum.

NOTE

Before actually installing the unit, read Section 2.8 to determine if any internal

configuration options must be changed that would necessitate removal of the unit’s

top cover.

The RTU-292 Radio/Telephone Interface is designed to be mounted in a standard EIA 19" wide

rack by means of chassis slides (may be ordered from JPS) or on an L-bracket shelf. The unit

weighs too much to be installed in a rack supported only by the front panel ears. Screws are

provided in the accessory kit for securing the unit to the rack via the front panel.

Included in the Accessory Kit is a handset hanger; this hanger may be assembled to the unit’s

front panel. Use the screws located below the logo and unit name. The hanger may also be

assembled to the side of an equipment rack or elsewhere as desired.

2.5.1 FCC PART 68 REGULATIONS

The RTU-292 has been designed to comply with FCC Part 68 regulations regarding equipment

connected to telephone lines, but is not officially certified. If tested compliance to FCC Part 68

is required, external equipment can be installed between the RTU-292 and the telephone line to

provide compliance.

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Table 2-1

RTU-292 Factory Default Settings

This table describes the settings of all RTU-292 internal adjustments and switch positions as set

when the unit is shipped.

Feature / Function

Telephone Send and Receive Levels

Dial Mode

Adjustment

SW2-1, 2,3

SW1-4

Default Setting

-9 dBm

DTMF

VOX Sensitivity

SW2-4, 5

Medium

VOX Hangtime

SW2-6

Long (2 second hangtime)

Half Duplex

Full/Half Duplex

SW2-8

RX Audio Interface

TX Audio Interface

Internal Audio Potentiometers

JP1, JP2

600 Ohms, Balanced

Midrange

JP3

R156, Ring Volume

R116, RX Lvl Adj

R133, TX Lvl Adj

SW1-1, 2

SW1-3

0 dBm input

0 dBm output

Serial Port Baud Rate

Spare

9600 Baud

Off

Password Protection

Voice Prompts Enable

Local Phone Enable

Local Phone Ring Through

SW1-5

Disabled

SW1-6

Enabled if Option Installed

SW1-7

SW1-8

DC Input Power Selection

(+12 or +24/28 VDC)

Internal Switch S6

+24/+28 VDC (nominal)

(+22 to +30 VDC)

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2.6 POWER REQUIREMENTS

The RTU-292 is designed to operate from 115V or 230V, 47 to 63 Hz, single phase AC power

source. The unit will meet all of its specifications over a voltage range of +15% from nominal.

Power consumption is 20 VA typical, 50 VA maximum.

Alternatively, the unit may be operated from a (nominal) +12, +24, or +28 VDC supply. At the

+12VDC setting, the unit will operate from +11 to +15VDC, and at the +24/+28 VDC setting,

the unit will operate from +22 to +30 VDC. Slide switch S6 on the Main Board selects either

+12 or +24/+28 VDC.

2.7 INPUT POWER SELECTION

2.7.1 LINE VOLTAGE SELECTION

CAUTION

To prevent damage to the unit, check the power line voltage selection before

applying power. Also be certain that the unit is connected to a grounded outlet.

As shipped from the factory, the RTU-292 is normally set for the correct line voltage in the

area where it will be installed, but the voltage selection should be checked before initial

operation. The number visible through the window in the line power module (located on the

rear panel) indicates the nominal line voltage range in the following manner:

100 or 120 position: nominal 115V operation

220 or 240 position: nominal 230V operation

(The number will be easier to see if the clear fuse cover is slid to the left with the line cord

removed.) To change the voltage selection, remove the line power cord and slide the clear

plastic fuse cover to the left, exposing the fuse. Pull the small handle marked “Fuse Pull”,

rotate the handle to the left and remove the fuse. With the “Fuse Pull” handle to the left, pull

the voltage selector card from its slot and replace it with the desired operating voltage

appearing at the top left side. Rotate the “Fuse Pull” handle back to the right and snap the fuse

back into the metal clips.

The fuse should be either:

115V operation: 1 A time-delay fuse

230V operation: 1/2 A time-delay fuse

To replace a blown fuse, follow the same general procedure, except that the voltage selector

card need not be removed.

2.7.2 DC INPUT POWER SELECTION

Internal slide switch S6 is used to configure the RTU-292 to accept DC power from a (nominal)

+12 or +24/+28 VDC source. The +12/+28 VDC position will work with +24 VDC (nominal

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and +28 VDC (nominal) supplies. The unit will automatically switch over to the use of the DC

input when the AC source drops too low or is not available. Slide switch S6 on the Main Board

is used to select either +12 or +24/+28 VDC operation. S1 is located near the left front edge of

the Main Board; the +12V and +24/+28V switch positions are clearly marked on the board.

The RTU-292 is set in the factory to the +24/+28 VDC position.

2.8 CONFIGURING THE RTU-292

The RTU-292 factory default settings are listed in Table 2-1. The factory set-up will be correct

for most installations; explanations of each feature selection method or other adjustment are

provided for systems requiring different set-ups. If any setting must be changed, refer to Figure

2-3, “Internal Adjustments Locations”. Remove the top cover of the unit by removing the

Phillips-head screws around its edges.

NOTE:

Many of the RTU-292's operating parameters are set by internal eight-position

dipswitches SW1 and SW2.

These switches are read by the RTU-292

microprocessor only when the unit power is turned on. To change any dipswitch

controlled parameter, turn off the RTU-292, change the switch setting(s), and then

turn the unit power back on.

2.8.1 PROGRAMMING MODE SETUP PARAMETERS

Some of the RTU-292 setup options are selected by entering DTMF commands by a connected

telephone or Local Phone Option telephone set. Since these parameters are set after a

connection is made, they are detailed in section 3. See Table 3-2, “Programming Mode DTMF

Commands”.

2.8.2 SETTING TELEPHONE SEND AND RECEIVE LEVELS

The levels of the audio signal that are sent into (Send) and received from (Receive) the

telephone line are adjustable via SW2 switches 1 through 3 on the RTU-292 Main Board. The

levels are adjustable from -21 dBm (600 Ohm) to 0 dBm in 3 dB steps. The dipswitches

simultaneously set the Send and Receive levels.

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Table 2-2

Recommended Phone Line Settings

Type of System

Send & Receive Levels

-9 dBm

Dial-Up lines in a U.S. Domestic phone system

Dial-Up lines in most non-U.S. telephone systems

PBX Systems

-9 dBm

-12 dBm

Field Wire not connected to a telephone network

-6 dBm

When using the RTU-292 in a domestic U.S. dial-up telephone network, the MAXIMUM level

allowed into a telephone line at the subscriber end is -9 dBm. Putting more level into the line

than this will NOT increase performance, but will result in distortion, crosstalk into other

circuits and the telephone company may disconnect the call. When operating into a PBX

system, the level should be set at -12 dBm. Higher levels than these may be only used into

field wire or dedicated or private lines, which are KNOWN to accommodate higher levels.

The send and receive levels are set by SW2-1, 2,3 as follows:

Factory default settings are indicated by an asterisk *

Table 2-3

SW2-1

Telephone Send/Receive Levels

SW2-2

Off

SW2-3

Off

Level

Off

O dBm

-3 dBm

-6 dBm

-9 dBm *

-12 dBm

-15 dBm

-18 dBm

-21 dBm

Off

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2.8.3 VOX HANGTIME

The RTU-292 VOX circuitry holds the radio in the keyed state for a short time after the

telephone audio signal is no longer detected. This delay, called hangtime, ensures that the

VOX is not de-activated between syllables or during short pauses in speech. The standard

VOX hangtime duration is 2.0 seconds. Dipswitch SW2-6 allows the setting of 0.6 seconds

hangtime if required. The factory default setting, SW2-6 On, sets the VOX hangtime to the

longer 2.0 second setting, and SW2-6 Off sets it to 0.6 seconds.

Table 2-4

SW2-6

VOX Hangtime

Key Tone Detection

Short 0.6 seconds

Long 2 seconds *

Off

2.8.4 VOX SENSITIVITY

The RTU-292 VOX circuitry has four sensitivity levels; minimum, low, medium (factory

setting), and maximum. A higher setting will be more able to detect weak or noisy voice

signals, but will be more likely to false on ambient noise entering the telephone handset. A

lower setting will do the opposite. SW2-4 and SW2-5 control the unit’s VOX Sensitivity

levels:

Table 2-5

VOX Sensitivity

SW2-4

Off

SW2-5

VOX Sensitivity

Off

Min

Low

Off

Med *

Max

2.8.5 BALANCED/UNBALANCED RADIO INTERFACE

Internal jumper fields JP1 and JP3 set the unit for either a Balanced or Unbalanced audio

interface to the radio or other four-wire device connected to the J2 RADIO Connector. Set the

jumper plug across JP1 pins 2&3 for balanced input and across pins 1&2 for an unbalanced

Receive Audio input. Similarly, set the jumper plug across JP3 pins 2&3 for balanced TX

Audio output and across pins 1&2 for an unbalanced output. The factory setting for both input

and output is balanced.

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2.8.6 RX LINE INPUT IMPEDANCE

The factory setting for the Receive Line input impedance is 600 Ohms, but if a high input

impedance for bridging is needed, the impedance may be set to approximately 47k Ohm. To

set to high impedance, move the jumper plug at JP2 from pins 1&2 (low, 600 ohms) to pins

2&3 (high, 47k ohms).

2.8.7 DIAL MODE

The dialing mode of the RTU-292’s internal telephone is set by internal dipswitch SW1-4. The

dial mode choices are DTMF and 10pps Pulse. DTMF should always be used if the RTU-292

is interfaced with a touch-tone (DTMF) capable telephone line. Note that, even when set for

pulse dialing, the RTU-292 can still send DTMF tones onto the phone line to control automated

systems such as voice mail. After a call has been placed, the user may press either the star (*)

or pound (#) key. The RTU-292 will then produce DTMF tones in response to keypad presses

from either the front panel keypad or a connected local phone set. Once the current call is

terminated, the RTU-292 will revert to the pulse dialing mode.

Table 2-6

SW1-4

Dial Mode

Dial Mode Selection

DTMF *

Off

Pulse (10 pps)

2.8.8 TELEPHONE RING VOLUME

The telephone ringer volume may be set to a comfortable level with internal adjustment R156.

If the ambient noise level in the RTU-292’s location makes it necessary to change the ringer

volume, rotate R156 clockwise to increase the volume and counterclockwise to decrease it.

2.8.9 FULL/HALF DUPLEX RADIO

In full duplex operation, the RTU-292 will simultaneously send transmit audio to the radio and

take in its receive audio. In half duplex operation, the radio receive audio is muted while the

radio is keyed. This prevents a radio sidetone audio feedback loop in radios with sidetone

audio. This feedback loop hampers RTU-292 VOX operation. (Sidetone audio is transmit

audio that is internally routed back into the receive audio when the radio is keyed, allowing the

radio operator to hear his transmission.)

The Full/Half Duplex selection is set by dipswitch SW2-8. The factory setting is SW2-8 On,

for Half Duplex, preventing the feedback loop. To set to Full Duplex operation (receive audio

not muted during transmit), set SW2-8 to Off. For Simplex Systems, use the Half Duplex

setting.

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Table 2-7

SW2-8

Full/Half Duplex

Full Duplex

Off

Half Duplex *

2.8.10 SERIAL PORT BAUD RATE

Internal dipswitches SW1-1 and SW1-2 on the Main board configure the RS-232 baud rate of

the unit's serial port as shown in the table below. The factory setting is 9600 Baud.

Table 2-8

SW1-2

Baud Rate

SW1-1

Off

Baud Rate

300

Off

1200

Off

4800

9600 *

2.8.11 RADIO CONTROL MODE

Dipswitch SW1-3 enables the RTU-292 to be put into the Radio Control Mode via one of its

DTMF commands. In this mode the RTU-292 can be used to relay radio control commands via

its RS-232 port to a companion Motorola URC-200 radio. The factory default disables this

mode, with SW1-3 set to OFF. See also Tables 3-1 and 3-3.

Table 2-9

Radio Control Mode

SW1-3

Off

Radio Control

Disabled *

Enabled

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2.8.12 PASSWORD PROTECTION

Dipswitch SW1-5 enables or disables the RTU-292's password protection feature. Password

protection prevents unauthorized access to the system from the PSTN line when the RTU-292

is in the Automated Operation Mode. (See section 3.7 for a full explanation of Automated

Mode Operation and the use of the Password Protection Feature). The factory setting is

disabled, SW1-5 Off. To enable the password protection feature, turn SW1-5 On. The factory

default password is “1 2 3 4”, but may be changed to any number up to 10 digits long. See

Table 3-2.

Table 2-10

Password Protection

SW1-5

Off

Passwords

Disabled *

Enabled

2.8.13 VOICE PROMPTS

Dipswitch SW1-6 enables or disables the use of Voice Prompts in the RTU-292. This feature

should be enabled only if the Voice Prompt Option is installed. See section 3.7 for an

explanation of the Voice Prompt feature operation, and section 7.2 for field installation. The

factory default setting: disabled if the Voice Prompt Option is not installed and enabled if it is.

Table 2-11

Voice Prompts Enable

SW1-6

Off

Voice Prompts

Disabled

Enabled

2.8.14 LOCAL PHONE / LOCAL PHONE RING-THROUGH

Dipswitch SW1-7 enables or disables the RTU-292 Local Phone Option. This feature should

be enabled only if the Local Phone Option is installed. The factory setting is: Disabled (SW1-7

Off) if the Local Phone Option is not installed and enabled (SW1-7 On) if it is. See section 3.7

for an explanation of Local Phone Option operation, and section 7.3 for field installation

instructions.

SW1-8 enables the Local Phone Ring-Through feature. This causes the local phone to ring

whenever a call is received by the RTU-292 via the PSTN input. When disabled, the local

phone may still be used to send and receive calls, but will not ring when a call is received. Set

SW1-8 to On to enable Local Phone Ring-Through, and Off to disable this feature. This switch

should always be set to Off (disabled) when the Local Phone Option is not installed. The

factory setting is On (enabled) when the Local Phone Option is installed and Off (disabled)

otherwise.

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Table 2-12

Local Phone Enable

SW1-7

Off

Local Phone

Disabled

Enabled

Table 2-13

Local Phone Ringthrough

SW1-8

Off

Ringthrough

Disabled *

Enabled

2.8.15 TRANSMIT LEVEL SET-UP MODE

Dipswitch SW2-7 is used by the factory to enable a special set-up mode. See section 2.10 for

instructions. This switch must remain Off (Normal Mode) for standard operation.

Table 2-14

TX Level Set-up Mode

SW2-7

Off

Set-up Mode

Disabled *

Enabled

2.8.16 MISCELLANEOUS JUMPERS

The following jumpers are installed in the factory as required. This explanation is provided in

case they are accidentally removed and must be replaced.

Security Option Jumpers on J5. Unless a Security Option Interface Cable is plugged into J5 on

the Main Board, jumper plugs must be installed at J5 pins 4&5 and pins 7&8.

Option Jumpers on J10. If the Option tray is not installed, a jumper must be placed at pins

13&14 of J10. This jumper allows normal operation of the unit when the Options Tray and the

Options Interface Board are not installed.

2.9 INTERCONNECT INFORMATION

Interconnect cables should be shielded for best performance. Figure 2.6, Interface Details,

gives simplified interconnect information about the unit.

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2.9.1 TELEPHONE CONNECTION

Connect the telephone line to the PHONE J1 RJ11C standard modular connector. The unit will

work with either an AC or DC telephone line. Telephone line polarity is not important. Note

that the phone connections are repeated at the terminal block on the rear panel for convenience.

Only one phone line may be connected; do not use J1 and the telephone connections on the

terminal block simultaneously.

Table 2-15

J1 - TEL LINE (RJ-11C)

Function

Not used

No Connection

Telephone Line Connection A

Telephone Line Connection B

No Connection

Not Used

2.9.2 RADIO CONNECTION

Connect the radio system to the RADIO J2 connector. The TX output and RX input are

designed to interface with 600 Ohm line connections at the radio, but the RTU-292 audio

interface is extremely flexible and can accommodate a wide variety of sources and loads. By

making different connections, the inputs and outputs may be configured for balanced or

unbalanced lines. The balanced configuration is the factory default and should be used if

possible, because it is the most noise-immune. To change to the receive audio to unbalanced,

single-ended input, connect the receive audio to RXA only and change jumper JP1 on the Main

Board to UNBAL. To change to the transmit audio to unbalanced, single-ended output,

connect the transmit audio to TXA only and change jumper JP3 on the Main Board to UNBAL.

Figures 2-5 and 2-6 details the various audio interface options. P1 pin 4, the External Signal

input, is used as the Squelch Break input. Key Out A and Key Out B are normally floating, but

pull to ground whenever the RTU-292 wants to key the associated transmitter. The Remote

Key Input may be pulled low to force the RTU-292 to key the associated transmitter.

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Table 2-16

P1-RADIO (DB-9 Male)

Function

Balanced Receive Audio Input B

Chassis Ground

Transmit Audio Output A

External Signal Input

/Key Output A (Relay Closure to Ground)

Receive Audio Input A

Transmit Audio Output B

/Remote Key Input

/Key Output B (Relay Closure to Ground)

2.9.3 HANDSET CONNECTOR

The handset supplied with the RTU-292 is plugged into front panel jack J7.

Table 2-17

J7 - HANDSET (RJ12C Jack)

Function

+5V Source

Ground

Earpiece Audio

Mic In

PTT Switch

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2.9.4 TERMINAL BLOCK

The terminal block on the rear panel is supplied for convenience when interfacing the RTU-292

to a communications system. The terminal block connections are in parallel with the I/O

terminals of the same name found on different connectors. If the telephone line connections at

Pin 1 and 2 of the terminal block are used to connect to PSTN line, then the TEL LINE

connector, J1, should not be used.

Table 2-18

Terminal Block (6 Position)

Pin Function

Telephone Line Ring

Telephone Line Tip

/Key Out

/Key In

Ground

Spare (See Note Below)

NOTE

In the RTU-282, Pin 6 of the terminal block was the /Squelch In input (also called

“External Signal In” for use with the Squelch Break feature. In the RTU-292, this

input has been moved to a more appropriate location, pin 4 of the P1 Radio

Connector. When retrofitting an RTU-292 into an existing RTU-282 installation,

it’s possible to maintain the existing interface wiring, with the /Squelch line

connected to pin 6 of the Terminal Block. For this to work, an internal jumper

must be added from E1 to E11 on the main PCB. E1 is located just below J12, the

connector that interfaces the terminal block to the main PCB. E11 is at the back of

the PCB, beneath the terminal block connections.

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2.9.5 RS-232 CONNECTION

Use P2 on the rear panel to connect to the RTU-292 RS-232 interface. RS-232 control is fully

explained in section 5.

Table 2-19

P2 – RS-232 Connector (DB-9 Male)

Function

No Connection

RS-232 RX Input

RS-232 TX Output

Reserved- Do not connect

Ground

Reserved- Do not connect

No Connection

2.10 AUDIO LEVEL SETUP AND ADJUSTMENTS

For proper operation of the RTU-292, the radio transmit and receive levels must be properly

set. The radio receiver level into the RTU-292 is of particular importance, because excessive

level here can cause telephone line overloading, distortion, VOX falsing and poor hybrid

operation. It is also important that the output level to the transmitter be set so that excessive

compression does not occur in transmitters with a compressor.

2.10.1 SETTING THE TRANSMIT LEVEL

There are two ways (detailed below) to set the transmit level: First apply TX audio by one of

two methods: (A) Use a 1 kHz test tone supplied by the RTU-292 when in the Transmit Level

Set-Up Mode, or (B) simply speak into the telephone line to supply typical audio to the RTU-

292. Next, rotate the internal TX Level Adjust R133 so that the transmitter is just fully

modulated. Either method will set the correct transmit level in the majority of cases. The radio

may also have a TX audio level setting procedure in its installation manual. If so, use the

radio’s procedure in conjunction with the directions below.

2.10.1.1

(A) Set-Up Mode. Enter the Set-Up Mode by turning off the unit, setting dipswitch SW2-7 to

ON. Turn unit power back on. In this mode, the RTU-292 DSP module generates a test tone at

the same amplitude as voice peaks received on a telephone line, and applies this tone to the

RTU-292 transmitter output. While in the Set-Up Mode, key the transmitter by pushing the

KEY pushbutton or by other means. If using (B) Telephone Line Method; simply press the

TEL-LINE-RADIO button and speak into the phone.

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2.10.1.2

Adjust TX Level Adjust so that the transmitter is just fully modulated. If the transmitter is AM

or SSB, use its output power meter (if available) to determine the amount of modulation. Do

this by advancing R133 clockwise just until the power meter stops rising. This will produce

maximum modulation without activating the radio’s compressor. When using an FM

transmitter, a deviation meter may be necessary to determine the amount of modulation.

NOTE

The RF Power meters on most SSB transmitters do not respond accurately to voice

peaks, so a low RF meter indication on actual voice from the RTU-292 may make

the transmitter appear to be under modulated. If the TX Level Adjust is increased

in an attempt to compensate for a low meter indication, level compression will

likely result, which will degrade system performance. If there is any doubt about

the amount of modulation being obtained, monitor the RF output with an

oscilloscope to observe the true conditions.

NOTE

Avoid excessive level into the transmitter. While most modern transmitters have

modulation limiters which will not allow them to over-modulate, excessive level

into the transmitter will cause level compression of the signal which effectively

degrades the hybrid null provided by the RTU-292. This is particularly important

with a full duplex system, which may oscillate if too much level compression is

used. For best results, adjust the TX Level Adjust so that the transmitter is just

fully modulated by the test tone or actual phone line audio.

NOTE

If the Transmit Level Set-up Mode was used, be sure to take the unit out of this

mode after set-up is complete by turning off the main power, switching SW2-7

back to OFF, and turning the power back on.

2.10.2 SETTING THE RECEIVE LEVEL

The audio level into the RTU-292 from the radio receiver is set by the internal RX Level

adjustment potentiometer, R116. The PEAK LED responds to the receiver audio coming from

the radio and is provided as a guide to setting this level (there are two peak LEDs, CR24 on the

Main Board as well as the front panel PEAK LED). The TEL LINE/RADIO button must be

ON for the PEAK LED to function. The level is correctly set when the PEAK LED flashes

occasionally (once per second to once every few seconds) in response to voice peaks in the

incoming audio. If the indicator flashes continuously, the level is too high and must be

reduced.

To set the level, tune the receiver to a station with a strong signal that will provide maximum

audio into the RTU-292. Turn the RX Level Adjust control clockwise (to increase the level) or

counterclockwise (to decrease the level) as necessary until the PEAK indicator flashes

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occasionally on voice peaks. Note that the PEAK indicator responds only to incoming radio

audio, not telephone audio.

The range of the RX Level Adjust control is about -40 dBm to +10 dBm. If the level from the

radio is outside this range, the correct level cannot be set using the RX Level Adjust control

alone, and it will be necessary to adjust the audio output at the radio itself until the correct level

is obtained.

NOTE

The proper operation and excellent performance of the RTU-292 will not be

obtained if the audio level from the receiver into the RTU-292 is not set correctly.

Excessive audio will overload the telephone line and equipment, causing distortion,

VOX falsing and poor hybrid operation. In addition, the telephone company may

cut off a call in progress, which contains audio high enough to bleed over into other

circuits.

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Figure 2-1

Outline Dimensions

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Figure 2-2

Control and Connector Locations

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Figure 2-3

Location Of Internal Option Settings

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Figure 2-4

Internal Option Setting Details

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Figure 2-5

Audio Interface Wiring Diagram

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Figure 2-6

Interface Details

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2.11 INSTALLATION CHECKLIST

Table 2-20

Installation Checklist

Provide suitable Mounting and Cooling.

Check AC Line voltage selection.

DC Operation needed?

See Section 2.5.

See Section 2.7.

Make Interconnections.

See Section 2.9 for External Interconnect Information.

Serial Remote Control needed?

Set Serial Remote Baud Rate with SW1-1 and 2. See RS-

232 protocol in Section 5.

Set TX/RX Audio Levels if necessary.

See Table 2-1 and Section 2.10.

See Table 2-1 and Section 2.8.

Set Telephone Line Levels if necessary.

Are other Factory Default Settings correct for See Table 2-1 and Table 3-2.

this system? Make necessary changes as explained in sections 2.8, 2.10,

and 3.7

2.12 OPTIONS INSTALLATION AND CONFIGURATION

See section 7 for installation instructions for all field-installable options. Section 7 also

explains how to set-up any options that have configuration switches, jumpers, potentiometers,

etc. For any options not covered in section 7, refer to custom notes supplied with the RTU-292

or the option, or contact JPS for information.

End of Section 2

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3 Operation

3.1 GENERAL

This section contains information and instructions required for proper operation of the RTU-

292.

3.2 FRONT PANEL CONTROLS, INDICATORS AND CONNECTORS

3.2.1 MAIN POWER SWITCH

The Main Power switch controls the external DC power to the unit. The switch is a locking

toggle type to prevent inadvertent operation.

3.2.2 HEADPHONE JACK

This front panel jack accepts a standard 1/4 inch diameter monaural phone plug. The output

will drive low, medium, or high impedance headphones. The phones audio level is adjustable

via the PHONES VOLUME control on the right side of the panel.

3.2.3 HANDSET JACK

This front panel jack is a standard 6-pin RJ12C jack that connects the handset to the unit.

3.2.4 HANDSET

The handset allows sending and monitoring audio to and from either the telephone line, the

radio, or both, depending on the HANDSET/PHONE and HANDSET/RADIO pushbutton

selections. The handset also has a PTT (Push-To-Talk) switch to key an associated radio. The

handset PTT switch is active only when any of the following functions are selected (associated

LEDs on): TEL LINE/RADIO, HANDSET/RADIO, or SPEAKER/RADIO. The PTT switch

need not be depressed when communicating with a second party via a PSTN line. The handset

earpiece audio level is controlled by the HANDSET volume control. A convenient hanger for

the handset may be attached to the left side of the front panel (mounting screws are installed in

the front panel, remove the nuts from these screws, throw the nuts away, and use the screws to

attach the hanger). This hanger, supplied in the RTU-292's accessory kit, may also be installed

elsewhere on the equipment rack.

3.2.5 SPEAKER

The speaker allows monitoring of telephone line and/or radio audio, depending on the

selections of the SPEAKER/PHONE and SPEAKER/RADIO monitor modes. In addition, the

speaker serves as the telephone ringer for incoming calls. The speaker volume (except for the

ring signal) is controlled by the SPEAKER volume control located on the right side of the front

panel. The ring signal may be enabled or disabled by the AUDIBLE RING pushbutton. The

ring volume is controlled by an internal potentiometer R156 (see section 2.8).

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3.2.6 KEYPAD

The 12-key keypad is used for telephone dialing. It is active only when the TEL LINE/PHONE

path is selected. Dialing may be either via DTMF mode or pulse mode as determined by

internal dipswitch selection.

3.2.7 SPEAKER VOLUME CONTROL

This potentiometer controls the volume of audio (except telephone ringer volume) at the front

panel speaker. Rotate clockwise to raise audio from minimum to full. Telephone ringer

volume is controlled independently by an internal adjustment, R156 (see section 2.8).

3.2.8 PHONES VOLUME CONTROL

This potentiometer controls the signal level present at the front panel headphone jack and in the

handset earpiece. Rotate clockwise to increase the audio level.

3.2.9 TEL LINE BUTTONS

These three buttons, PHONE, RADIO and OFF, determine whether the internal telephone, the

radio, both, or neither (OFF) are connected to the telephone line.

Pushing the TEL LINE/PHONE button connects the RTU-292 internal telephone to the

telephone line and allows dialing using the keypad. Pushing this button will also answer an

incoming telephone call. The associated LED will be illuminated while the telephone line to

internal phone path is selected.

Pushing the TEL LINE/RADIO button connects the telephone line to the radio through the DSP

adaptive hybrid. The unit then starts its adaptation cycle by putting a burst of white noise onto

the telephone line. When the adaptation cycle is underway, the TEL LINE/RADIO LED will

flash. After successful completion of the adaptation cycle, this LED will be on continuously,

indicating that the unit is ready for operation.

The TEL LINE/OFF pushbutton will hang up any active TEL LINE/RADIO or TEL

LINE/PHONE connection.

3.2.10 HANDSET BUTTONS

These two buttons, PHONE and RADIO, allow the handset to be connected to the internal

telephone, the radio, or both simultaneously. Each button has an associated LED that is

illuminated when the path is active.

Pushing the HANDSET/PHONE button connects the handset to the telephone audio path ad

activates the handset microphone. Note that this will not take the telephone off-hook; the TEL

LINE/PHONE LED must also be on for the handset to be used to communicate over the

telephone line.

Pushing the HANDSET/RADIO button selects the handset to the radio audio path. When this

path is selected (HANDSET/RADIO LED is on) the handset PTT switch will key the radio

transmitter.

If both paths are simultaneously selected, the audio heard in the earpiece will be the radio

receive and telephone audio mixed together, and microphone input will be sent both to the

telephone line and to the radio transmitter.

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3.2.11 SPEAKER BUTTONS

These two buttons, SPEAKER/PHONE and SPEAKER/RADIO, determine whether the

speaker monitors telephone receive audio, radio receive audio, or both. Note that if a radio-to-

telephone call is underway and both buttons are pressed, the full conversation is being

monitored. There is an LED alongside each button that is illuminated when the associated path

is selected.

3.2.12 TEL VOX

This button enables keying of the radio transmitter by the RTU-292 VOX (Voice Operated

Xmit) facility. When the VOX is selected (associated LED ON), the VOX is active, and the

key relay is energized when the VOX circuitry detects a signal from the telephone line. The

VOX PTT output has a “hang” time to keep it from dropping out during short pauses in speech.

The hang time duration is the length of time that the PTT signal will remain active following

the loss of detection of signal. (The hang time is internally adjustable; see section 2.8). If the

TEL LINE/RADIO LED continues to flash for more than ten seconds after the TEL

LINE/RADIO pushbutton has been pressed to make a connection, the unit has not adapted

properly and VOX operation will not be possible.

3.2.13 AUTO ANS BUTTON

This pushbutton may be used to manually enable (LED ON), or disable (LED OFF), the Auto

Answer feature. When enabled, the RTU-292 is in the Automated Operation Mode and the

unit will automatically answer the phone after 2 rings. See section 3.7 for a description of the

Automatic Operation capabilities of the RTU-292.

3.2.14 AUDIBLE RING BUTTON

This button determines if the ring from an incoming telephone call will be heard via the RTU-

292’s speaker. When the Audible Ring mode is enabled, the ring signal will be audible in the

speaker. The ring volume is independent of the SPEAKER VOLUME setting, and is set

internally by adjustment R156. Regardless of the position of the AUDIBLE RING button, the

LED indicator associated with the TEL LINE/PHONE button flashes on an incoming ring, so

that a visual indication of the ring signal (incoming call) is always provided.

3.2.15 KEY PUSHBUTTON

This pushbutton operates the key function of the RTU-292, sending a key command to the

associated transmitter. This button is functional at all times. The red KEYED LED next to the

KEY pushbutton is lit whenever a key command is sent to the transmitter from any source

within the RTU-292 (handset keyswitch, or TEL VOX, for example), not just from the KEY

pushbutton.

3.2.16 PEAK LED

This red LED flashes on audio peaks that are detected in the audio incoming from the receiver

to indicate the proper adjustment of the internal RX LEVEL control (R116). The input level is

correct when the PEAK LED flashes occasionally on incoming receiver speech peaks. If the

LED flashes continuously, the input level is too high and should be reduced (see paragraph

2.10). Note that this LED does not respond to telephone audio.

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3.3 REAR PANEL CONNECTORS

Accessible at the RTU-292 rear panel are the radio connector, telephone line and local phone

connector, the signal terminal block, the DC power terminal block, an RS-232 connector, and

the AC power connector/voltage selector/fuse holder assembly. See section 2.9 for full pin-out

information.

3.3.1 P1 RADIO CONNECTOR

This male DB9 connector is the interface between a radio system and the RTU-292. It contains

transmit audio, receive audio, and keylines.

3.3.2 J1 TEL LINE

The RJ11C jack provides the telephone line connection to the RTU-292. The telephone line

connections are also available at the terminal block.

3.3.3 TERMINAL BLOCK

The terminal block is provided mainly as a convenience for the connection of the telephone line

to the unit if an RJ-11C plug is not available. This block also contains the key relay contacts to

the transmitter, remote key input signal, ground, and a spare External Signal Input.

3.3.4 J2 LOCAL PHONE CONNECTOR

This RJ-11C jack is used to connect a local phone to the unit. The Local Phone Option must be

installed for this port to be active.

3.3.5 P2 RS-232 CONNECTOR

This female DB-9 connector provides an interface between the RTU-292 and a radio or a

controlling terminal via standard RS-232 signal lines.

3.3.6 DC INPUT TERMINAL BLOCK

This two-position terminal strip has a pair of screw terminals, one for a ground wire and

another for the DC input of either +12 or +24/+28VDC (nominal). Internal slide switch S6 is

used to select between +12 and +24/+28 volt input. Refer to section 2.7.

3.3.7 P1 AC POWER CONNECTOR

This is a combination AC power connector, fuse holder and line voltage selector. It

incorporates a line filter to reduce the possibility of RF pickup by the power line from close-

proximity transmitters. Section 2.7 has complete instructions for the line voltage selection and

fuse replacement.

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3.4 OPERATION

3.4.1 OPERATION OVERVIEW

The RTU-292 is a flexible piece of equipment that contains a telephone and a radio/telephone

interface circuit with a unique adaptive hybrid. These circuits are arranged so that they can be

used together or independently in several different ways. The unit may be used to manually

create the telephone to radio connection, or an unmanned connection can be made in the

automated mode. Here are some examples of RTU-292 operating modes:

1. The telephone may be used to place and receive calls independently of the radio interface.

2. The speaker may be used to monitor radio traffic while the handset is used with the internal

telephone to place a telephone call.

3. The handset may be used to transmit/receive from the radio.

4. The radio may be connected to the phone line through the adaptive hybrid.

5. A phone call may be patched through to a radio link, or a radio link patched into a phone

line. This can be accomplished unattended using a pair of RTU-292s in the Automated

Mode.

The following paragraphs describe the RTU-292 operating modes in detail.

3.4.2 USE OF THE RTU-292 SPEAKER TO MONITOR AUDIO

1. To monitor radio receive audio, push the SPEAKER/RADIO button. The associated LED

will light.

2. To monitor telephone audio, push the SPEAKER/PHONE button. The associated LED will

light. Either the TEL LINE/PHONE or the TEL LINE/RADIO LED must be ON,

indicating that the telephone is off-hook, or there will be no audio present.

3. Note that radio receive audio and telephone audio may be simultaneously monitored.

3.4.3 PLACING A TELEPHONE CALL

1. Ensure that telephone audio will be available at the handset (HANDSET/PHONE LED is

ON).

2. Connect the RTU-292 to the outside phone line by pressing the TEL LINE/PHONE button;

listen for the dial tone.

3. When dial tone is heard, dial the desired number using the keypad. The handset will

function like an ordinary telephone handset.

4. If desired, the phone conversation may also be monitored via the front panel speaker by

depressing the SPEAKER/PHONE switch (SPEAKER/PHONE LED ON). Prevent

feedback by controlling speaker volume and keeping the handset a sufficient distance from

the speaker.

5. To hang up, press the TEL LINE/PHONE button, or the TEL-LINE OFF button, so that the

TEL LINE/PHONE LED goes out.

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3.4.4 RECEIVING A TELEPHONE CALL

NOTE

The handset-to-telephone path may be left in the enabled condition

(HANDSET/PHONE LED ON) even when the unit is not connected to the

telephone line. Only one button (TEL LINE/PHONE) must then be pushed to

answer the telephone.

The following scenario assumes that the

HANDSET/PHONE LED is already ON.

1. When the ring is heard (or the flashing TEL LINE/PHONE LED is observed) indicating an

incoming call, push the TEL LINE/PHONE button and speak into the handset. It isn't

necessary to press the handset PTT switch to use the telephone.

2. To hang up, press the TEL LINE/PHONE button again. The adjacent LED will turn off.

3.4.5 PUTTING A TELEPHONE CALL ON HOLD

Once a telephone call has been received or initiated and the TEL LINE/PHONE LED is

illuminated, pressing the HANDSET/PHONE button or the SPEAKER/PHONE button will put

the call on “hold”. (The call will not be cut off as long as the TEL LINE/PHONE button is not

pressed.)

For example, if the RTU-292 operator has made a telephone connection and wishes to contact a

radio party to continue setting up the patch, he may place the telephone call on “hold” and

speak with the radio party using the handset as described in 3.4.6.

3.4.6 USING THE HANDSET WITH THE RADIO

Pressing the HANDSET/RADIO button will connect the handset to the radio's audio lines

(associated LED will be on). The receive audio will be heard in the earpiece, and when the

radio is keyed (via the handset or front panel key switches) the handset mic audio will be

routed to the transmitter. The SPEAKER/RADIO pushbutton may also be used to monitor

radio receive audio via the RTU-292's front panel speaker.

3.4.7 CONNECTING THE RADIO TO THE TELEPHONE LINE

To patch the radio to the telephone line, push the TEL LINE/RADIO button to ON. This will

cause the adaptive hybrid to operate in the following manner:

3.4.7.1 Initial Adaptation

The two-wire to four-wire hybrid in the RTU-292 adapts to the phone line each time the TEL

LINE/RADIO button is engaged. To adapt, it measures the characteristics of the line by

placing a white noise source (built into the unit), on the line for a short time. While the noise

burst is connected, the amount of signal “reflected” from the phone line is measured and

adaptation begins. The adaptation algorithm adjusts the adaptive hybrid to minimize the

reflected signal, throughout the audio frequency spectrum, from the phone line. During the

adaptation process, the TEL LINE/RADIO LED will flash. When adaptation is complete, the

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noise source is switched off, the LED is lit continuously, and the unit is ready for operation.

This adaptation procedure normally takes less than one second.

For adaptation to be successful, the far end of the phone line must be quiet (there must be no

signal coming into the RTU-292 from the phone line during adaptation). If there is incoming

audio, the unit may not be able to adapt, but will keep trying for up to ten seconds. For

example, the telephone user at the far end of the phone line should not talk during the

adaptation cycle. If the TEL LINE/RADIO LED does not stop flashing within the normal

second or two after the TEL LINE/RADIO button is pushed, wait a short time longer. If the

LED still continues to flash, chances are that there is excessive noise on the phone line, and it is

best to hang up and redial.

Because the adaptation algorithm is very robust, connection to an unquiet phone line is about

the only case where the RTU-292 will fail to adapt, as the hybrid has the ability to adapt to line

conditions from a short-circuit to an open-circuit, as well as the impedance presented by the

extremely complex distributed network of a telephone line.

3.4.7.2 CONTINUOUS ADAPTATION

Once the initial adaptation is complete and the unit begins operating, hybrid adaptation

proceeds continuously using receiver audio sent down the telephone line (the noise burst is not

needed again). This feature enables the RTU-292 to automatically adapt its hybrid balance to

changing line conditions.

3.4.8 MANUAL PHONE PATCH PROCEDURE

A telephone patch establishes a communications link between a distant radio, a local radio

(interfaced directly to the RTU-292 via the P1 Radio connector) and a distant telephone that is

connected to the unit via the telephone line. This distant telephone will be patched through the

local radio set to the distant radio set allowing communication directly between the distant

radio set and the distant telephone.

Begin with the RTU-292 installed and its power on:

3.4.8.1

The operator first establishes a link between the local radio set and the distant radio set using

the RTU-292’s handset with the radio, as described in paragraph 3.4.6. Alternatively, the

operator may have received a radio call from a distant radio party wishing to make a phone

patch.

Using the RTU-292’s internal telephone set, the operator now places a call to the distant

telephone.

3.4.8.2

The operator begins the procedure by using the RTU-292’s internal telephone set to place a call

to the distant telephone party. Alternatively, The operator may have received a call from a

distant telephone party wishing to make a phone patch. He then places the telephone party on

hold while the distant radio party is contacted.

The operator then establishes a link between the local radio set and the distant radio set using

the RTU-292’s handset with the radio, as described in paragraph 3.4.6.

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3.4.8.3

Once the telephone and radio party have both been contacted, the operator should advise the

telephone party that a phone patch is being set up. He may want to advise that a short noise

burst (not extremely loud) will be heard in the telephone receiver, and that the conversation can

proceed following the burst. The operator then pushes the TEL LINE/RADIO button to begin

adaptation, indicated by a flashing TEL LINE/RADIO LED.

3.4.8.4

After the RTU-292 automatically adapts itself to the phone line, and the TEL LINE/RADIO

LED will stop flashing and stay continuously illuminated. This indicates that a complete link

has been established between the distant radio set and the distant telephone, via the RTU-292

and the local radio set.

3.4.8.5

Progress of the call may be monitored via the speaker on the RTU-292 front using the

SPEAKER/PHONE and SPEAKER/RADIO buttons.

3.4.8.6

The call may also be monitored with the handset. The operator may speak and listen to either

the telephone party alone, the radio party alone, or both together, using the HANDSET

pushbuttons.

3.4.8.7

When the conversation is complete, the operator pushes the TEL LINE OFF button to

disconnect from the phone line. The TEL LINE/RADIO and TEL LINE/PHONE LEDs will

both turn off, indicating that the phone is back on-hook (disconnected).

3.4.9 TRANSMITTER KEYING, HALF DUPLEX SYSTEM

For a normal half-duplex radio link, it is usual for the VOX in the RTU-292 to key the

transmitter. The VOX responds to signals from the telephone line and operates the keying

circuits when voice is present. Once the VOX has tripped, it remains active for the selected

“hang time” following the loss of audio to prevent dropout on pauses between syllables. The

unit also incorporates a short delay of the transmitted audio, which allows the VOX to key the

transmitter a short time before the audio arrives, so that the RF output can be at full power to

avoid missing part of the first syllable.

The VOX in the RTU-292 is generated within the DSP and is extremely sensitive and reliable.

However, there are occasions when the audio level from the telephone line is too low to operate

the VOX reliably, or for some other reason it is desired to key the transmitter manually. To do

this, operate the front panel KEY pushbutton or the handset PTT button to key the transmitter.

The VOX switch can be left engaged, if desired, so that the operator can override the VOX at

any time, or the VOX may be disengaged, so all keying occurs manually.

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3.4.10 TRANSMITTER KEYING, FULL DUPLEX SYSTEM

In a full duplex system, the transmitter can be held continuously keyed during a conversation,

because the system can receive and transmit at the same time. Thus, VOX is not required. In

this case, the transmitter may be keyed from the RTU-292 by pulling either of its external KEY

inputs low. The Full/Half Duplex dipswitch setting has no effect on transmitter keying.

3.5 REMOTE KEY

The RTU-292 contains a remote /Key signal that can be activated at any time. The unit will

key the transmitter any time this input is pulled low while the power is on.

3.6 SELF TEST

The RTU-292 self-test routine operates each time the unit is powered up. This routine tests the

non-volatile RAM for out-of-range parameters and various functions of the DSP module. The

unit also performs a "Walking LED" test, turning each of the front panel LEDs on in

succession, providing an indication of correct I/O operation. A successful self-test will be

indicated by the "Positive Acknowledge" tone prompt and, if the Voice Prompt Option is

enabled, the “RTU-292 Automatic Phone Patch” greeting prompt. Failure of the self test (or

failure of the DSP module at any time) is indicated by a long "Negative Acknowledge) tone and

a constantly blinking PEAK LED. The radio connect functions of the unit will not operate,

although the telephone may continue to operate.

3.7 AUTOMATED OPERATION

The RTU-292 can patch the telephone line to a radio system completely unattended when in the

Automated Operation Mode. To enter this mode, simply press the AUTO ANSWER

pushbutton. The unit will signal its present status and request remote operator responses

through the use of Tone Prompts and (if equipped) with actual voice messages called voice

prompts.

3.7.1 TONE PROMPTS

The RTU-292's tone prompt sequences and their meanings are:

3.7.1.1 Positive Acknowledge (ACK)

When the RTU-292 wants to signal an acknowledge it will play 1 short high-pitched tone

followed by 1 short low-pitched tone. The RTU-292 usually plays an ACK in response to a

user-initiated command. ACK means that the command was received and was legitimate

3.7.1.2 Negative Acknowledge (ERROR)

When the RTU-292 wants to signal a negative acknowledge or error it will play 1 long low-

pitched tone. An ERROR is usually played as a response to incorrect user entry, or following

the receipt of an illegitimate command that could not be executed.

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3.7.1.3 Waiting For Input (QUERY)

When the RTU-292 needs user input it will play 1 short low-pitched tone followed by 1 short

high pitched tone. A QUERY is played whenever the user needs to enter some data such as a

password or telephone number.

3.7.1.4 Radio Is Keyed (KEYED)

When the RTU-292 wants to signal that the user has keyed the radio it will play 1 short high-

pitched tone. The RTU-292 will play KEYED whenever the user has manually keyed the radio

by entering the correct telephone command.

3.7.1.5 Radio Is Unkeyed (UNKEYED)

When the RTU-292 wants to signal that the user has unkeyed the radio it will play 1 short low-

pitched tone. The RTU-292 will play UNKEYED whenever the user has manually unkeyed the

radio by entering the UNKEY telephone command.

3.7.1.6 Disconnecting (DISCONNECT)

When the RTU-292 wants to signal that it is dropping the radio communications link (and

hanging up the phone) it will play 3 short high-pitched tones. The RTU-292 may disconnect

for a number of reasons:

1. Any time the user enters a * (star) followed by a # (pound sign).

2. Whenever Busy Tones or Reorder tones are heard on the phone line. The DSP algorithms

are always searching for call progress activity on the phone line.

3. The unit will also disconnect if there is a lack of any activity on the phone line for a time

longer that that set by the Inactivity Timer (see Table 3-1). If the unit signals that it is

dropping the link due to a lack of activity, either party may prevent the disconnection by

speaking within five seconds.

4. Whenever “Line Reversal” (Reverse Battery Signaling) is detected on the phone line.

3.7.2 VOICE PROMPTS

If the RTU-292 is equipped with the Voice Prompt Option it will prompt the user for input and

signal its current status to the user status by playing pre-recorded messages, called voice

prompts. Tone prompts are played before each voice prompt. For example, if the RTU-292

wanted the user to enter the password it would play the QUERY tone sequence followed by the

voice prompt “Enter Password”. The number of different tone prompts is limited because the

average user cannot be expected to remember more than a few. However, since voice prompts

are largely self-explanatory the RTU-292 has more than 30 different voice prompts. The

remainder of this section includes a description of the voice prompts that the unit provides at

appropriate times during unit operation. These prompts are only heard if the Voice Prompt

Option is installed.

3.7.3 CALLING THE RTU-292 VIA THE OUTSIDE LINE

If the RTU-292 is set for Automatic Answer (AUTO ANSWER LED lit) it will answer an

outside call after 2 rings. Once the unit answers the phone, the caller controls the unit by

sending commands via the keypad of a DTMF telephone. Rotary-style telephones cannot be

used to control the RTU-292.

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The following paragraphs describe the sequence of operations used to automatically place a call

through the RTU-292 to a radio via the outside phone line. This description assumes that the

RTU-292 has a Voice Prompt Option installed. Units without a Voice Prompt Option will

function identically except for a lack of voice prompt messages. The tone prompts listed in

3.7.1 are provided by the RTU-292 whether or not the Voice Prompt Option is installed.

3.7.3.1 The Caller Dials The RTU-292

When a call is made over the telephone line by a distant telephone to the RTU-292, the unit

answers the phone and plays the greeting voice prompt: “RTU-292 Automatic Phone Patch”.

If password protection is enabled the unit plays the QUERY tones followed by the “Enter

Password” voice prompt. If password protection is not enabled the unit will move directly to

the adaptation process (3.7.3.3).

3.7.3.2 The Caller Enters The Password (if enabled)

The password is a sequence of numbers (0-9). The password may range from 1 digit up to 10

digits. When the RTU-292 is shipped from the factory it is given the default password “1 2 3

4”. The password may contain only numbers (no * or # characters). If the user enters an

incorrect password the RTU-292 will give him two additional tries. If the unit has the Voice

Prompt Option installed, voice prompts will guide the user in trying again to enter the correct

prompt. Otherwise, the “Query” prompt will be given. If the correct password is still not

entered after three tries, the unit will then play the DISCONNECT tones and immediately hang

up. When the unit receives the correct password, it moves on to the adaptation process. See

3.7.3.4 for instructions related to changing the existing password.

3.7.3.3 The RTU-292 Adapts To The Phone Line

The RTU-292 hardware has an Adaptive Hybrid that is controlled by a Digital Signal Processor

(DSP). The hybrid matches the RTU-292 to the telephone line and also allows the radio to be

keyed automatically by detecting the presence of the caller's voice on the telephone input. This

“Voice Operated Transmit” method of keying is called VOX. Note that the VOX will be

activated for any type of signal on the input, whether it is speech or any other energy above the

VOX sensitivity level.

Before the DSP can accurately detect the caller's voice the RTU-292 must first "adapt" to

current phone line conditions. During the adaptation process the DSP will momentarily emit

white noise on the phone line. This noise burst sounds like a loud hiss. It is important for

successful adaptation that the caller does not talk or enter any DTMF commands during the

adaptation process. It helps to keep the phone line as quiet as possible. The adaptation process

will normally take less than two seconds to complete, but under noisy line conditions the

process may take as long as 10 seconds. During the adaptation process, the DSP measures the

white noise that is reflected back from the phone line and matches the RTU-292 to minimize

the reflected signal. This process is completely automatic and requires no user adjustments.

After the DSP has adapted, the RTU-292 will play the ACK (acknowledge) tones and give the

“Ready” voice prompt (if the Voice Prompt Option is installed). If the DSP cannot adapt, the

unit will play the ERROR tone and give a “VOX Unavailable” voice prompt. If VOX is

unavailable the caller must give a “KEY” command before speaking, and then give an

“UNKEY” command turn off the transmitter and listen to the reply (see 3.7.3.4).

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3.7.3.4 The RTU-292 Enters the COMMAND Mode

After the RTU-292 completes the adaptation sequence, it enters the Command Mode and waits

for the caller to respond with commands. In Command Mode the user may enter DTMF

commands by pressing a number on the telephone’s keypad. The unit stays in Command Mode

until the caller gives the * # sequence to hang up. If the caller gives an incorrect command the

unit plays the ERROR tone and gives the “Invalid Entry” voice prompt.

When the RTU-292 is used in the command mode, it is connected to a radio system that is

ready to respond to the basic RTU-292 commands. At a minimum, the radio must be turned on

and set to the appropriate frequencies, and the radio audio and PTT input lines must be

connected to the RTU-292. One of the dipswitches allows the RTU-292 to be put into the

Radio Control Mode via a DTMF command. This mode enables the RTU-292 to control a

companion Motorola URC-200 radio via its RS-232 serial port. See Tables 2-9, 3-1 and 3-3.

NOTE

It is important to note that only the distant phone connected to the telephone line is

routed through the DSP and therefore it is the only phone that can use the RTU-

292's VOX function. The local phone and the unit's handset and keypad do not

have VOX capability. Operators using the local phone or the handset to

communicate via the radio must always disable the VOX function and manually

key and unkey the transmitter.

3.7.4 PLACING A CALL IN THE COMMAND MODE:

When a phone call is initiated by the RTU-292 to a distant phone on the outside line, and the

called party picks up the phone, the unit's DSP will immediately execute the adaptation process.

When it is successful, the RTU-292 responds with the “READY” voice prompt. If the DSP

could not adapt, the RTU-292 gives the “VOX UNAVAILABLE" prompt, informing the recipient

of the call that he must manually key and unkey the transmitter. All other operation procedures

are the same as when a call is initiated by the distant telephone to the RTU-292.

3.7.5 TERMINATING A CALL:

There are several different ways to terminate a call.

1. If the PSTN that the RTU-292 is connected to has “Reverse Battery Signaling” (sometimes

called “line reversal”), the call will be terminated whenever the telephone caller hangs up

the phone. Reverse Battery Signaling is used by most domestic US phone systems, but is

not widely used outside of the US. Reverse Battery Signaling momentarily inverts the tip

and ring lines to signal that a caller has gone back on-hook (hung-up).

2. The sequence * # will cause the system to disconnect. This sequence may be given at ANY

time, even when the system is prompting for input. If Reverse Battery Signaling is not

present, the * # termination sequence is always required at the distant phone, as the RTU-

292 will not be aware that the call has been terminated unless the unit receives Busy or

Reorder call progress tones. Otherwise the link will not be disconnected until the inactivity

timer expires (see table 3-1 for information about setting the inactivity timer duration). If

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the unit signals that it is dropping the link due to a lack of activity, either party may prevent

the disconnection by speaking within five seconds.

3. Pressing the OFF button on the front panel of the RTU-292 will also cause the system to

disconnect.

4. When the local phone is used, its operator may use the * # sequence or may simply hang up

the phone.

3.7.6 DTMF CONTROL COMMANDS

Tables 3-1, 3-2, and 3-3 explain and list the RTU-292’s various DTMF command modes.

DTMF commands may be entered via a connected telephone, a telephone set when the Local

Phone Option is installed, or via the front panel keypad*. Additionally, the DTMF keypad on a

radio may be used to make connections (see DTMF Access Option, 3.7.11).

* Some restrictions apply when sending commands via the front panel keypad:

3.7.6.1 OPERATING THE RTU-292 FROM THE FRONT PANEL KEYPAD

The RTU-292 can be operated from its front panel to allow the unit to be programmed, and if

so equipped, control a Motorola URC-200 radio. When using the front panel, the operator uses

the handset and keypad.

To begin front panel operation the user must enter three "*" keypresses. The RTU-292 will

respond with an Acknowledge tone prompt and the voice prompt "READY". At this point all

front panel keypad entries are treated just as though the user were sending commands via the

telephone or local phone.

Front panel control operation will continue until one of the following conditions occurs:

• The user enters a "*#" sequence.

• There is no PTT activity or keypad activity for the duration of the activity timer.

While the operator is using the keypad to control the RTU-292, the unit will not be available

for:

• PSTN Auto Answering.

• Radio Squelch Break Access (S/W option).

• Radio DTMF Control (S/W option).

• Local Phone Control (H/W option).

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Table 3-1

Standard DTMF Operational Commands

These commands may be entered by the RTU-292 front panel keypad, or by the keypad of a

connected telephone or by a telephone set wired to the Local Phone Option. See 3.7.6 for

special instructions regarding the use of the front panel keypad to send DTMF Commands.

DTMF Command Function

* #

* 0

Terminate the call.

Manual Keying Toggle.

Press once to key; the next press will unkey, etc.

To prevent simultaneous use of VOX and Manual Keying, if VOX was

enabled when * 0 is first entered, it will be shut off.

* 1

* 2

VOX Toggle.

If VOX is on, * 1 will turn it off. If VOX is off, * 1 will turn it on.

VMR Toggle.

If VMR is on, * 2 will turn it off. If VMR is off, * 2 will turn it on.

VMM-100 Option must be installed

Noise Reduction Toggle.

* 3

* 4

If Noise Reduction is on, * 3 will turn it off. If it’s off, * 3 will turn it

on. VMM-100 Option must be installed.

Security Mode Toggle.

If Security Mode is on, * 4 will turn it off. If it’s off, * 4 will turn it on.

Security Device Option must be installed (not currently available).

* 5

* 6

Page the Operator (make a call to the RTU-292 operator at the front

panel keypad / handset).

Page the Local Phone Operator (this command can obviously made

only by a connected telephone and not by the Local Phone).

* 7

* 8

Reserved for future use.

Radio Control Mode. (Requires optional radio control S/W.)

Use this command to enter the Radio Control Mode (dipswitch SW1-3

must also be ON to enable this mode). This mode enables DTMF

control of a companion Motorola URC-200 radio. See Section 7.

If the RTU-292 is in the Radio Control Mode, * # will return it to

standard RS-232 control mode. See Table 7-6.

* 99

Enter the programming mode.

If passwords are enabled, the user will be prompted for the system

password and not allowed to enter the programming mode unless the

password is correctly entered. See Table 3-2.

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Table 3-2

Programming Mode DTMF Commands

These commands may be entered by the RTU-292 front panel keypad*, or by the keypad of a

connected telephone or by a telephone set wired to the Local Phone Option. The unit must

be put into the programming mode by entering *99 before these commands can be executed.

*See 3.7.6 for special instructions regarding the use of the RTU-292 keypad.

DTMF Command Function

* 0 x

* 1 x x x #

* 2 x

Call Logging Enable/Disable. * 0 0 Disables Call Logging (factory

default is disabled). * 0 1 Enables Call Logging. See 3. 7.13.

Change the password to "xxx". Terminate entry with #.

Password may be up to 10 digits long. Factory default is 1 2 3 4.

Program the inactivity disconnect timer based on value of "x".

See 3.7.8 for more information.

* 2 0

* 2 1

* 2 2

* 2 3

* 2 4

* 2 5

* 2 6

* 2 7

* 2 8

* 2 9

Disabled (not recommended see 3.7.8)

2 Minutes

5 Minutes (factory default)

10 Minutes

20 Minutes

30 Minutes

45 Minutes

60 Minutes

90 Minutes

120 Minutes

* 3x

Program the Calling Timer based on the value of “x”.

The RTU-292 will attempt to place a call to a telephone until this timer

expires. See 3.7.8 for more complete information.

* 3 0

* 3 1

30 Seconds (factory default)

1 Minute

* 4xx

* 5

Program Speed Dial Entry “xx”. See 3.7.10.

Review Speed Dial Entry “xx”.

* 6 x

Select 2 wire or 4 wire operation based on the value of “x”. See 3.7.15

* 6 0

* 6 1

* 6 #

2 wire operation (factory default)

4 wire operation

Query to learn current setting

* 7 & * 8

* 9

Reserved for future use.

Reserved for JPS Manufacturing

Leave Programming Mode

* #

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3.7.7 RTU-292 PASSWORD PROTECTION

The password protection feature is enabled by a dipswitch setting (SW1-5, see Table 2-1).

When passwords are enabled, access to the system is denied unless a user enters the correct

password. The same password applies both to access via telephone and via a radio (if the

DTMF Radio Access feature is used). Users are given three tries to correctly enter the system

password before the RTU-292 terminates the call attempt and returns to its waiting state.

The system assists the user in entering the password by the use of Voice and Tone Prompts (if

the Voice Prompt Option is installed), or simply with Tone Prompts.

The factory default password is “1 2 3 4”, and this password can be changed to any DTMF or

numerical value up to 10 characters in length. To change the password, first enter the

programming mode by entering ‘* 9 9”. If passwords are currently enabled, it will be

necessary to enter the correct password to continue programming. From the programming

mode, enter “* 1 x x x #” where “x x x” is the new password, up to 10 characters long. Next

enter “* #” to leave the programming mode.

3.7.8 INACTIVITY DISCONNECT TIMER

The inactivity disconnect timer ensures that the system does not remain locked up on a

completed call if system users forget to or are unable to terminate a call by normal means. The

inactivity timer samples audio from both the radio and the telephone. If no activity is detected

for a time equal to the Inactivity Disconnect Timer setting, the RTU-292 will notify the users

by three short beeps that they have five seconds to respond or the call will be terminated. If

either the radio user or the PSTN caller initiates activity within 5 seconds of the warning beeps,

the timer is reset.

Inactivity Disconnect Timer lengths of 2 minutes to 120 minutes (or disabled) are available.

Enter “* 9 9” to enter the programming mode, then “* 2 x” to set the timer. The value of x sets

the timer length. See Table 3-2 for the list of timer durations. The value of x = 0 will disable

the timer so that the connection may be maintained indefinitely. Unless a permanent

connection is required, disabling the timer is not recommended. If the telephone caller does not

correctly terminate the call, the unit can become locked up in the connected state. Once the

desired timer length is set, enter “* #” to leave the programming mode.

3.7.9 CALLING TIMER

The Calling Timer determines how long the RTU-292 will attempt to place a telephone call.

Once the timer expires, the RTU-292 terminates the attempt. Note that if the unit detects a

busy signal or other feedback that indicates that the call cannot be placed, the attempt will be

immediately terminated.

Two Calling Timer lengths, either 30 seconds or 1 minute, are available. Enter “* 9 9” to enter

the programming mode, then “* 3 x” to set the timer. The value of x sets the Calling Timer

duration. “* 3 0” sets the Calling Timer to the factory default length of 30 seconds. “* 3 1”

sets the timer to 1 minute. Once the desired timer length is set, enter “* #” to leave the

programming mode.

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3.7.10 USING THE RTU-292 SPEED DIAL FEATURE

The RTU-292 has the ability of storing 99 telephone numbers in non-volatile memory. These

numbers may be used when making a call using via UHF/VHF radio with a DTMF keypad. To

use the speed dial feature, simply enter the speed dial number instead of a telephone number.

Note: The Voice Prompt Option is recommended if the speed dial feature is used, but is not

required. Voice prompts are essential in assisting the user in programming, reviewing, and

using the speed dial feature.

3.7.10.1 Programming the Speed Dial Directory

These numbers are programmed by first putting the RTU-292 into the programming mode. To

enter this mode, enter the DTMF command ^“* 9 9”. The RTU-292 will respond with its

“READY” prompt.

1. The user next enters the command “* 4” on the keypad of the RTU-292*, the Local Phone

telephone set or the keypad of a connected telephone.

*See 3.7.6 for special instructions if the front panel keypad is used.

2. The RTU-292 gives the prompt “ENTER SPEED DIAL LOCATION”.

3. The user enters two digits for the speed dial location. A leading 0 is used for locations 1-9.

For example, when the user is programming speed dial location number 1, he must enter

“01”.

4. The RTU-292 gives the prompt “ENTER PHONE NUMBER”.

5. The user enters the digits of the phone number. When complete the user enters a “#”.

6. The user may review the contents of the speed dial directory by entering the command

^“* 5”.

7. When programming is complete, enter the “* #” sequence to take the RTU-292 out of

programming mode.

3.7.10.2 Using the Speed Dial Feature

Operation is the same as standard, except when queried for a phone number by the RTU-292,

the radio enters the speed dial location instead of the telephone number. For example to call

the number stored at speed dial location six, the user enters * 0 6 # (star zero six pound). All

single digit speed dial numbers must be proceeded by a zero as in example provided.

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3.7.11 OPTIONAL 4 WIRE OPERATION

The unit can be set to operate with a four wire device instead of a standard 2 wire phone. The

additional I/O is handled by header J6 on the main PCB. The STU-III option makes use of this

capability. To put the RTU-292, first place the unit in programming mode with the *99

command. Then enter the * 6 1 DTMF command. To return to 2 wire operation, enter * 6 0.

To query the unit for its current setting, enter * 6 # (requires voice prompt option to hear

response from unit). See Table 3-2. When programming is complete, enter * # to exit the

programming mode.

3.8 FACTORY RESET

It’s possible to perform a Factory Reset that will return all user-programmable parameters

(other than the speed dial directory) to the initial factory default settings. This includes the

system password, the Inactivity Disconnect and Calling Timers, etc.

To perform a Factory Reset, hold the 0 (zero) key in on the front panel keypad while the main

power is turned on. After the unit has powered up, let go of the 0 key.

3.9 SPEED DIAL RESET

A Speed Dial Reset completely erases the information in the speed dial directory.

To perform a Speed Dial Reset, hold the 1 (one) key in on the front panel keypad while the

main power is turned on. After the unit has powered up, let go of the 1 key.

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4 RTU-292 Theory Of Operation

4.1 GENERAL

This section gives enough detail of the theory of operation of the RTU-292 audio and power

supply sections to allow them to be troubleshot in the field. The same level of detail is not

supplied for the DSP module and the CPU portion as they are considered impractical to field

troubleshoot because of the specialized knowledge and test equipment required. If a fault is

suspected in these sections, factory repair is required.

4.2 FRONT PANEL BUTTONS AND INDICATORS

Figure 8-1 is a schematic of the RTU-292 front panel. The control pushbuttons and associated

LEDs are arranged in three separate PC board assemblies: the Tel Line Switch Assembly, the

Handset Switch Assembly, and the Speaker Switch Assembly. Signals from each of these

assemblies are combined into one ribbon cable that plugs into the Main Board at J3. Each

control pushbutton switches +5V onto its control line when ON and open circuit when OFF.

Pulldown resistors on each of the control inputs pull the line to ground when its button is OFF.

The buttons are read by the processor on the Main Board. The processor, not the pushbuttons,

controls the unit’s audio gates as well as the front panel LEDs.

4.3 MAIN BOARD

Main Board Circuitry is detailed in Figure 8-2.

4.3.1 AUDIO BUS ARRANGEMENT

The audio switching is bus oriented. Each major bus is named after the output signal that it

carries for distribution with the major buses as follows:

Signal

Name

TEL

Source

Comment

U8C-11

U15B-7

U22D-6

U33A-2

J13-32

Telephone Receive Signal.

Amplified/AGC’d Microphone Signal.

Amplified Radio Receiver Signal.

Telephone Ringer Signal.

DTMF Dialer Output.

MIC

RXA

RING

DTMF

The bus signals are each gain-leveled to a nominal 0 dBm (0.775V rms) average amplitude,

except for the hybrid in/out signals, which are usually at a –12 dBm (0.194V rms). The bus

signals are routed to various destinations through analog gates controlled by signals from the

CPU on the Main Board.

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4.3.2 TELEPHONE INTERFACE CIRCUITS

4.3.2.1 Telephone Send Circuits

Amplifier U1B generates the Telephone Send signal (the audio which is sent down the phone

line from the RTU-292). U1B is configured as an inverting stage with its gain set by a

combination of input and feedback resistors selected by analog gates U4A through U4D. The

send level calibration assumes that there is a 0 dBm signal level at the input to U1B on U8B-

15. (If the setup is done properly, this is assured by the PEAK LED, which is set to flash at a

peak level equivalent to 0 dBm.) The calibration is such that when a 600 Ohm load is placed

on the telephone line terminals, the signal level at TP3 will be 3 dB lower than stated send

signal level. This 3 dB margin allows some headroom for peaks in the program material

without overdriving the phone line.

Resistor R1 establishes the output impedance of the telephone send amplifier, and (in parallel

with R11) determines also the terminating impedance for the phone line.

Zener diodes CR2 and CR3 protect the circuitry in the RTU-292 from high voltage spikes on

the phone line. 1:1 Audio transformer T1 couples the RTU-292 to the phone line. Capacitor

C1 compensates the leakage inductance of the transformer to produce a flat frequency response.

Capacitor C2 keeps the phone line DC current out of T1. Instead of using the secondary of T1

to sink the phone line DC holding current, an active constant current load is used which

consists of CR1, Q1 and Q2 and associated components.

The constant current load provides a means of sinking the DC holding current from the phone

line so that the RTU-292 will seize and hold the line. Bridge CR1 corrects the DC polarity so

that a positive voltage is always applied to the collector of Q1, eliminating the need to be

concerned about the polarity of the phone line. Transistors Q1 and Q2 are connected as a

constant current load and C3 insures that the load does not respond to audio frequencies, so that

the load appears as a very high AC impedance in parallel with the transformer secondary.

When the load is in operation, the DC voltage from TP1 to TP2 will be approximately 4V to

8V.

The phone line connections are made via J1 or the terminal block J12 to relay K1, which, when

the power is off or the unit is in Disconnect, disconnects the phone line from the internal

circuitry. Components L1, L2 and associated capacitors form Pi-Section filters to remove RF

from the normally unshielded phone lines. RV1 is a metal-oxide varistor that limits high

voltage transients that might appear on the telephone line.

4.3.2.2 Telephone Receive Circuits

Amplifier U2A is the telephone receive amplifier, which is arranged as a non inverting stage

and gets its input via R11 from transformer T1. U2B is gain adjustable via a combination of

input and feedback resistors selected by analog gates U6A - U6D. The gain distribution is set

so that, with a 600 Ohm load on the telephone line terminals, the PSTN level stated in the Input

Signal Level Table will produce a -12 dBm signal at U2B-7.

Note that the telephone send signal appears mixed with the telephone receive signal at U2A-1.

Furthermore, the amount of send signal mixed in depends on the telephone line impedance, and

is also frequency dependent. It is the job of the DSP hybrid to remove the telephone send signal

and pass only the telephone receive signal to the transmitter output circuits. The inputs to the

adaptive hybrid are A/D 2 (U1A-1) and A/D 1 (U2B-7). The DSP hybrid essentially subtracts

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the signal at A/D 2 from that at A/D 1 and the difference appears on D/A 1, which is named

TEL after passing through gate U8C.

4.3.2.3 Ring Detector and Tone Ringer

Integrated circuit U7 is an optocoupler that senses the ring voltage on the telephone line. When

a ring voltage is detected, U7-5 goes low with the frequency and cadence of the ring voltage.

This signal is fed to the DSP module on J14-28, where the DSP strips off the ring frequency

and passes the a signal with the ring cadence alone on J14-7 to the ring tone generator circuit.

Circuits U31 and U32 form a tone ringer to provide the audible ring signal for the RTU-292’s

speaker. U32 is a 10 Hz oscillator which frequency-modulates oscillator U31 via R41.

Because of the modulation by U32, U31 switches between about 1000 Hz and 800 Hz at a 10

Hz rate, producing a “warble” tone. Normally, both oscillators are held reset by J14-7. When

ring voltage is detected, J14-7 goes high, allowing the oscillators to run.

4.3.3 RADIO INTERFACE CIRCUITS

4.3.3.1 Receiver Input Amplifier

The input from a receiver is connected to P1-1 and P1-6. Jumper JP1 selects whether the input

is balanced or unbalanced. In Balanced position, the signal is fed to the primary of transformer

T2. In unbalanced position, the signal is fed to U20A through R110 and R111, which provides

a unity gain, AC-coupled input of 47k impedance. R110 and C59 are in the circuit for RF

decoupling. The secondary of T2 is connected to amplifier U20A, configured as a high input

impedance unity gain amplifier. In balanced position, Jumper JP2 determines the input

impedance of the receiver input. In low impedance position, R112 is placed across the

secondary of T2 to make a 600 ohm termination. In high input impedance position, R112 is

removed from the circuit, leaving only the 47k Ohm resistor R113. The output of U20A is fed

to amplifier U20B, a gain adjustable amplifier which sets the receiver input signal level. The

output of U20B is nominally at the level of -10dBm, and the adjustment range of R116 allows -

10 dBm to be produced at U20B-7 with input signals in the range of -40dBm to +10dBm.

4.3.3.2 Transmitter Audio Output

Gain-adjustable amplifier U21A provides the audio output to the transmitter. The adjustment

range of R133 is set so that with 0 dBm audio at U21B-7, the signal on the secondary of T3

(loaded with 600 Ohms) can be adjusted between +10dBm and -40 dBm. Amplifier U21A gets

its input signal from mixer amplifier U21B, which is fed by analog gates U22A, B, C and

U23A and U23B. These gates route prompt, DTMF, microphone and telephone input signals

to the transmitter output.

4.3.3.3 Keying Circuits

The key relay, K2, provides two isolated outputs. Signals /Key Out and KB are the normally

open contacts of both halves of K2. These signals are routed to P1-4 and P1-9 and are shorted

to ground when the key relay is energized.

Signals from /KEY IN and CPU KEY are summed in U24B and drive key relay driver Q4.

Transistor Q5 is driven by the VOX key output from the DSP. U24A ensures that the

microphone key switch will not function unless enabled by the CPU board with the MIC KEY

EN signal.

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4.3.3.4 DTMF Detector

Circuit U25 is a DTMF detector/decoder dedicated to listening for DTMF signals from the

radio. Its input is connected to the leveled radio receive signal at U20B-7. The DTMF data is

read by the processor. A separate DTMF detector running in DSP software listens for DTMF

from the telephone line.

4.3.3.5 FSK Modem

Circuit U26 is a hardware FSK modem that listens for FSK signals from the radio at U20B-7,

and can send FSK signals to the radio from U26-17.

4.3.4 HANDSET/ SPEAKER INTERFACE

4.3.4.1 Microphone Circuit

The handset is connected to J7, with the mic signal appearing on J7-5. Resistors R50 and R51

provide bias current for the electret or carbon microphone element (electret is standard).

Components L3, C20 and L4, C23 provide filtering against conducted RF. Amplifier U13A is

the microphone preamplifier; its output U13A-1 drives the ALC circuit composed of U14A and

U13B. The ALC holds the output level at U13B-7 to about -9dBm over a 30 dB input range.

Amplifier U15B boosts the mic signal level to about 0dBm to drive the MIC bus. Resistor R64

feeds some of the mic signal into the handset earpiece as “sidetone”, so the earpiece doesn’t

sound dead.

4.3.4.2 Speaker and Headphone Circuits

The signals that drive the speaker are selected by analog gates U18A, U18B, and U18C; and

are mixed in amplifier U16A. The output on U16A-1 is fed to the top end of the speaker

volume potentiometer on the front panel. The wiper of the volume pot is fed to the speaker

driver U17 through R89. The ring signal from the tone ringer is mixed via R88 so that it

bypasses the volume pot. (Its amplitude is set separately by R156).

Headphones and handset signals are selected by analog gates U19A, U19B, and U19C; and

mixed in amplifier U16B. Output U16B-7 is applied to the top end of the headphones volume

pot on the front panel. The signal from the pot wiper is fed to amplifier U15A through R65.

The output of U15A drives the handset earpiece through R67 and the headphone jack through

R68.

4.3.5 DSP MODULE

The DSP hardware circuitry is detailed in Figure 8-3. The general purpose of the DSP

hardware is to convert analog signals to the digital domain, operate on and manipulate these

signals digitally using the DSP chip, then convert the result back to analog. In this way, it is

possible to implement functions such as the adaptive hybrid, which would be impossible or

impractical to implement using purely analog techniques. In addition to the DSP chip itself, the

module contains two analog interface chips, static RAM for audio storage and delay, and a

program flash memory chip.

4.3.6 DSP SOFTWARE

The DSP software is contained in a FLASH memory chip located on the DSP module. All of

the following functions are implemented in software by the DSP

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4.3.6.1 Adaptive Hybrid

The adaptive hybrid is the central function of the RTU-292. Its purpose is to separate and

isolate the telephone receive signal by subtracting the telephone send signal from the mixed

telephone send and receive signals. If this subtraction is done perfectly, the telephone receive

signal is completely isolated. The digital adaptive hybrid in the RTU-292, while not achieving

perfection, comes close, and gives as much as 40 dB isolation when measured with a

broadband noise source. Comparable isolation for a conventional hybrid would likely be only

10 dB, measured in the same way.

The adaptive hybrid samples the telephone send signal at A/D 2, samples the mixed telephone

send and receive signals on A/D 1, and outputs the isolated telephone receive signal to the

transmitter output amplifier on D/A 1.

The hybrid function also contains a threshold detector that allows VOX operation when balance

has been achieved.

4.3.6.2 Noise Generator

A pseudo-random noise generator is implemented to speed hybrid adaptation. During the

adaptation cycle, the input receiver audio is switched off by gate U8C, and the noise generator

switched on at gate U8A. The wide bandwidth of the noise assures that the hybrid is adapted

over the full audio bandwidth.

4.3.6.3 Peak Detector

A peak detector monitors the receive audio bus and signals at A/D 2 to flash the PEAK LED on

audio peaks which exceed 0 dBm. This function aids in setting up the RTU-292 with the

proper audio levels.

4.3.6.4 VOX

A VOX (Voice Operated Xmit) function looks at the output of the adaptive hybrid and triggers

if the audio exceeds a preset level. Once triggered, it stays active for a short time to prevent

VOX drop out on pauses between syllables. This is called Hang Time, and is adjustable via

Option Switch SW2-6. The VOX sensitivity is adjustable via Option Switches SW2-4 and

SW2-5.

4.3.6.5 Audio Delay

The output of the adaptive hybrid is delayed before being output to the transmitter output

amplifier. The purpose of the delay is to insure that the transmitter is keyed a sufficient time

before the audio arrives so that the entire first speech syllable is transmitted.

4.3.6.6 DTMF Detector

A DTMF detector is implemented in DSP software that listens to the telephone line signal after

the hybrid.

4.3.6.7 DTMF Generator

A DTMF generator is implemented in DSP software that outputs DTMF digits to the telephone

line for dialing. The output is from J13-32 DTMF, which is routed to gate U9D so it may be

mixed with the signal to be sent to the telephone line in U1A.

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4.3.7 POWER SUPPLY

The power supply is detailed in page 8 of 9, Figure 8-2. It supplies regulated DC voltages of

+5V, +12V, -5V, and -12V from both AC and DC inputs.

4.3.7.1 AC Power Supply

The AC power supply is a conventional passive regulator supply with a small PC mounted line

transformer, T4 which has dual primaries for 115 or 230 VAC operation, and has dual 15 VAC

secondaries which are wired in parallel. T4 and bridge CR36 along with capacitors C120 and

C121 are configured as a positive full wave circuit supplying unregulated +BUS voltage (about

20VDC) to the +12V and two +5V regulators. One +5V regulator, U72, feeds the RTU-292

standard circuits. The other regulator, U71, feeds only the assemblies on the option tray. The

positive regulators are standard three-terminal types, using a finned heatsink for cooling.

The negative voltage is supplied by switching regulator U73, which converts the +BUS voltage

to -12V adjustable by R212.

4.3.7.2 DC Power Supply

The DC power supply allows the RTU-292 to be powered from either a +12V or +24V DC

source as well as the standard AC supply line input. Slide switch S6 configures the supply for

either +12V or +24/28V operation. This circuitry is reverse-polarity protected by schottky

diodes in series with the voltage lines.

If sufficient AC and DC power are simultaneously applied, the unit will draw power from the

AC line only. Its auto take-over feature will draw DC power only if the AC line sags.

The DC supply input is filtered by choke L2 and by capacitors C50 and C51. If the DC input is

+12V, this filtered supply feeds the +BUS directly via CR34, and supplies +12V around U70

via CR33. It also supplies voltage directly to the inputs of the +5V regulators through CR39

and R213, and through CR40 and R214. If the DC input is +24/28V, the +BUS is fed through

emitter follower Q24, which keeps the bus voltage from rising above about +24V when input

voltages of 24V to 32V are used.

4.3.8 CPU

The CPU portion of the main board controls all functions of the RTU-292. This board uses the

front panel switches and keypad, as well as the RS-232 serial communications port and signals

received over the telephone as control inputs. The Main board lights front panel LEDs to

display its current status, and controls the audio gates on the audio portion of the main board to

route signals to their correct destinations. Refer to pages 5, 6 & 7 of Figure 8-2.

The RTU-292 is controlled by microprocessor U46. The program that runs U46 resides in

EPROM U40. The unit’s current status is stored in EEPROM U41. Octal latch U39 creates

address lines A0 through A7 from the data bus and the AS control line. Voltage supervisor

U45 ensures that the microprocessor turns off and on in an orderly manner when power is

turned off and on or during power glitches. RS-232 driver U37 interfaces the microprocessor

with the serial communications port. The /IRQ (interrupt request) signal generated by portions

of U47 and U48 informs the processor when the keypad is under use or a DTMF signal has

been detected by the Audio Board.

Most of the rest of the circuitry comprises I/O devices. U43 and U44 create the chip selects

required to control these devices. U38 sends commands to the optional Voice Prompt Board.

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Bus drivers U60 and U61 are the input devices for the front panel switches; latches U62 and

U63 light the front panel LEDs. Latches U50 through U53 send control signals mainly to the

audio circuit sections. U56 and U57 send inputs to the data bus; U54 and U55 read Option

switches SW1 and SW2. Keypad decoder chip U59 provides the keyboard interrupt and

translates keypad closures before sending them onto the data bus via latch U58.

4.3.9 PROMPT TONE GENERATOR

Timer IC U30 can create tones of 500, 600, 750 or 1kHz, depending on the states of control

signals from the CPU Board DT0 and DT1. The volume of these prompts may be adjusted via

potentiometer R158. U33B, U33C, and U33D route either tone prompt or voice prompt signals

to the circuitry; controlled by the T/V signal from the CPU.

4.4 OPTION INTERFACE BOARD

This board contains the basic databus, power audio, and control lines to operate the various

options that may be installed on the unit on the options tray. See figure 8-4.

4.5 VOICE PROMPT OPTION

The Voice Prompt Option outputs prerecorded voice prompts into the telephone send signal or

into the radio transmit audio output from the RTU-292. See figure 8-5.

4.5.1 SPEECH PROCESSOR

The heart of the voice prompt option board is the speech processor chip, U7. This chip is an

ADPCM (Adaptive Pulse Code Modulation) processor containing built-in A/D and D/A, and

can be used for recording as well as playback. The digitized voice prompts are contained in

EPROM U5, which U7 accesses via data bus AD. The prompt analog audio is output on U7-28

and is passed through amplifiers U9 and U10. These amplifiers are arranged as a five-pole

active low-pass filter which removes remnants of the 8 kHz sampling frequency from the

output audio.

4.5.2 CONTROL PROCESSOR

The control microprocessor is the 68HC11A0, an 8-bit processor running at 8 MHz with a basic

instruction cycle time of 2 microseconds. There is some I/O from the processor chip itself from

Port D (pins 20 to 25) and Port A (pins 27 to 34) which controls the Audio Processor chip. The

control input to the board is to Port E (Pins 43 to 50) from connector J1. The lower eight bits

of the address bus are separated from the data bus by address latch U2.

EPROM U4 is the program memory, a 27C256 providing 16k of address space.

Chip select signals for the various I/O are provided by PEEL U6.

Several devices on the CPU board use a 3.58 MHz clock signal that is provided by crystal Y2

and gates U12B and U12C.

U3 is a reset generator that ensures an orderly power-up sequence for the microprocessor and

associated components. It senses the voltage on the +5V line and generates a reset while the

voltage is below approximately 4.55V. As the voltage rises above the threshold, a delay is

generated by C4 to insure processor clock stability before operation commences. Resistor R5

prevents resetting on short spikes on the 5V line.

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4.5.3 VOICE PROMPT SOFTWARE

The voice prompt board software receives the prompt number command through J1 and

translates it into the prompt address in EPROM U5.

4.6 LOCAL PHONE OPTION

The Local Phone Option allows a standard telephone set to be plugged into an RJ-11C modular

jack at the rear of the RTU-292. This telephone set may then be used to place or receive calls

via the RTU-292 to the PSTN or an associated radio. The Local Phone Option can also be used

to control the RTU-292 remotely, changing various configuration options (see section 3.7).

4.6.1 INTERFACE CIRCUITRY

Amplifier U3A generates the local telephone send signal. This mixing amplifier accepts inputs

from the dial/busy generators U5 and U6, and from the local phone send line. This line from

the audio board, may be the audio from the telephone lines, prompt tones, receiver audio,

sidetone audio or DTMF tones, depending on the state of control gates on the audio board. The

gain is set to produce an approx. -9 dBm level at U3A-1. U3B is configured as a conventional

active hybrid. The local phone send signal is sent to U3B via R8 and R35. The combination

send plus receive signal reaches U3B via R7. The send signal is subtracted from the send plus

receive signal, leaving only the receive signal at the output of U3B.

4.6.2 DIAL/BUSY GENERATORS

Dial/Busy signals are composed of two tones, so a pair of frequency sources, U5 and U6, are

required. Each of these 555 timer ICs provides a square wave output. R30 and C10 set the

frequency of U5 to 460 Hz. The frequency of U6 is 620 Hz when Q2 is off, set by R24 and

C11. When commanded by the CPU Board, Q2 turns on, placing C12 in parallel with C11.

This cuts the frequency of U6 to 350 Hz.

The CPU Board normally holds the timers off, but when a high signal is sent on the DTONE

line, U5 and U6 turn on. Their square wave outputs are smoothed by the RC filter networks

made up of R31, R34, and C18 and R32, R33, and C17.

4.6.3 LOCAL TELEPHONE LINE INTERFACE

Tip and Ring signals are brought to the board on J1. Varistor RV1 limits transients that may

appear on the local phone line. The silent ring trip circuit will sense a voltage drop across R22

if the local phone is taken offhook while it is not ringing (K1 will be in the non-energized state

shown in the schematic). This voltage drop will turn on Q5, which signals the offhook

condition to the CPU board via J1-5.

The local phone is made to ring by the CPU Board when it J1-9 is brought high, turning on Q1

and energizing K1. K1 switches the ring generator U4 onto the telephone line. The ring

cadence is controlled by the CPU Board via the RING signal at J1-2. If the telephone goes

offhook during the ring cycle, the voltage drop across R18 turns on Q3, pulling J1-5 high.

Diodes CR1 and CR2 provide transient suppression for the audio circuitry.

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5 Remote Control Protocol

5.1 GENERAL

Included in this section are instructions for controlling the RTU-292 via its RS-232 serial

communications port. The protocol listed in this section is the standard command set that

accompanies the standard software version. If an RTU-292 is shipped with custom software

that employs different commands, a set of special version notes, including a modified protocol,

will be shipped with the unit.

5.2 RS-232 REMOTE CONTROL OVERVIEW

The RTU-292 may be controlled and monitored remotely via its RS-232 interface. The RS-232

interface consists of RX, TX and Ground only. Hardware and software handshaking are not

used. The serial format is 8 data bits, 1 stop bit, and no parity. The baud rate is controlled

by setting DIP switches on the CPU card. Available baud rates are 300, 1200, 2400 and 9600.

All commands to the RTU-292 and responses sent from the RTU-292 use standard ASCII

characters. All remote commands are terminated with a carriage return (CR) and (optionally) a

line feed (LF). Status information returned from the RTU-292 will always be preceded by a

"%" character, and is also terminated by a CR. This protocol allows control and monitoring of

the RTU-292 via a dumb terminal or a computer program. The commands issued to the RTU-

292 are not case sensitive.

5.3 COMMANDS SENT TO THE RTU-292

The following section describes the operation of each of the RTU-292 remote control

commands. All commands have the format:

cmd <data> <data> ... <data> <CR>

The first string is the command string. The command string must not be preceded by any

space characters. There is at least one blank (space) character after the command string. Any

data that is required by the command follows next. Multiple data sections are delimited by at

least one space. Most commands require that data be presented in a specific order. Finally

the command is terminated by a Carriage Return character (CR). Line feed characters may be

included after the Carriage Return, but they are not necessary.

Examples:

Turn on the Speaker-Radio audio:

SPKR_RAD ON <CR>

Get the firmware revision number:

VER <CR>

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When a command is sent to the RTU-292 it is buffered up and acted on as soon as possible.

Once the command has been executed, the RTU-292 will return a "Status" response. The

format of this status response is explained in greater detail in the section 5.4, "Status Returned

From The RTU-292". The RTU-292 is designed to act on one command at a time. The user

must wait for a response from a given command before entering the next command.

Table 5-1

Command Summary

<CR> …………………………………….

AUTO_ANS <ON|OFF|?> <CR> …….

AUD_RING <ON|OFF|?> <CR> ……..

DATE <ddmmyy> <CR> ………………

DIAL <OPER|LP|number string> <CR>

DISC <CR> …………………………….

+DTMF <number string> <CR> ……….

HS_PH <ON|OFF|?> <CR> ………….

HS_RAD <ON|OFF|?> <CR> ………..

SPKR_PH <ON|OFF|?> <CR> ………

SPKR_RAD <ON|OFF|?> <CR> …….

SD <nn|ALL> <num|.|?> <CR>

Null Command

Auto Answer Command

Audible Ring Command

Date Command

Dial Command

Disconnect Command

Generate DTMF command

Handset Phone Command

Handset Radio Command

Speaker Phone Command

Speaker Radio Command

Speed Dial Command

Tel-Line Phone Command

Tel-Line Radio Command

Time Command

TEL_LINE_PH <ON|OFF|?> <CR> ….

TEL_LINE_RAD <ON|OFF|?> <CR> ..

TIME <hhmmss> <CR> …………..…

VER <CR> ………………………………..

Software Version Command

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5.3.1 NULL Command

<CR>

This command may be used as a quick way to insure that RS-232 communication with the RTU-292 is

functioning. The command has no parameters.

Expected Response: NULL Response.

Example:

<CR>

% E0 <CR>

; Command sent to the RTU-292.

; Status returned from the RTU-292.

5.3.2 Auto Answer Command

AUTO_ANS <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of Auto Answer.

Expected Response: Auto Answer Response.

Examples:

AUTO_ANS ON <CR> ; Command to enable Auto Answer.

%AUTO_ANS ON E0 <CR> ; Status returned showing that Auto Answer is on.

AUTO_ANS ? <CR>

; Command requesting the status of Auto Answer.

%AUTO_ANS OFF E0 <CR> ; Status returned showing that Auto Answer is not enabled.

5.3.3 Audible Ring Command

AUD_RING <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of Audible Ring.

Expected Response: Audible Ring Response.

Examples:

AUD_RING ON <CR>

; Command to enable the audible ring.

%AUD_RING ON E0 <CR> ; Status returned showing that audible ring is on.

AUD_RING ? <CR>

; Command requesting the status of audible ring.

%AUD_RING OFF E0 <CR> ; Status returned showing that audible ring is disabled.

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5.3.4 Date Command

DATE <ddmmyy> <CR>

This command is used to check or set the date on the RTU-292 internal clock. If no parameters are

given the command simply returns the time/date. The parameter format is day (01-31), month (01-12),

year (00-99). Note: the Call Logging Feature must be enabled before use. See 3.7.12.

Expected Response: Time/Date Response.

Examples:

DATE <CR>

; Command requesting the current time and date from the RTU-292.

%01-MAR-98 11:05:20 E0 <CR> ; Status returned indicating that the date is March 1^st‘98, and the time

;11:05 and 20 seconds in the morning.

DATE 051297 <CR>

; Command to set the date to December 5, ’97.

%05-DEC-97 14:18:30 E0 <CR> ; Status returned indicating that the date is December 5^th‘97, and the

time is

; 2:18 and 30 seconds in the afternoon.

5.3.5 Dial Command

DIAL <OPER|LP|number string> <CR>

This command is used to dial a phone number via PSTN line. Note: the RTU-292 must be on-hook to

use this command.

The parameter OPER may be substituted for the number. In this case the call will be placed to the front

panel of the RTU-292. Likewise the parameter LP may also be substituted for the number. This will

cause the call to be routed to the Local Phone option (if installed).

Valid digits for the number string are '0'-'9', the characters * # and ','. The comma character is used to

produce a 2 second pause while dialing. No spaces are allowed in the number string.

Expected Response: Dial Response.

Examples:

DIAL 5551234 <CR>

; Command requesting the RTU-292 to dial the number 5551234.

%DIAL 5551234 E0 <CR> ; Status returned indicating that the number 5551234 was dialed.

DIAL OPER <CR>

; Command requesting the RTU-292 to call the Operator (front panel).

%DIAL OPER E0 <CR> ; Status returned indicating that the call was placed to the Operator.

DIAL LP <CR>

; Command requesting the RTU-292 to call the Local Phone option.

%DIAL LP E4 <CR> ; Error status returned indicating that the Local Phone option is not installed in

this unit.

DIAL 5551234 <CR>

; Command requesting the RTU-292 to dial the number 5551234.

%DIAL 5551234 E5 <CR> ; Status returned indicating that the number could not be dialed because the

unit is

; already off-hook.

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5.3.6 Disconnect Command

DISC <CR>

This command is used to drop the PSTN connections.

Expected Response: Disconnect Response.

Examples:

DISC <CR>

; Command requesting that the PSTN be disconnected.

%DISC E0 <CR> ; Status returned indicating that the PSTN was disconnected.

5.3.7 DTMF Command

DTMF <number string> <CR>

This command is used to generate DTMF tones via the PSTN line. This is useful when the call involves

the use of a calling card or automated phone system. Note: if the PSTN must already be off-hook to

use this command. This is done by using the DIAL command or the TEL-LINE-PH command.

Valid digits for the number string are '0'-'9', the characters * # and ','. The comma character is used to

produce a 2 second pause. No spaces are allowed in the number string.

Expected Response: DTMF Response.

Examples:

DTMF 1234 <CR>

; Command requesting the RTU-292 to generate DTMF for the digits 1 2 3 and

%DTMF 1234 E0 <CR> ; Status returned indicating that DTMF for the number(s) 1234 was generated.

DTMF 1234 <CR>

; Command requesting the RTU-292 to generate DTMF for the digits 1 2 3 and

%DTMF 1234 E6 <CR> ; Status returned indicating that this command can not be used at this time. In

this case ; the RTU-292 is probably still on-hook.

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5.3.8 Handset Phone Command

HS_PH <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of Handset Phone

Expected Response: Handset Phone Response.

Examples:

HS_PH ON <CR>

; Command to enable the Handset Phone path.

%HS_PH ON E0 <CR> ; Status returned showing that the Handset Phone path is enabled.

HS_PH ? <CR>

; Command requesting the status of the Handset Phone path.

%HS_PH OFF E0 <CR> ; Status returned showing that Handset Phone is disabled.

5.3.9 Handset Radio Command

HS_RAD <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of Handset Radio.

Expected Response: Handset Radio Response.

Examples:

HS_RAD ON <CR>

; Command to enable the Handset Radio path.

%HS_RAD ON E0 <CR> ; Status returned showing that the Handset Radio path is enabled.

HS_RAD ? <CR>

; Command requesting the status of the Handset Radio path.

%HS_RAD OFF E0 <CR> ; Status returned showing that Handset Radio is disabled.

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5.3.10 Speaker Phone Command

SPKR_PH <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of the Speaker Phone path.

Expected Response: Speaker Phone Response.

Examples:

SPKR_PH ON <CR>

; Command to enable the Speaker Phone path.

%SPKR_PH ON E0 <CR> ; Status returned showing that the Speaker Phone path is enabled.

SPKR_PH ? <CR>

; Command requesting the status of the Speaker Phone path.

%SPKR_PH OFF E0 <CR> ; Status returned showing that Speaker Phone is disabled.

5.3.11 Speaker Radio Command

SPKR_RAD <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of the Speaker Radio path.

Expected Response: Speaker Radio Response.

Examples:

SPKR_RAD ON <CR>

; Command to enable the Speaker Radio path.

%SPKR_RAD ON E0 <CR> ; Status returned showing that the Speaker Radio path is enabled.

SPKR_RAD ? <CR>

; Command requesting the status of the Speaker Radio path.

%SPKR_RAD OFF E0 <CR> ; Status returned showing that Speaker Radio is disabled.

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5.3.12 Speed Dial Command

SD <nn|ALL> <num|.|?> <CR>

This command is used to program or review data in speed dial memory. There are 99 locations in

speed dial memory. These range from 1 to 99, with location 0 being used by the system as “scratch

pad” memory. The keyword “ALL” may be used in place of the speed dial location to refer to all of

speed dial memory. The second argument allows the speed dial location to be programmed to the

given number string. Valid phone numbers contain the ASCII Text digits “0”-“9” as well as “*” and “#”. If

a period is entered in place of the phone number data, the speed dial location will be erased. The

speed dial location can be reviewed by entering a “?” in place of the phone number.

The phone number may contain up to 25 digits.

Expected Response: Speed Dial Response.

Examples:

SD 1 5551212 <CR>

; Command to program location 1 with the phone number 555-1212.

%SD 1 5551212 E0 <CR> ; Status showing that location 1 is programmed with the number 555-1212.

SD 21 ? <CR>

; Command requesting the contents of speed dial location 21.

%SD 21 5551212 E0 <CR> ; Status showing that location 21 is programmed with the number 555-1212.

SD ALL . <CR>

; Command to delete all locations in speed dial memory.

%SD 1 is empty. E0 <CR> ; Each speed dial location is reported as empty.

%SD 2 is empty. E0 <CR>

…

%SD 99 is empty. E0 <CR>

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5.3.13 Tel-Line Phone Command

TEL_LINE_PH <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of Tel-Line Phone. Note that enabling

Tel-Line Phone will put the PSTN in an Off-Hook status. Disabling Tel-Line Phone will only put the

PSTN back on hook if Tel-Line Radio is also disabled. To quickly disconnect the PSTN use the DISC

command.

Expected Response: Tel-Line Phone Response.

Examples:

TEL_LINE_PH ON <CR>

; Command to enable the Tel-Line Phone path.

%TEL_LINE_PH ON E0 <CR> ; Status returned showing that Tel-Line Phone is enabled.

TEL_LINE_PH ? <CR>

; Command requesting the status Tel-Line Phone.

%TEL_LINE_PH OFF E0 <CR> ; Status returned showing that Tel-Line Phone is disabled.

5.3.14 Tel-Line Radio Command

TEL_LINE_RAD <ON|OFF|?> <CR>

This command is to enable, disable or query the current status of Tel-Line Radio. Note that enabling

Tel-Line Radio will put the PSTN in an Off-Hook status and cause the DSP telephone hybrid to adapt.

Disabling Tel-Line Radio will only put the PSTN back on hook if Tel-Line Phone is also disabled. To

quickly disconnect the PSTN use the DISC command.

Expected Response: Tel-Line Radio Response.

Examples:

TEL_LINE_RAD ON <CR>

; Command to enable the Tel-Line Radio path.

%TEL_LINE_RAD ON E0 <CR> ; Status returned showing that Tel-Line Radio is enabled.

TEL_LINE_RAD ? <CR>

; Command requesting the status Tel-Line Radio.

%TEL_LINE_RAD OFF E0 <CR> ; Status returned showing that Tel-Line Radio is disabled.

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5.3.15 Time Command

TIME <hhmmss> <CR>

This command is used to check or set the time on the RTU-292 internal clock. If no parameters are

given the command simply returns the time/date. The parameter format is hour (00-23), minutes (00-

59), seconds (00-59). The time is set and displayed in 24-hour format. Note: the Call Logging Feature

must be enabled before use. See 3.7.12.

Expected Response: Time/Date Response.

Examples:

TIME <CR>

; Command requesting the current time and date from the RTU-292.

%01-MAR-98 11:05:20 E0 <CR> ; Status returned indicating that the date is March 1^st‘98, and the time

;11:05 and 20 seconds in the morning.

TIME 141830 <CR>

; Command to set the time to 2:18 and 30 seconds in the afternoon.

%05-DEC-97 14:18:30 E0 <CR> ; Status returned indicating that the date is December 5^th‘97, and the

time is

; 2:18 and 30 seconds in the afternoon.

5.3.16 Software Version Command

VER <CR>

This command is used to determine the version of the RTU-292 firmware. The command requires no

parameters.

Expected Response: Version Response.

Example:

VER <CR>

; Command sent to the RTU-292.

%VER 2.00 E0 <CR> ; Status returned from the RTU-292.

This status indicates that the CPU software version is 2.00.

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5.4 STATUS RETURNED FROM THE RTU-292

The following section describes the various responses the user may expect from the RTU-292.

The format of a response string is:

%response <data> <data> ... <data> Exx <CR>

There are 3 types of responses:

• Synchronous, the response is given as a result of receiving a specific command.

• Asynchronous, the response is given because of some change in operating status in the

RTU-292 that was not directly due to a command being issued. In this case the RTU-292

simply volunteers this information without being asked for it.

• Multi, the response may be given as a result of a command being issued to the RTU-292 or

because of a change in the RTU-292 operating status.

Each response always begins with a "%" synchronizing character. This is followed by a

response "name" string. There is no space between the sync character and the response name.

The response name identifies the information to follow. In the case of a Synchronous response,

the response name is often the same as the previous command name. Any response data will

follow the response name string. There is at least one space between each data section. Most

data is presented in a specific order. The last data section is always the response error code.

The error code takes the form "Exx" where "xx" is a number. The various error conditions are

reflected in this number. The error response "E0" signifies that there were no errors. Finally

the response string is terminated by a Carriage Return character.

Table 5-2

Response Summary

% Exx <CR>

NULL Response

%AUTO_ANS <ON|OFF> Exx <CR>

%Radio-Telephone Connection Made dd-MON-yy hh:mm:ss Exx <CR>

%DIAL <OPER|LP|number string> Exx <CR>

%DISC Exx <CR>

%DTMF <number string> Exx <CR>

%Connection dropped, elapsed time: hh:mm:ss Exx <CR>

%HS_PH <ON|OFF> Exx <CR>

Auto Answer Response

Call Starting Response

Dial Response

Disconnect Response

DTMF Response

Elapsed Time Response

Handset Phone Response

Handset Radio Response

Speaker Radio Response

Speed Dial Response

Tel-Line Phone Response

Tel-Line Radio Response

Time/Date Response

Version Response

%HS_RAD <ON|OFF> Exx <CR>

%SPKR_RAD <ON|OFF> Exx <CR>

%SD <nn> <num|”is empty.”> Exx <CR>

%TEL_LINE_PH <ON|OFF> Exx <CR>

%TEL_LINE_RAD <ON|OFF> Exx <CR>

%dd-MON-yy hh:mm:ss <CR>

%VER a.bb Exx <CR>

Call Progress responses are listed in section 5.5.

Response error codes are outlined in section 5.6.

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5.4.1 NULL Response

% Exx <CR>

Type:

Synchronous.

Response To: NULL Command.

This response is given after receiving a NULL command. No data is returned in the response.

Example:

<CR> ; Command sent to the RTU-292.

% E0 <CR>

; Status returned from the RTU-292.

5.4.2 Auto Answer Response

%AUTO_ANS <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Auto Answer Command.

This response indicates the auto answering status.

Examples:

%AUTO_ANS ON E0 <CR> ; Status indicating that auto answering is enabled.

%AUTO_ANS OFF E0 <CR> ; Status returned indicating that auto answering is disabled.

5.4.3 Call Starting Response

%Radio-Telephone Connection Made dd-MON-yy hh:mm:ss Exx <CR>

Type:

Asynchronous.

Response To: Start of a Radio/Telephone call.

This response indicates that a Radio/Telephone call has been started. The response shows the current

time and date. The time is shown in 24-hour format. Note: the Call Logging Feature must be

enabled before use. See 3.7.12.

Examples:

Status indicating that a radio/telephone call has been started on January 10^th’98 at 6:30 and 25

seconds in the morning.

%Radio-Telephone Connection Made 10-JAN-98 06:30:25 E0 <CR>

Status indicating that a radio/telephone call has been started on March 25^th’99 at 2:30 and 25 seconds

in the afternoon.

%Radio-Telephone Connection Made 25-MAR-99 14:30:25 E0 <CR>

The strings representing the month are:

JAN, FEB, MAR, APR, MAY, JUN, JLY, AUG, SEP, OCT, NOV, DEC

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5.4.4 Dial Response

%DIAL <OPER|LP|number string> Exx <CR>

Type:

Synchronous.

Response To: Dial Command.

This response indicates that the given number was dialed.

Valid digits for the number string are '0'-'9', the characters * # and ','. The comma character is used to

produce a 2 second pause while dialing. No spaces are allowed in the number string.

Examples:

%DIAL 5551234 E0 <CR> ; Status returned indicating that the number 5551234 was dialed.

%DIAL OPER E0 <CR> ; Status returned indicating that the call has been placed to the operator (front

panel).

5.4.5 Disconnect Response

%DISC Exx <CR>

Type:

Multi.

Response To: Disconnect Command, Telephone Command (*#) Disconnect, System Initiated

Disconnect

This response indicates that the PSTN, Operator, or Local Phone has been disconnected

Examples:

%DISC E0 <CR>

; Status returned indicating that the PSTN was disconnected.

5.4.6 DTMF Response

%DTMF <number string> Exx <CR>

Type:

Synchronous.

Response To: DTMF Command.

This response indicates that DTMF was generated for the given number.

Valid digits for the number string are '0'-'9', the characters * # and ','. The comma character is used to

produce a 2 second pause. No spaces are allowed in the number string.

Examples:

%DTMF 1234 E0 <CR> ; Status returned indicating that DTMF was generated for the number 1234.

%DTMF 1234 E6 <CR> ; Error status indicating that the unit could not generate DTMF at this time.

Most likely

; due to the fact the unit is still on-hook.

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5.4.7 Elapsed Time Response

%Connection dropped, elapsed time: hh:mm:ss Exx <CR>

Type:

Asynchronous.

Response To: Completion of a Radio/Telephone call.

This response indicates that a Radio/Telephone call has been terminated. The response shows the

elapsed time of the call. The time is shown in 24-hour format. Note: the Call Logging Feature must

be enabled before use. See 3.7.12.

Examples:

Status indicating that a radio/telephone call has finished and the call lasted for 1 hour, 12 minutes, 34

seconds.

%Connection dropped, elapsed time: 01:12:34 E0 <CR>

Status indicating that a radio/telephone call has finished and the call lasted for 0 hours, 10 minutes, 25

seconds.

%Connection dropped, elapsed time: 00:10:25 E0 <CR>

5.4.8 Handset Phone Response

%HS_PH <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Handset Phone Command.

This response indicates the Handset Phone path status.

Examples:

%HS_PH ON E0 <CR> ; Status indicating that the Handset Phone path is enabled.

%HS_PH OFF E0 <CR> ; Status returned indicating that the Handset Phone path is disabled.

5.4.9 Handset Radio Response

%HS_RAD <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Handset Radio Command.

This response indicates the Handset Radio path status.

Examples:

%HS_RAD ON E0 <CR> ; Status indicating that the Handset Radio path is enabled.

%HS_RAD OFF E0 <CR> ; Status returned indicating that the Handset Radio path is disabled.

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5.4.10 Speaker Phone Response

%SPKR_PH <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Speaker Phone Command.

This response indicates the Speaker Phone path status.

Examples:

%SPKR_PH ON E0 <CR> ; Status indicating that the Speaker Phone path is enabled.

%SPKR_PH OFF E0 <CR> ; Status returned indicating that the Speaker Phone path is disabled.

5.4.11 Speaker Radio Response

%SPKR_RAD <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Speaker Radio Command.

This response indicates the Speaker Radio path status.

Examples:

%SPKR_RAD ON E0 <CR> ; Status indicating that the Speaker Radio path is enabled.

%SPKR_RAD OFF E0 <CR> ; Status returned indicating that the Speaker Radio path is disabled.

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5.4.12 Speed Dial Response

%SD <nn> <num|”is empty.”> Exx <CR>

Type:

Synchronous.

Response To: Speed Dial Command.

This response shows the contents of a given speed dial memory location.

Examples:

%SD 5 5551212 E0 <CR> ; Status indicating that speed dial location 5 contains the number 555-

1212.

%SD 21 is empty. E0 <CR> ; Status indicating that speed dial location 21 is empty.

5.4.13 Tel-Line Phone Response

%TEL_LINE_PH <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Tel-Line Phone Command.

This response indicates the Tel-Line Phone path status.

Examples:

%TEL_LINE_PH ON E0 <CR> ; Status indicating that the Tel-Line Phone path is enabled.

%TEL_LINE_PH OFF E0 <CR> ; Status returned indicating that the Tel-Line Phone path is disabled.

5.4.14 Tel-Line Radio Response

%TEL_LINE_RAD <ON|OFF> Exx <CR>

Type:

Synchronous.

Response To: Tel-Line Radio Command.

This response indicates the Tel-Line Radio path status.

Examples:

%TEL_LINE_RAD ON E0 <CR> ; Status indicating that the Tel-Line Radio path is enabled.

%TEL_LINE_RAD OFF E0 <CR> ; Status returned indicating that the Tel-Line Radio path is disabled.

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5.4.15 Time/Date Response

%dd-MON-yy hh:mm:ss <CR>

Type:

Synchronous.

Response To: TIME or DATE Command.

This response indicates the current Time and Date for the RTU-292 internal clock. Note: the Call

Logging Feature must be enabled before use. See 3.7.12.

Examples:

%01-MAR-98 11:05:20 <CR> ; Status returned indicating that the date is March 1^st‘98, and the time is

;11:05 and 20 seconds in the morning.

%05-DEC-97 14:18:30 <CR> ; Status returned indicating that the date is December 5^th‘97, and the

time is

; 2:18 and 30 seconds in the afternoon.

The strings representing the month are:

JAN, FEB, MAR, APR, MAY, JUN, JLY, AUG, SEP, OCT, NOV, DEC

5.4.16 Version Response

%VER a.bb Exx <CR>

Type:

Synchronous.

Response To: Version Command.

This response gives the RTU-292 firmware version data. The data is in the format "a.bb" where "a" is

the major version (0-9), and "bb" is the minor version (00-99).

Example:

^ VER <CR>

; Command sent to the RTU-292 asking for the version data.

%VER 2.00 E0 <CR> ; Status returned from the RTU-292 showing version 2.00 with no errors.

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5.5 CALL PROGRESS RESPONSES FROM THE RTU-292

The following section describes the responses the user may expect from the RTU-292 when

Call Progress is active. Call progress is active whenever the PSTN is “off-hook”.

Table 5-3

Call Progress Responses

%CP_RING Exx <CR>

%CP_BUSY Exx <CR>

%CP_NO_ANS Exx <CR>

%CP_NO_DIALTONE Exx <CR>

%CP_AUTO_ANSWERED Exx <CR>.

Call Progress detects Ringback.

Call Progress detects a Busy signal.

No answer after the DIAL command originated a call.

No dialtone when the DIAL command originated a call.

The RTU-292 has answered an incoming PSTN call

5.6 RESPONSE ERROR CODES

All responses from the RTU-292 include an error code. This error code allows the user to see

if there were any problems with a given command. Unless otherwise noted the user may

assume that a non-zero error code indicates that the command was not acted upon.

Table 5-4

Response Error Codes

No error.

The previous command is unknown.

The previous command was missing required parameter(s).

The previous command had a parameter, which was out of the allowed range for this command.

The previous command requested a resource, which is not available. An example of this would

be a DIAL command sent to the Local Phone option, when the Local Phone option is not

installed.

The previous command requested a resource, which is currently busy. An example of this would

be a DIAL command received when the RTU-292 is already off hook.

The previous command may not be used at this time. An example of this would be a DTMF

command received when the RTU-292 is still on-hook.

A hardware related fault was detected.

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6 Maintenance and Repair

6.1 GENERAL

Included in this section are the Test Procedures and performance evaluation criteria for the

supplied equipment. Also provided is a Fault Analysis Table (Table 6.1) to aid in isolating a

fault. Table 6.2 identifies replaceable parts.

6.2 PREVENTIVE MAINTENANCE

There are no preventive or periodic maintenance requirements for this equipment.

6.3 REPAIR OR REPLACEMENT

The repair or replacement of damaged and/or defective parts generally requires techniques that

are standard in the industry. Carefully examine the equipment to determine the most correct

and least time-consuming method required to make the repair.

6.3.1 GENERAL PRECAUTIONS AND NOTES

1. Disconnect power from the unit before attempting any repair or replacement of components.

2. Replace defective connectors only with identical items.

3. Carefully observe lead dress and component orientation when repairing circuits. Keep

components leads as short as possible.

4. Reference to the component side of a printed circuit board denotes the side of the board on

which the components are mounted. The solder or circuit side refers to the side opposite the

components.

6.4 ALIGNMENT

No alignment is required or possible other than setting levels for the telephone line, receiver

input and transmitter output which are done as a part of the normal equipment setup procedure.

6.5 PERFORMANCE TESTING

This section describes how to test and verify the basic performance of the RTU-292. Extensive

test procedures pin-pointing the location of internal faults to the component level are beyond

the scope of this manual.

6.5.1 TEST EQUIPMENT REQUIRED

1 ea. Audio Signal Generator, 600 Ohm Output

1 ea. Noise Generator or Radio Receiver

(See NOTE below)

1 ea. Audio Voltmeter, Hi-Z Input

(HP 400H or equivalent)

1 ea. Resistor, 560 Ohm to 680 Ohm, 1/4W min

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6.5.2 HYBRID BALANCE MEASUREMENT

The test procedure outlined below allows measurement of the hybrid balance, or trans-hybrid

loss, attainable with the RTU-292. This characteristic determines how much radio receiver

input signal will leak into the transmitter output of the RTU-292. In the test set-up, the noise

generator simulates the radio receiver, the audio voltmeter simulates the transmitter and the

resistor simulates the telephone line. If the hybrid balance were perfect, the trans-hybrid loss

would be and none of the receiver signal would leak into the transmitter (the audio voltmeter in

this set-up would measure nothing except residual noise.)

The RTU-292 trans-hybrid loss specification is at least 30dB when measured with a noise

source with an output bandwidth that matches the RTU-292’s bandwidth. This means that the

noise output measured by the audio voltmeter should be at least 30dB below the noise input to

the RTU-292’s hybrid. The test is performed with a 600 Ohm resistor simulating the phone

line in order to have a repeatable standard impedance on which to base the specification. In

actual use, the hybrid balance of the RTU-292 is excellent into impedances other than 600 Ohm

(such as the complex impedances of the telephone lines) and is far better than any conventional

hybrid under these conditions.

The procedure for this test using a noise generator is listed in paragraph 6.5.2.1. If a noise

generator is not available, the alternate test method that employs an audio signal generator (see

paragraph 6.5.2.2) may be used. Figure 6.1 shows equipment interconnections necessary to

perform this test.

NOTE

The accuracy of the trans-hybrid loss measurement depends on the bandwidth of

the noise generator used to perform the test. It is possible, however, to achieve an

evaluation of the unit to within a few dB tolerance without a commercial noise

generator by using the audio output of an SSB or AM receiver that has no antenna

connected. This type of receiver with a 2.5 to 3.5 kHz SSB IF bandwidth makes

an ideal noise generator for this measurement because the output noise is band

limited by the receiver’s IF filters. (FM receivers, however, have too wide a noise

bandwidth and will produce erroneous results using this procedure.) The

receiver’s noise output should be between -20dBm and 0dBm so that the RTU-

292 can be adjusted for the correct hybrid input level.

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Figure 6-1

Hybrid Balance Test Set-Up

6.5.2.1 Main Hybrid Test Procedure

1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown

in Figure 6.1.

2. Set the PSTN levels for -9 dBm using Option SW2-1, -2, and -3.

3. Start with the following pushbuttons OFF: TEL LINE/PHONE, TEL LINE/RADIO, and

TEL VOX. The positions of the other buttons are unimportant. Place the RTU-292 in set-up

mode by setting SW2-7 ON and then turning on the power. (See paragraph 2.10.1 for further

details about set-up mode.)

4. Adjust the TX Level Adjust, R133, so that the audio voltmeter reads -6dBm (0.387V rms).

This sets the transmit signal output path in the RTU-292 for unity gain if the input level is

correctly set.

5. Adjust the RX Level Adjust, R116, so that the PEAK LED flashes rapidly and is on about

50% of the time. (This is different from the instructions in paragraph 2.10.3, which set the RX

Level Adjust for voice)

6. Remove the unit from Set-up Mode by turning the RTU-292 Main Power OFF, setting SW2-

7 OFF, and then turning the main power back ON.

7. Push the TEL LINE/RADIO button to start the adaptation cycle.

8. When the initial adaptation cycle is complete, the noise output can be read on the audio

voltmeter. The voltage should be less than -37dBm (10.9 mV). The trans-hybrid loss is the

difference between this reading and the approximate -7 dBm noise level.

6-21

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RTU-292 Operations Manual

6.5.2.2 Alternate Hybrid Test Procedure

This alternate test procedure uses a more easily obtainable audio signal generator in place of

the noise generator. While this procedure cannot give a complete picture of the unit’s

performance in actual use, it will allow a determination of whether or not the RTU-292 is

operating properly.

1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown

in Figure 6.1, except use an audio signal generator in place of the noise generator.

2. . Set the PSTN levels for -9 dBm using Option SW2-1, -2, and -3.

3. Start with the following pushbuttons OFF: TEL LINE/PHONE, TEL LINE/RADIO, and

TEL VOX. The positions of the other buttons are unimportant. Place the RTU-292 in set-up

mode by setting SW2-7 ON and then turning on the power. (See paragraph 2.10.1 for further

details about set-up mode.)

4. Adjust the TX Level Adjust, R133, so that the audio voltmeter reads -6dBm (0.387V rms).

This sets the transmit signal output path in the RTU-292 for unity gain.

5. Set the output amplitude of the audio signal generator to about 0dBm (0.775V rms). Adjust

the RX Level Adjust so that the PEAK LED just comes on. This will set the average noise

level into the RTU-292’s hybrid to approximately 0dBm.

6. Remove the unit from Set-up Mode by turning the RTU-292 Main Power OFF, setting SW2-

7 OFF, and then turning the main power back ON.

7. Set the audio generator frequency to about 1 kHz.

8. Push the TEL LINE/RADIO button to start the adaptation cycle.

9. When the initial adaptation cycle is complete, the tone output can be read on the audio

voltmeter. The voltage should be typically less than -50dBm (2.5mV). The trans-hybrid loss is

the difference between this reading and the approximate 0dBm tone level.

NOTE

The reading should be made as soon as the adaptation cycle is complete. The

RTU-292 continuously adapts itself to the conditions to which it is exposed. With

the single tone input presented by this test, the unit will eventually adapt to reject

only this single tone instead of the intended broad range of frequencies. This may

take several seconds to several minutes, and an erroneous reading will result when

this happens. The reading will always be correct (and an accurate depiction of

operation under normal conditions) immediately following the initial adaptation

cycle, since the unit has adapted broad band using its own noise source, and has

not yet had time to adapt to the single tone only.

10. To measure the unit at a different frequency, change the audio generator frequency and

repeat steps 8 and 9.

JPS Communications, Inc.

6-22

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RTU-292 Operations Manual

6.5.3 VOX SENSITIVITY MEASUREMENT

The following test procedure measure the sensitivity of the VOX in the RTU-292. This is the

amplitude of the incoming signal from the telephone line required to trigger the VOX.

Figure 6-2

6.5.3.1 VOX Test Procedure

VOX Sensitivity Test Set-Up

1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown

on Figure 6.2.

2. The PSTN level setting must be known. To determine this, remove the top cover and note

the positions of SW2-1, -2, and -3.

3. Start with the following pushbuttons OFF: TEL LINE/PHONE and TEL LINE/RADIO.

Push the TEL VOX button ON. The positions of the other buttons are unimportant.

4. Set the audio signal generator frequency to 1 kHz with an output amplitude of less than -

40dBm (7.7mV rms).

5. Push the TEL LINE/RADIO button to start the adaptation cycle.

6. When the initial adaptation cycle is complete, slowly increase the audio generator amplitude

until the Keyed LED on the RTU-292 comes on. The audio generator amplitude at this point

(read directly by the audio voltmeter) is the VOX sensitivity. The VOX trip point is dependent

on the setting of the PSTN levels and the VOX sensitivity setting. It should be 16 + 2 dB

below the PSTN setting as listed in the table below:

VOX Sensitivity

MAX

VOX Trip Point

19 + 2 dB below the PSTN setting

16 + 2 dB below the PSTN setting

13 + 2 dB below the PSTN setting

10 + 2 dB below the PSTN setting

MED

LOW

MIN

6-23

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RTU-292 Operations Manual

Table 6-1

Fault Analysis

No LEDs light after power-up

Check for correct setting of DC voltage switch S6. Check for proper polarity of

DC input. (If polarity is reversed, the unit will not be damaged, but will not

operate.

At power-up, the PEAK LED The RTU-292 has failed its self-test function. Check for proper seating of the

flashes at a steady rate and the internal DSP module. Contact JPS Customer Service.

unit does not function properly.

At power-up, POWER LED is DC Voltage selector switch S6 set to default +24/28 VDC setting, but input

lighted, but dim. Unit does not voltage is +12V.

function.

The PEAK LED never flashes The TEL LINE/RADIO button must be ON for the PEAK LED to function.

on radio receiver audio.

Audio input from the receiver is set too low. Adjust RX Input potentiometer

R116 fully CW for maximum input. If LED still does not flash on audio peaks,

check receiver audio connections. If using unbalanced input, be sure that

remaining balanced audio terminal is grounded. See 2.10 for audio adjust

procedures.

The PEAK LED is on nearly Excessive audio level from the radio receiver. Adjust R116, the RX Input

continuously.

potentiometer, CCW. If LED still flashes too often after R116 is fully CCW,

lower audio level at receiver. See 2.10 for audio adjust procedures.

The TEL-LINE/RADIO LED The RTU-292 is having difficulty during initial adaptation cycle. Probable

flashes for more than three noise, conversation, dial tone, or busy signal on the phone line while the unit is

seconds

after

the

TEL- trying to adapt.

LINE/PHONE button is pushed.

The TEL-LINE/RADIO LED The RTU-292 was not able to complete its initial adaptation cycle. Probable

flashes for more than ten extreme noise, dial tone, busy signal, or other type of signal present on the

seconds

LINE/PHONE button is pushed. pushing the TEL LINE/PHONE button.

The VOX does not function. The VOX is disabled while the TEL-LINE/RADIO is not ON.

The VOX is disallowed if the unit has not been able to adapt.

VOX false triggers on audio Excessive audio level from the receiver or overdrive of the phone line. If the

after

the

TEL- phone line. Be certain that a good telephone connection is obtained before

peaks from the receiver.

PEAK LED is flashing normally on receiver voice peaks (see 2.10), check the

setting of the telephone send and receive levels.

Also, extremely bad phone line is possible.

JPS Communications, Inc.

6-24

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RTU-292 Operations Manual

Table 6-2

Replaceable Parts List

5970501000

Chassis Assembly

Part No.

153080001

360003001

362005001

362007000

362008000

370002001

632000010

810811800

1110250002

1610501102

1940120086

1946220001

5962102000

Description

Reference Designator

Speaker, 8 ohm, 3" sq

LS1

Conn, MTA-156, 3-pin, receptacle

Conn, circular, pnl mt receptacle

Conn, cable, 7-pin, AMP

For P4

P8, Keypad conn

P9, P12, P16

J2 (Rear Panel DC Input)

Conn, cable, 8-pin. AMP

Conn, barrier strip, 2 position

AC Filter and Fuseholder Assy

Handle, .25 x 1.25 x 2.75 mtg ctr

Knob, blk w/dot, .250ID

Pot, 5K, lin, 1/4", panel mount

Keypad, Molded Legend, 3 x 4

Sw, lock toggle, DPDT, 6A, Silver

DSP Module, Pcb Assembly

Spkr, phones

S1 (Power switch)

Surface mt. pcb

5930302800

Telephone Line Switch Assembly

Part No.

320220250

327104101

364010101

1221062201

1221062202

1943000003

Description

Reference Designator

Cap, elect, 22uF, 25VDC

Cap, mylar, 0.1uF, 10%, 100V

Conn, Header, .125bd, 10pin, retain

LED, rt angle pc mnt, green

LED, rt angle pc mnt, Yel

Sw, push, mom, 30VDC, .4A

C1,2,4

CR1,CR2

CR4

Sw1,2,3,4

5930302700

Handset Switch Assembly

Part No.

320220250

327104101

364010101

1221062202

1820271000

1943000003

Description

Reference Designator

Cap, elect, 22uF, 25VDC

Cap, mylar, 0.1uF, 10%, 100V

Conn, Header, .125bd, 10pin, retain

LED, rt angle pc mnt, Yel

Resistor, carb, 1/4w, 270 ohm

Sw, push, mom, 30VDC, .4A

C1,2,4

CR1-4

R1-4

SW1-4

5930302500

Speaker Switch Assembly

Part No.

320220250

327104101

364010101

1221062200

1221062202

1820271000

1943000003

Description

Reference Designator

Cap, elect, 22uF, 25VDC

Cap, mylar, 0.1uF, 10%, 100V

Conn, Header, .125bd, 10pin, retain

LED, rt angle pc mnt, Red

LED, rt angle pc mnt, Yel

Resistor, carb, 1/4w, 270 ohm

Sw, push, mom, 30VDC, .4A

C1,2,4

CR3,4

CR1,2

R1,2,3,4

SW1,2,4

Programmed Ics

Part No.

934272XXX

6934029XXX

Description

Reference Designator

U40 (main bd XXX is rev#)

U8 (DSP Module XXX is rev#)

IC, dig, 27C256 32kx8 EPROM

IC, dig, 29C010

6-25

JPS Communications, Inc.

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RTU-292 Operations Manual

5970506100

RTU-292 Main PCB Assembly

Part No.

320010500

320020500

320100500

320101250

320101500

320102350

320152160

320220250

320272350

323100102

323470102

327102101

327103101

327104101

327105100

327474101

327474401

327682101

328332500

364003100

364004100

364007100

364010101

364016101

364040101

364040104

365003102

365004100

365007100

365008100

365010101

367009100

370002000

370006000

370006002

380035800

380080000

420000060

420001040

423058180

426040040

428041480

430062670

432052540

432053590

870504100

910103000

910223000

912101001

920000200

920537700

931074040

931074923

931743740

933074000

Description

Reference Designator

Cap, elect, 1uF, 50VDC

C103

Cap, elect, 2.2uF, 50VDC

Cap, elect, 10uF, 50VDC

Cap, elect, 100uF, 25VDC

Cap, elect, 100uF, 50VDC

Cap, elect, 1000uF, 35VDC

Cap, elect, 1500uF, 16VDC

Cap, elect, 22uF, 25VDC

C3,29,35,125

C91

C21,33,42,80,124,126

C112

C43,44

C128

C96,97,113,115,117,119,123

C34,62,63,65,67,68,69,74,95

C10,11,13,14,15,22,25,26,27,32

C120,121

C92,93

C31

C4-7,24,37,38,39,41,46,47,59,64

C1,20,23,61,66,70,81,85,107,108

C8,9,28,30,40,45,60,71,72,73

C75-78,82,84,90,94,98-102,109

Cap, elect, 2700uF, 35VDC

Cap, disc cer, 10pF, 5%, NPO, 100V

Cap, disc cer, 47pF, NPO, 100V

Cap, mylar, 1nF, 10%, 100V

Cap, mylar, 0.01uF, 10%, 100V

Cap, mylar, 0.1uF, 10%, 100V

Cap, mylar, 1 uF, 10%, 100V

Cap, mylar, 0.47uF, 10%, 100V

Cap, mylar, 0.47uF, 10%, 400V

Cap, mylar, 0.0068uF, 10%, 100V

Cap, poly, 3.3nf, 50V

Conn, Header, 3-pin single row

Conn, Header, 4-pin single row

Conn, Header, 7-pin, single row

Conn, Header, .125bd, 10pin, retain

Conn, Header, Male, 16 Pin retain

Conn, Header, .125, 40 pin, retain

Conn, header, 20x2, 0.250 spc, male

Conn, 3-pin w/notches, .156 center

Conn, pcb, 4 x 1 friction lock

Conn, Header, 7-pin friction lock

Conn, PCB, 8 x 1, friction lock

Conn, header, MTA-156, 10-pin

Conn, DB9, shielded male, pc mount

Conn, misc, 2-pin jumper

Conn, RJ11C Modular Jack, pc mount

Conn, RJ12C, Mod. Jack, PC mt

Crystal, 3.579545 MHz

Crystal, 8.000 MHz

Diode, Bridge, 600V, 1A

Diode, Bridge, 20 PIV, 400 VW, 3A

Diode, Schottky, 1N5818, 1A, 30V

Diode, rect, 1N4004, 400V, 1A

Diode, Signal, 1N4148

Diode, trans sup, 1N6267, 6.8V, 5W

Diode, Zener, 1N5254, 27V

Diode, Zener, 1N5359B, 24V

Heatsink, T0-220, black, 0.85 high

Inductor, molded, small, 10uH, 5%

Inductor, molded, small, 22uH, 5%

Inductor, pwr, 100uH, large

Insulator pad, for crystal

C122,130-155,159-168

C83,110,111,114,116,118,127,129

C12

C87

C36,86

JP1,JP2,JP3

J11

J19 (to Options)

J10,J18,J20

J15

J13,J14

J22

J6,J9,J12,J16

P1,2

JP1-3,J5,J11

J1,J21

Y1,Y2

CR1

CR36

CR30,32-35,38,39,40

CR4,7,8,9

CR12-16,20-23,37

CR2,3

CR5,6

CR31

For U70-72,Q24

L3,4,5

L1,2,6

L7,8,9

For Y1,2,3

For U73

U10,48

U59

U38,50-53,62,63

U24,47,65,66

Insulator, silpad

IC, dig, 74HC04N, hex inverter

IC, dig, MM74C923N, 20 key encoder

IC, dig, 74HC374N, Oct D FF, 3-stat

IC, dig, 74HC00N, quad NAND

JPS Communications, Inc.

6-26

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RTU-292 Operations Manual

5970506100

RTU-292 Main PCB Assembly (continued)

Part No.

933074154

933074244

933074373

933741390

935681101

936074742

939016430

950020020

953118100

953145436

954000820

956005550

958010720

958078050

958078120

959002120

959005720

959043500

959077051

1221062200

1610102000

1611502000

1611503000

1810012014

1820000000

1820010000

1820100000

1820101000

1820102000

1820103000

1820104000

1820105000

1820124000

1820132000

1820152000

1820153000

1820183000

1820202000

1820204000

1820221000

1820222000

1820223000

1820392000

1820470000

1820471000

1820472000

1820473000

1820512000

1820513000

1820561000

1820621000

1820682000

Description

Reference Designator

IC, dig, 74HC154N, 4:16 decoder

IC, dig, 74HC244N, 3-state driver

IC, dig, 74HC373N, octal d latch

IC, dig, 74HC139, 2-4 Decoder

IC, dig, 68HC11A0FN w/o EEPROM

IC, dig, 74ALS74N, Dual D FF, Adv.

IC, dig, DS1643-150, real time cloc

IC, lnr, TDA2002V, 8W audio amp

IC, lnr, LT1181CN 5V RS-232 xcvr

IC, lnr, MC145436, DTMF RCVR

IC, op amp, TL082CP, dual biFET

IC, Timer, NE555

U43,44

U54-57,60,61

U39,58

U42

U46

U64

U41

U17

U37

U25

U1-3,13,15,16,20,21

U30,31,32

U73

U71,72

U70

U4,5,6,8,9,18,19,22,23,33

U14

U7,11,12

U45

CR24

R212

R156,158

R116,133

K1,K2

R131,168,171,176

R15,16,94

R14,92

R59,63,98,175

R50,51,52,95,97

R185-192,197,198,211

R119,136,141,146,165,166,180

R7,10,11,12,17,18,21,32,41,42

R137-139,142,152,157,161-164

R20,23,25,27,36,72,74,76,77

R78,80,82,84,85.86,89123-127

R56,88,145,170

R151

R211

R115,132

R8,55,57,58,62,210

R2,4,37,38,39,40

R200

IC, V reg, LT1072CT, Switching Reg

IC, V.reg, MC7805ACT, 5VDC

IC, V.reg, MC7812ACT, 12VDC

IC, lnr, DG212CJ Quad Analog Gate

IC, lnr, NE572N, Dual Compandor

IC, lnr, 4N35, 6-pin Opto isolator

IC, lnr, TL7705ACP, V superv

LED, rt angle pc mnt, Red

Pot, 1K, single turn, trimpot, pcb

Pot, 25 turn, 5K, vert pc

Pot, 25 turn, 50K, vert pc

Relay, low pwr, DPDT, 12VDC

Resistor, carb, 1/4W, 0 ohm

Resistor, carb, 1/4w, 1 ohm

Resistor, carb, 1/4w, 10 ohm

Resistor, carb, 1/4w, 100 ohm

Resistor, carb, 1/4w, 1000 ohm

Resistor, carb, 1/4w, 10K ohm

Resistor, carb, 1/4w, 100K ohm

Resistor, carb, 1/4w, 1Meg ohm

Resistor, carb, 1/4w, 120K ohm

Resistor, carb, 1/4w, 1300 ohm

Resistor, carb, 1/4w, 1500 ohm

Resistor, carb, 1/4w, 15K ohm

Resistor, carb, 1/4w, 18K ohm

Resistor, carb, 1/4w, 2000 ohm

Resistor, carb, 1/4w, 200K ohm

Resistor, carb, 1/4w, 220 ohm

Resistor, carb, 1/4w, 2200 ohm

Resistor, carb, 1/4w, 22K ohm

Resistor, carb, 1/4W, 3900 ohm

Resistor, carb, 1/4w, 47 ohm

Resistor, carb, 1/4w, 470 ohm

Resistor, carb, 1/4w, 4700 ohm

Resistor, carb, 1/4w, 47K ohm

Resistor, carb, 1/4w, 5100 ohm

Resistor, carb, 1/4w, 51K ohm

Resistor, carb, 1/4w, 560 ohm

Resistor, carb, 1/4w, 620 ohm

Resistor, carb, 1/4w, 6800 ohm

R73,81,154

R91,93

R61,65,90,140,150,153,160

R13,19,24,33,64,66,70,71

R79,118,120,121,128-130,144

R110

R202

R99,167,208

R6,9,26,53,60,96,117,134,155

R159,172-174,179,201,209

R113,143,182,183,193-196

R30,31,35,75,83,87,100,111

R122

R114

R1,34,112,135

R67,68,69

R22,54

6-27

JPS Communications, Inc.

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RTU-292 Operations Manual

5970506100

RTU-292 Main PCB Assembly (continued)

Part No.

1820912000

1821102000

1826020000

1827400050

1828759030

1829101040

1920280000

1920520000

1941008000

1944020001

2020016001

2021334000

2040080200

2043041240

2047070000

Description

Reference Designator

Resistor, carb, 1/4w, 9100 ohm

Resistor, carb, 1/2w, 1000 ohm

Resistor, Varistor, RMS200V

Resistor, ww, 5W, 40 ohm

R3,5,28,29

R207

RV1

R203,204,205,206

R213,214

RP1,2,3,4

For U40

For U46

SW1,SW2

T1,T2,T3

Q1,24

Resistor, pwr ox, 3W, 7.5 ohm

Resistor Pack, 9x100K, 10 pin SIP

Socket, IC, non-ret tin, 28p WDIP

Socket, IC, non-ret, 52 pin PLCC

Sw, pcb, SPSTx8, dip

Sw, slide, DPDT, 6A @ 125VAC

Xfmr, audio, 1:1, min.

Xfmr, Pwr, 115/230 VAC, 34 VAC @ 700mA

Xstr, bipolar, darl, MJE 802, NPN

Xstr, bipolar, sml sig, 2N4124, NPN

Xstr, Fet, n-channel, 2N7000

Q3-8,Q10-23,25,26

JPS Communications, Inc.

6-28

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RTU-292 Operations Manual

7 RTU-292 Options

7.1 GENERAL

Included in this section are installation instructions for field installable RTU-292 options and

set-up instructions for all options that have configuration dipswitches, jumpers, potentiometers,

etc. Operational instructions are provided for all options other than the Voice Prompt Option;

this frequently used options is explained along with standard unit operation in section 3. JPS

may be able to install a software option by connecting with your existing RTU-292 via

telephone; request this service when ordering. Spares kits and the 19” Rack Mount Kit are

listed in section 1.

7.1.1 Special Software Versions

The options listed in the section may or may not be installable in an RTU-292 that has special

software created by JPS to fit a non-standard application. If your RTU-292 has special

software, consult JPS customer service before ordering options.

Table 7-1

RTU-292 Options

Item

JPS P/N

Description

Hardware Options

Local Phone Option

5930-596000

Allows remote operation of the RTU-292 through the use of

a standard telephone set connected directly to the RTU-292

Local Phone port. (Telephone set and cable not supplied.)

DTMF Telephone Set

Voice Prompt Option

VMM-100 Option

5930-599000

5930-595000

5930-591100

Telephone set for use with the Local Phone Option

Standard Version (English, female voice)

Provides DSP Voice Modulation Recognition squelch and/or

DSP Noise Reduction to the radio RX input.

STU-III Option

5960-796000

Allows connection to a STU-III phone

Software Options

Call Logging S/W Option

Radio Control Option

5970-791500

5970-795000

5970-791300

Provides record of calls via RS-232 interface.

Provides remote control of URC-200 radio via RS-232 int.

Squelch Break Access

Option

Allows radio access to the RTU-292 via a series of squelch

breaks

DTMF Access Option

5970-799000

Allows radio access and control via the radio’s DTMF

keypad.

7-1

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RTU-292 Operations Manual

7.2 VOICE PROMPT OPTION

When the Voice Prompt Option is installed, the RTU-292 will send helpful prompts to system

users to guide them in proper system operation and inform them of the current system status.

The standard language is female English, though other languages and genders may be

purchased, an additional fee to create the non-standard prompts is charged. Contact JPS for

details.

7.2.1 INSTALLATION AND CONFIGURATION

The Voice Prompt Option is a small PCB that is installed to four threaded standoffs in the

options tray, with a 20-wire cable from the option to connector J7 on the Options Interface

board, which is also installed in the options tray. Figure 7.1 shows correct option placement in

the options tray.

After the Voice Prompt option is installed, the main CPU must be informed by switching on the

Voice Prompts Enable dipswitch, SW1-6 on the Main Board. Remember that this switch is

only read at unit power-up. No other configuration settings or adjustments are required.

Table 7-2

Voice Prompts Enable

SW1-6

Off

Voice Prompts

Disabled

Enabled

7.2.2 OPERATION

Since the Voice Prompt Option is very commonly used, its operational instructions are included

in section 3, RTU-292 Operation. Theory of Operation information is included in section 4.

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7-2

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RTU-292 Operations Manual

Figure 7-1

Voice Prompt Option Installation

7-3

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RTU-292 Operations Manual

7.3 LOCAL PHONE OPTION

The RTU-292 has an extra rear panel modular phone jack that allows a standard DTMF

telephone set to be plugged directly into the unit when the Local Phone Option is installed.

This Local Phone set can make and receive calls via the outside line, communicate with an

operator at the RTU-292, or send and receive audio through the companion radio. It can also

be used to program the RTU-292. The Local Phone Option consists of a small Printed Circuit

Board assembly that is installed in the RTU-292 options tray. Theory of Operation information

is included in section 4.

7.3.1 LOCAL PHONE OPTION INSTALLATION AND CONFIGURATION

The Local Phone Option is a small PCB that is installed to four threaded standoffs in the

options tray, with a ribbon cable assembly that runs from the option to connector J20 on the

Main Board. Figure 7.2 shows correct option placement in the options tray. The telephone set

and interconnect cable to the telephone set are not included with the option.

After the Local Phone Option is installed, the main CPU must be informed by switching on the

Local Phone Enable dipswitch, SW1-7, on the Main Board. Remember that these switches are

only read at unit power-up. SW1-7 must be left off when the option is not installed. SW1-8

enables the Local Phone Ring-Through feature. This causes the local phone to ring whenever a

call is received by the RTU-292 via the PSTN input. When ring-through is disabled, the local

phone may still be used to send and receive calls, but will not ring when a call is received. Set

SW1-8 to On to enable Local Phone Ring-Through, and Off to disable this feature. This switch

should always be set to Off (disabled) when the Local Phone Option is not installed.

Table 7-3

Local Phone Enable

SW1-7

Off

Local Phone

Disabled

Enabled

Table 7-4

Local Phone Ringthrough

SW1-8

Off

Ringthrough

Disabled

Enabled

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7.3.2 LOCAL PHONE OPTION OPERATION

When the handset of the local phone is picked up, a special dial tone, generated by the RTU-

292, will be heard in its receiver. The user then has three options:

Table 7-5

Local Phone DTMF Commands

Function

DTMF Command

Place a call to the RTU-292 Operator

Connect radio audio to the local phone

Place telephone calls to the outside PSTN line

Once the local phone user has selected a function and entered the associated DTMF character,

he may use any of the keypad commands that are available to a PSTN caller in the command

mode (see Table 3-1). It is important to note that the local phone audio into the RTU-292 does

not run through the unit's DSP circuitry and therefore cannot activate the VOX function.

Always de-activate the VOX function and use the manual key/unkey commands when

communicating over a radio via the local phone (see telephone commands in 3.7.3.4).

Figure 7-2

Local

Phone

Option

Installation

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7.4 VMM-100 OPTION

The VMM-100 VMR Module implements Voice Modulation Recognition (VMR) which

enables the receive audio path when speech is present and disables it when speech is not

present. This module also implements a form of noise reduction known as "dynamic peaking"

which reduces background white noise. These features are implemented with a DSP circuit on

the VMM board.

7.4.1 VMM-100 Hardware

The general purpose of the DSP hardware is to convert analog audio signals to the digital

domain, operate on and manipulate these signals digitally, then convert the result back to

analog.

7.4.1.1 VMM-100 DSP Section

The heart of the DSP section is the DSP chip itself, a TMS320C25. The unit runs at 40 MHz

and produces a 5 MHz signal at the U1-58 CLKOUT, which supplies timing to PEEL U3 and

ultimately to U2, the Analog Interface Chip. U2 then supplies an interrupt to the 320C25

approximately every 130 microseconds, which establishes the sample rate of about 8 kHz. The

DSP operating program is contained in EPROM chips U5 and U6. Two chips provide the

necessary 16-bit-wide architecture; the high byte is contained in U5 and the low byte in U6.

Static RAM chips U9 and U10 are used for temporary data storage during operation of the

program.

All of the "glue" logic necessary to interface the DSP with the various peripheral chips on the

board is provided by PEEL (Programmable Electrically Erasable Logic) U3.

U8 is a reset generator that insures an orderly power-up sequence for the DSP and associated

components. It senses the voltage on the +5V line and generates a reset while the voltage is

below approximately 4.55V. As the voltage rises above the threshold, a delay is generated by

C8 to insure processor clock stability before operation commences. Resistor R2 prevents U8

from resetting on short spikes on the 5V line.

Latch U4 provides an eight-bit parallel output from the DSP. Two of the outputs are used

(NR3 and NR4), while the other six are spare. Latch U12 provides an eight-bit parallel input to

the DSP. Two of the inputs are used (NR1 and NR2), while the other six are spare. Latch U11

provides a means for the DSP to read SW1 switch settings.

7.4.1.2 VMM-100 Analog Interface

Chip U2 provides the analog interface to the DSP section. This chip is type TLC32040 and

contains an A/D converter for the analog input, D/A converter for analog output, and an anti-

alias filter before the A/D, and a reconstruction filter after the D/A. The chip derives its own

timing for these functions from the master clock provided by the DSP. These chips are

interfaced to the DSP via a serial bus.

Amplifier U13 is a dual op-amp that provides gain-of-one buffer amplifiers for the analog

audio input and output.

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7.4.2 VMM-100 Software

The VMM-100 DSP software can provide voice modulation recognition, noise reduction, or

both. The module's operating mode is set by logic inputs at P9 pins 3 and 4

7.4.2.1 VMR Algorithm

The VMR algorithm works by passing the audio through a series of bandpass filters that are

spaced throughout the speech frequency spectrum. The outputs of these filters are then

examined for signals with speech characteristics. If speech is detected, the audio path is

enabled and the LED is lit. The VMR threshold is set by SW1 switches 3 & 4. This threshold

is not volume related; it specifies how stringent the VMR algorithm is when deciding whether a

signal contains speech. The correct setting will depend on many aspects of the incoming signal

and the requirements of the user. A lower threshold setting increases the likelihood that a

signal, which is comparable to speech, but does not actually contain speech, will be passed

through. A higher threshold will eliminate these false detections, but will increase the

possibility that a signal, which contains speech that is strongly masked by noise, will not be

detected.. The default setting should be good for most signals.

The audio output is delayed, allowing speech to be detected before audio arrives, so that no

syllables are missed. SW1 switches 7 & 8 set the duration of the delay. There is also an

adjustable "Hang-Time", which keeps the audio path enabled for an adjustable length of time

after the instant when speech is no longer detected. This hang-time prevents the disabling of

the audio path between syllables or during pauses in speech. SW1 switches 5 & 6 set the hang-

time duration.

7.4.2.2 Noise Reduction Algorithm

The noise reduction algorithm operates by passing the audio through an adaptive FIR (Finite

Impulse Response) filter. The filter forms instantaneous bandpass filters around the relatively

correlated information contained in speech, these filters are not created around non-correlated

white noise, causing it to be suppressed.

7.4.3 VMM-100 INSTALLATION AND CONFIGURATION

The VMM-100 is installed in the options tray opposite from the Options Interface Board. The

holes required for installation are included on the tray, but standoffs are not permanently

installed as this precludes the installation of other options at this location. See Figure 7-3.

Install the board with 6 screws, standoffs, lock washers, and nuts. Install the screws from the

bottom side of the tray. A cable tie-down is also supplied, and the VMM-100 option connector

is assembled to the 10 pin Noise Reduction Connector, J5, on the Options Interface Board.

To set up the VMM-100, place the separate switches of eight-position dipswitch SW1 per

system requirements. The LED on the board can be used to easily set the correct receive audio

level, which is necessary for optimal operation of the VMR and Noise Reduction Modes. This

LED normally indicates when speech has been detected, but when the VMR function is turned

off, this LED becomes a signal level indicator, and will flash on voice peaks when the correct

volume of speech containing signal is present. To use this LED to adjust the volume of the

audio input, turn the VMR function off (see Table 3-1) and inject speech at a normal speaking

level into the module's audio input. Adjust the input volume until the LED lights occasionally

on voice peaks.

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The dipswitches on the VMM-100 module may be changed at any time during operation; the

DSP is constantly checking the states of these switches. The VMR and Noise Reduction modes

can be used individually or simultaneously. They are toggled off & on via standard DTMF

Operational Commands. See section 3.7 and Table 3-1.

Figure 7-3

VMM-100 Option Installation

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Table 7-6

VMM-100 SPECIFICATIONS

GENERAL

Frequency Response

Input Level

100 to 3400 Hz +/- 2dB

0 dBm nominal

Input Impedance

DSP Output Delay

Noise Reduction Type

Noise Reduction

Audio Output

Unbalanced 10k Ohm

< 10mS

Dynamic Peaking around coherent signals

Approximately 10-20 dB

10 Ohm unbalanced, 0 dBm nominal

Less than 0.5% @ 1 kHz

Probability of detection (Pd) > 95% at 0 dB

S/N ratio

Audio Output Distortion

VMR Performance

VMR Output Delay

VMR Hang Time

0-300 ms, adjustable

0.75-2.25 sec, adjustable in half-second

increments

Indicators

Size

Power Requirements

Audio Level/Speech Present LED

5.75" x 3.0" printed circuit board

+5 VDC, 200 mA nominal

+12 VDC, 5 mA nominal

-5 VDC, 20 mA nominal

ENVIRONMENTAL

Operating Temperature

Storage Temperature

Humidity

-20C to +55C

-40C to +85C

Up to 95% @ +55C

Shock

Vibration

Altitude

MIL-STD-810D, method 516.3 procedure VI

MIL-STD-810D, method 514.3 Category I

Up to 10,000 ft.

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Table 7-7

VMM-100 I/O CONNECTOR INFORMATION (P9)

Signal

Audio Input (see specs above)

Audio Output (see specs above)

NR1; Logic Input; Low selects DSP Noise Reduction

NR2; Logic Input; Low selects DSP Voice Modulation Recognition

-5V; Supply Input (see specs above)

+5V; Supply Input (see specs above)

+12V; Supply Input (see specs above)

NR3; Logic Output; Follows state of SW1-1; Low indicates default is NR on

NR4; Logic Output; Follows state of SW1-2; Low indicates default is VMR on

Ground

Table 7-8

VMM-100 Switch Functions

SW1-1 FUNCTIONS

SW1-1,2

For future use; leave off

SW1-3, 4 FUNCTIONS

SW1-3

Off

SW1-4

Off

Threshold

1 (lowest)

2 Factory Default

Off

4 (highest)

SW1-5, 6 FUNCTIONS

SW1-5

Off

SW1-6

Off

Hangtime

0.75 seconds

1.25 Factory Default

1.75

Off

2.25

SW1-7, 8 FUNCTIONS

SW1-7

SW1-8

Delay

0 msec

Off

100 Factory Default

Off

200

300

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7.5 DTMF ACCESS OPTION

This option allows a radio user to use his DTMF keypad to quickly place a telephone call via

the RTU-292. If the user does not have DTMF capability, the Squelch Break Access Option

allows the use a series of squelch breaks to automatically connect to the telephone at speed dial

location #01 (see next section). In the following description, system voice prompts are listed.

If the Voice Prompt Option is not installed, only the tone prompts will be heard.

NOTE

It is possible to enable this option remotely. If you have purchased an RTU-292

without this option and want to add it, contact JPS.

7.5.1 Initiate Call Via Attention Signal

The radio user sends the “Attention” signal to the RTU-292. The attention signal consists of

the DTMF characters “* * *” (three stars).

7.5.2 RTU-292 Response to Attention Signal

The RTU-292 will respond with the voice prompt “RTU-292 automatic phone patch. Enter

phone number followed by the “pound” sign or stand by for auto-call”. The RTU-292 will

also give the Acknowledge (ACK) tones. If Password Protection is enabled, the RTU-292 will

request the correct password prior to asking for the telephone number.

7.5.3 Radio Caller Provides Calling Directions

The radio user can then enter a phone number (terminated by the # sign), or “* n n #” for speed

dial location “nn”. If the caller forgets to enter “#” the RTU-292 will simply wait 4 seconds to

ensure that data entry is complete and then begin to place the call. If no DTMF is detected at

the RTU-292, the unit will place a call to the telephone at the speed dial location #01. This is

an “auto-call”.

7.5.4 RTU-292 Plays Back Phone Number & Prompts for Confirmation

The RTU-292 will play back the number it intends to dial. In the case of speed dial numbers, it

only plays back the speed dial location and not the number stored at that location. The RTU-

292 then prompts the caller for confirmation with the prompt “Please confirm by entering a

single “Star” digit”, along with the Query tone prompt. If the RTU-292 does not receive

confirmation within five seconds, it will give a Timeout prompt and go back to its waiting state.

7.5.5 RTU-292 Places the Call

The RTU-292 then informs the radio user that the call is being placed. The ringback

information that is provided when placing a call via the RTU-292 front panel keypad or Local

Phone is not sent over the air due to FCC regulations. The RTU-292 adapts to the phone line

while placing the call.

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If the number is busy, the busy tones will be broadcast for approximately 5 seconds before the

RTU-292 terminates the call attempt.

Once the RTU-292 detects ringback, the RTU-292 begins a 30 second timer and waits for the

call to be answered. If this does not happen before the timer expires, the call attempt is

terminated.

7.5.6 After the Call Begins

The RTU-292 now enters its "Command Mode", meaning that the phone user may enter any of

the available DTMF commands from Table 3-1. The Inactivity Timer will now begin to run. If

this time expires (due to a lack of speech or other audio activity), the RTU-292 will give a

series of 3 short beeps as a warning. The radio caller or the phone user may initiate activity

within 5 seconds of the warning beeps to reset the timer. If neither user does so, the unit will

then terminate the call.

To terminate the call at any time, the radio user may enter * # at any time. The phone user may

also enter * # to hang up.

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7.6 SQUELCH BREAK ACCESS OPTION

This option allows a radio user who does not have DTMF capability to quickly place a

telephone call via the RTU-292. The radio user simply transmits a series of squelch breaks and

is then automatically connected to the telephone at the RTU-292 speed dial location #01. To

use the squelch break feature, the local radio’s squelch output must be connected to the RTU-

292 /External Signal Input, and the RTU-292 continuously monitors this line for the correct

squelch break timing. The RTU-292 will respond to either a positive going or negative-going

squelch signal.

NOTE

It is possible to enable this option remotely. If you have purchased an RTU-292

without this option and want to add it, contact JPS.

7.6.1 Initiate Call Via Attention Signal

The radio user sends the “Attention” signal to the RTU-292. This is a series of 3 squelch

breaks that occur within 4 seconds window.

7.6.2 RTU-292 Response to Attention Signal

The RTU-292 will respond with the voice prompt “RTU-292 automatic phone patch”. The

Acknowledge (ACK) Tone prompt is also given.

7.6.3 RTU-292 Prompts for Confirmation

The RTU-292 then requests confirmation with the prompt "Please confirm with a single

squelch break”. The caller confirms his desire to call by giving 1 additional short squelch

break within 5 seconds. If the RTU-292 does not receive confirmation within that time, it will

give a "Timeout" tone prompt, terminate the attempt to call, and go back to its waiting state.

7.6.4 RTU-292 Places the Call

The RTU-292 then informs the radio user that the call is being placed. The ringback

information that is provided when placing a call via the RTU-292 front panel keypad or Local

Phone is not sent over the air due to FCC regulations. The RTU-292 adapts to the phone line

while placing the call.

If the number is busy, the busy tones will be broadcast for approximately 5 seconds before the

RTU-292 terminates the call attempt.

Once the RTU-292 detects ringback, the RTU-292 begins a 30 second timer and waits for the

call to be answered. If this does not happen before the timer expires, the call attempt is

terminated.

7.6.5 After the Call Begins

The call can now proceed, and the Inactivity Timer will now begin to run. If this time expires

(because no speech or other activity is heard), the RTU-292 will give a series of 3 short beeps

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as a warning. The radio caller or the phone user may initiate activity within 5 seconds of the

warning beeps to reset the timer. If neither user does so, the unit will then terminate the call.

To terminate the call at any time, the radio user may enter * # or give three squelch breaks

within four seconds. The phone user may enter * # to hang up.

7.7 THE CALL LOGGING OPTION

The RTU-292 contains a Real Time Clock (RTC) IC that allows the logging outgoing

telephone calls via the unit’s RS-232 serial communications port. Full information regarding

the use of this port is provided in section 5. The factory default setting disables Call Logging.

To enable, enter the programming mode by the DTMF sequence * 9 9, then enter * 0 1.

Finally, enter * # to leave the programming mode. See Tables 3-1 and 3-2.

NOTE

It is possible to enable this option remotely. If you have purchased an RTU-292

without this option and want to add it, contact JPS.

7.7.1 Checking The Time And Date

Check both the time and the date by simply entering the remote control command TIME with

no parameters. The time and date that the RTC is set to will be returned. If not correct, set as

explained below. The RTC keeps track of leap years but not daylight savings time.

7.7.2 Setting The Time

Enter the command TIME hhmmss where hh is the hour (00-23), mm signifies the minutes

(00-59), and ss gives the current seconds (00-59).

7.7.3 Setting The Date

Enter the command DATE ddmmyy where dd is the current date (01-31), mm is the month

(01-12), and yy is the last two digits of the year (00-99).

7.7.4 Call Logging

Enable and disable call logging by entering as described above. Once call logging is enabled,

whenever a radio-to-telephone connection is made, a message is sent via RS-232 noting the

beginning of the call and indicating the starting time and date.

When the connection is terminated, another message is sent indicating the time and date and

also listing the elapsed time of the call. The elapsed time is provided in the format hh:mm:ss.

The elapsed time provided will be incorrect if any single radio-to-telephone connection exceeds

24 hours.

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7.8 RADIO CONTROL OPTION

When this software option is enabled, the RTU-292 may be used to control a Motorola URC-

200 radio connected to the unit via the RS-232 serial port. The control commands may be

entered by the RTU-292 front panel keypad, or by the keypad of a connected telephone or by a

telephone set wired to the Local Phone Option. To use front panel keypad control, the LINE-

PHONE and LINE-RADIO pushbuttons must both be off. See 7.7.1 for special instructions

regarding the use of the front panel keypad to send DTMF Commands.

The user must press either the HANDSET-PHONE or HANDSET SPEAKER pushbuttons in

order to hear the accompanying voice prompts.

The unit cannot be put into the DTMF Radio Command Mode unless dipswitch SW1-3 is

turned on. The DTMF Radio Command Mode must then be initiated via the * 8 Operational

Command before these DTMF Commands can be executed. (See Table 3-1.)

When a command has been entered, the RTU-292 will acknowledge the command with a tone

prompt. If an incorrect command is issued the unit plays the ERROR tone and gives the

"Invalid Entry" voice prompt. If the command is correct, but the data is out of range the unit

plays the ERROR tone and gives the "Data Was Not Accepted By The Radio" prompt.

Whenever a valid command is entered, the unit will play back the radio's setting after the

command is sent to the radio. Note that this feature is only available if the Voice Prompt

option is installed. Consult the URC-200 manual for further information regarding the

command descriptions.

NOTE

It is possible to enable this option remotely. If you have purchased an RTU-292

without this option and want to add it, contact JPS.

7.8.1 CONTROLLING THE RADIO VIA THE RTU-292 FRONT PANEL KEYPAD

When a Motorola URC-200 radio connected to the RTU-292 is programmed or controlled by

the RTU-292 via front panel (rather than a connected telephone or the Local Phone Option), the

following special instructions must be heeded. When using the front panel for radio control,

the operator uses the handset and keypad.

To begin front panel control the user must enter three "*" keypresses. The RTU-292 will

respond with an Acknowledge tone prompt and the voice prompt "READY". At this point all

front panel keypad entries are treated just as though the user were sending commands via the

telephone or local phone.

Front panel control operation will continue until one of the following conditions occurs:

• The user enters a "*#" sequence.

• There is neither PTT activity nor keypad activity for the duration of the activity timer.

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While the operator is using the keypad to control the RTU-292, the unit will not be available

for:

• PSTN Auto Answering.

• Radio Squelch Break Access Operation.

• Radio DTMF Access Operation.

• Local Phone Control.

Table 7-9

DTMF Radio Control Commands

These commands are intended to control a Motorola URC-200 radio associated with the

RTU-292. The Radio Control Option must be enabled (See Table 1-2).

Command Followed By

Command Description

* 0

* 1

* 2

* 3

* 4

* 5

* 6

* 7

* 8

* 9 9

* #

[0..9]

[nnnnn]

[0..1]

Channel (preset) select

Frequency Select (both receive and transmit)

Transmit frequency select

Scan mode (0 = scan stop, 1 = scan start)

Reserved for future use

[000..255]

[0..1]

Squelch select

Text mode select (0 = plain text, 1 = cipher text)

Modulation select (0 = AM, 1 = FM)

Power level select (0 = low, 1 = med, 2 = high)

[0..1]

[0..2]

Saves the current radio channel (preset) data.

Leave Radio Command Mode (may be entered at any time).

With all of the above commands (except *3, *99, and *#), the user may substitute the DTMF

"#" character in place of the “Followed By” data to query the radio for its current setting.

For example, if the sequence "* 0 1" is entered, the RTU-292 will command to the radio to

select channel 1. However if the sequence "* 0 #" is entered, the RTU-292 will play back

the current channel number. (The Voice Prompt Option is required to take advantage of this

playback feature.)

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8 SCHEMATIC DIAGRAMS

8.1 GENERAL

This section has all RTU-292 schematic diagrams. They include:

Figure 8-1 Front Panel Schematic

A single sheet showing the switch boards and other front panel components.

Figure 8-2 Main Board Schematic

This nine page schematic details all components on the main board. Notes are included to

differentiate the schematic when the board used in different JPS products, the RTU-292, the

RTU-300 (desktop version), and the RTU-285 (special application version- not for general

sale). There are two different power supply schematics. On the eighth page is the schematic

for the power supply configuration used with the RTU-292 or RTU-300. The ninth page is the

power supply configuration for the RTU-285 only.

Figure 8-3

DSP Module

The DSP Module that plugs into the Main Board via a pair of in-line 20-pin headers has two

schematic pages.

Figure 8-4

Option Interface Board

This is a single-sheet schematic for the narrow PCB that resides in the side of the options tray

and provides an interface between the various standard option boars and the main PCB.

Figure 8-5

Figure 8-6

Figure 8-7

Voice Prompt Option Board

Local Phone Option Board

VMM-100 Option Board

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9 Index

* #.......................................................................3-14, 3-15

* 0................................................................................ 3-14

* 0 x............................................................................. 3-15

* 1................................................................................ 3-14

* 1 x x x #.................................................................... 3-15

* 2................................................................................ 3-14

* 2 x............................................................................. 3-15

* 3................................................................................ 3-14

* 3x.............................................................................. 3-15

* 4................................................................................ 3-14

* 4xx............................................................................ 3-15

* 5.......................................................................3-14, 3-15

* 6................................................................................ 3-14

* 6 x............................................................................. 3-15

* 7.......................................................................3-14, 3-15

* 8.......................................................................3-14, 3-15

* 9................................................................................ 3-15

* 99.............................................................................. 3-14

Call Begins.........................................................7-12, 7-13

Call Logging................................................................ 7-14

CALL PROGRESS RESPONSES FROM THE RTU-292

................................................................................ 5-18

Call Starting Response ................................................ 5-12

CALLING THE RTU-292 VIA THE OUTSIDE LINE.. 3-

CALLING TIMER...................................................... 3-16

Chassis Assembly......................................................... 6-7

Checking The Time And Date..................................... 7-14

Command Summary ..................................................5-2

COMMANDS SENT TO THE RTU-292 ..................... 5-1

CONFIGURATION...................................................... 7-2

CONFIGURING ........................................................... 2-5

CONNECTING THE RADIO TO THE TELEPHONE

LINE ......................................................................... 3-6

CONTINUOUS ADAPTATION .................................. 3-7

Control and Connector Locations................................ 2-19

CONTROL PROCESSOR .......................................... 4-25

COR................................................................................. 9

COS ................................................................................. 9

CPU............................................................................. 4-24

CPU Section.................................................................. 1-3

CTCSS............................................................................. 9

4 wire .......................................................................... 3-15

4 wire operation........................................................... 3-15

AC Power Supply........................................................ 4-24

Accessory Kit............................................................1-4

Adaptation ............................................................... 9, 3-6

ADAPTATION............................................................. 3-7

Adaptive Hybrid.......................................................... 4-23

Adapts To The Phone Line.......................................... 3-11

After the Call Begins..........................................7-12, 7-13

ALIGNMENT............................................................... 6-1

Alternate Hybrid Test Procedure................................... 6-4

ASSEMBLIES .............................................................. 1-2

AUDIBLE RING BUTTON.......................................... 3-3

Audible Ring Command................................................ 5-3

AUDIO BUS ARRANGEMENT................................ 4-19

Audio Delay ................................................................ 4-23

Audio Interface Wiring Diagram................................. 2-22

AUDIO LEVEL SETUP AND ADJUSTMENTS....... 2-15

AUTO ANS BUTTON.................................................. 3-3

Auto Answer Command................................................ 5-3

Auto Answer Response ............................................... 5-12

AUTOMATED OPERATION ...................................... 3-9

Date............................................................................. 7-14

Date Command.............................................................. 5-4

DC INPUT POWER SELECTION ............................... 2-4

DC INPUT TERMINAL BLOCK................................. 3-4

DC Power Supply........................................................ 4-24

Default Settings...........................................................2-3

Dial Command .............................................................. 5-4

DIAL MODE ................................................................ 2-8

Dial Response.............................................................. 5-13

DIAL/BUSY GENERATORS .................................... 4-26

Dialing into the 292..................................................... 3-11

Dimensions.................................................................. 2-18

DIP Switch ...................................................................... 9

Disconnect Command ................................................... 5-5

Disconnect Response................................................... 5-13

Disconnecting (DISCONNECT)................................. 3-10

DSP.................................................................................. 9

DSP Module.................................................................. 1-3

DSP MODULE ........................................................... 4-22

DSP SOFTWARE....................................................... 4-22

DTMF.............................................................................. 9

DTMF ACCESS FEATURE....................................... 7-11

DTMF Command .......................................................... 5-5

DTMF CONTROL COMMANDS.............................. 3-13

BALANCED/UNBALANCED RADIO INTERFACE. 2-7

9-1

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RTU-292 Operations Manual

DTMF Detector.................................................. 4-22, 4-23

DTMF Generator......................................................... 4-23

DTMF Radio Control Commands...........................7-16

DTMF Response ......................................................... 5-13

dynamic peaking ........................................................... 7-6

INACTIVITY DISCONNECT TIMER ...................... 3-16

Initial Adaptation .......................................................... 3-6

Initiate Call Via Attention Signal....................... 7-11, 7-13

INPUT IMPEDANCE................................................... 2-8

INPUT POWER SELECTION ..................................... 2-4

INSPECTION ............................................................... 2-1

Installation..................................................................... 2-1

INSTALLATION AND CONFIGURATION............... 7-2

INSTALLATION CHECKLIST................................. 2-24

INSTALLATION CONSIDERATIONS ...................... 2-2

INSTALLATION OVERVIEW.................................... 2-2

INTERCONNECT INFORMATION ......................... 2-11

INTERFACE CIRCUITRY ........................................ 4-26

Interface Details.......................................................... 2-23

Internal Option Setting Details.................................... 2-21

Internal Option Settings .............................................. 2-20

EIA ...................................................................................9

Elapsed Time Response .............................................. 5-14

Enters the COMMAND Mode .................................... 3-12

Enters The Password................................................... 3-11

ENVIRONMENTAL.................................................... 1-6

Equipment and Accessories Supplied.....................1-4

Factory Default Settings............................................ 2-3

FACTORY RESET..................................................... 3-18

Fault Analysis ............................................................... 6-6

FCC PART 68 REGULATIONS .................................. 2-2

FRONT PANEL BUTTONS AND INDICATORS.... 4-19

FRONT PANEL CONTROLS, INDICATORS AND

CONNECTORS........................................................ 3-1

FRONT PANEL SWITCH ASSEMBLIES .................. 1-3

FSK Modem................................................................ 4-22

Full Duplex ......................................................................9

FULL/HALF DUPLEX RADIO................................... 2-8

J1..................................................................................1-6

J1 TEL LINE................................................................. 3-4

J2..................................................................................1-6

J2 LOCAL PHONE CONNECTOR ............................. 3-4

JUMPERS................................................................... 2-11

Key....................................................................................9

KEY PUSHBUTTON................................................... 3-3

Keying Circuits ........................................................... 4-21

KEYPAD ...................................................................... 3-2

General Information...................................................... 1-1

GENERAL PRECAUTIONS AND NOTES ................ 6-1

Glossary ............................................................................9

LED ..................................................................................9

LINE VOLTAGE SELECTION ................................... 2-4

List Of Figures .................................................................7

List of Tables ....................................................................8

LMR.................................................................................9

LOCAL PHONE / LOCAL PHONE RING-THROUGH 2-

Local Phone DTMF Commands...............................7-5

Local Phone Enable...................................................7-4

LOCAL PHONE OPTION................................... 4-26, 7-4

Local Phone Option Installation.................................... 7-5

LOCAL PHONE OPTION INSTALLATION AND

CONFIGURATION ................................................. 7-4

LOCAL PHONE OPTION OPERATION .................... 7-5

Local Phone Ringthrough..........................................7-4

LOCAL TELEPHONE LINE INTERFACE............... 4-26

Location Of Internal Option Settings .......................... 2-20

Logging....................................................................... 7-14

Half Duplex......................................................................9

HANDSET.................................................................... 3-1

HANDSET BUTTONS................................................. 3-2

HANDSET CONNECTOR......................................... 2-13

HANDSET JACK......................................................... 3-1

Handset Phone Command............................................. 5-6

Handset Phone Response ............................................ 5-14

Handset Radio Command ............................................. 5-6

Handset Radio Response............................................. 5-14

Handset Switch Assembly........................................... 6-7

HANDSET WITH THE RADIO .................................. 3-6

HANDSET/ SPEAKER INTERFACE....................... 4-22

Handset/Speaker Interface............................................. 1-3

Hangtime..........................................................................9

Headphone Circuits..................................................... 4-22

HEADPHONE JACK ................................................... 3-1

HYBRID BALANCE MEASUREMENT .................... 6-2

Hybrid Balance Test Set-Up ......................................... 6-3

MAIN BOARD.................................................... 1-2, 4-19

Main Hybrid Test Procedure......................................... 6-3

Main PCB Assembly ................................................... 6-8

MAIN POWER SWITCH............................................. 3-1

ime/Date Response...................................................... 5-17

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RTU-292 Operations Manual

Maintenance and Repair................................................ 6-1

MANUAL PHONE PATCH PROCEDURE................. 3-7

Microphone Circuit ..................................................... 4-22

MISCELLANEOUS JUMPERS ................................. 2-11

Motorola URC-200 radio ............................................ 7-15

Mute .................................................................................9

PTT.................................................................................10

PUTTING A TELEPHONE CALL ON HOLD............ 3-6

Radio Caller Provides Calling Directions.................... 7-11

RADIO CONNECTION ............................................. 2-12

RADIO CONTROL MODE.......................................... 2-9

RADIO CONTROL OPTION..................................... 7-15

Radio Interface.............................................................. 1-3

RADIO INTERFACE...........................................1-6, 2-7

RADIO INTERFACE CIRCUITS .............................. 4-21

Radio Is Keyed (KEYED)........................................... 3-10

Radio Is Unkeyed (UNKEYED) ................................. 3-10

RADIO TO THE TELEPHONE ................................... 3-6

REAR PANEL CONNECTORS................................... 3-4

RECEIVE LEVEL ...................................................... 2-16

Receiver Input Amplifier............................................. 4-21

RECEIVING A TELEPHONE CALL .......................... 3-6

Recommended Phone Line Settings .......................2-6

REMOTE CONTROL OVERVIEW............................. 5-1

Remote Control Protocol............................................... 5-1

REMOTE KEY ............................................................. 3-9

REPAIR OR REPLACEMENT .................................... 6-1

Replaceable Parts List ................................................... 6-7

RESHIPMENT.............................................................. 2-1

Response Error Codes ............................................5-18

RESPONSE ERROR CODES..................................... 5-18

Response Summary.................................................5-11

Response to Attention Signal .............................7-11, 7-13

Ring Detector and Tone Ringer................................... 4-21

RS-232 CONNECTION.............................................. 2-15

RS-232 REMOTE CONTROL OVERVIEW................ 5-1

RTU-292 Options.........................................................7-1

RTU-292 PASSWORD PROTECTION ..................... 3-16

RTU-292 Places the Call............................................. 7-11

RTU-292 SPECIFICATIONS.....................................1-6

RX...................................................................................10

RX LINE INPUT IMPEDANCE .................................. 2-8

Negative Acknowledge (ERROR)................................. 3-9

Noise Generator .......................................................... 4-23

noise reduction .............................................................. 7-6

NULL Command........................................................... 5-3

NULL Response.......................................................... 5-12

OPERATING THE RTU-292 FROM THE FRONT

PANEL KEYPAD .................................................. 3-13

Operation....................................................................... 3-1

OPERATION .........................................................3-5, 7-2

OPERATION OVERVIEW.......................................... 3-5

OPTION INTERFACE BOARD ................................ 4-25

Option Setting Details ................................................. 2-21

Optional Equipment - Not Supplied..........................1-5

Options.......................................................................... 7-1

OPTIONS...................................................................... 1-5

OPTIONS INSTALLATION AND CONFIGURATION2-

OPTIONS INTERFACE BOARD ................................ 1-3

Outline Dimensions..................................................... 2-18

P1 AC POWER CONNECTOR................................... 3-4

P1 RADIO CONNECTOR............................................ 3-4

P2 RS-232 CONNECTOR ........................................... 3-4

PASSWORD PROTECTION ............................2-10, 3-16

PCB...................................................................................9

Peak Detector .............................................................. 4-23

PEAK LED ................................................................... 3-3

PERFORMANCE TESTING........................................ 6-1

Phone Line Settings...................................................2-6

PHONES VOLUME CONTROL.................................. 3-2

Places the Call............................................................. 7-13

PLACING A CALL IN THE COMMAND MODE:... 3-12

PLACING A TELEPHONE CALL .............................. 3-5

Plays Back Phone Number & Prompts for Confirmation 7-

Positive Acknowledge (ACK)....................................... 3-9

POWER REQUIREMENTS ......................................... 2-4

POWER SUPPLY....................................................... 4-24

Power Supply Section ................................................... 1-3

PREVENTIVE MAINTENANCE ................................ 6-1

Programmed Ics .......................................................... 6-7

Programming Mode DTMF Commands ................3-15

PROGRAMMING MODE SETUP PARAMETERS.... 2-5

Programming the Speed Dial Directory ...................... 3-17

PROMPT TONE GENERATOR ................................ 4-25

Prompts for Confirmation ........................................... 7-13

SCHEMATIC DIAGRAMS.......................................... 8-1

SELF TEST................................................................... 3-9

Send/Receive Levels .................................................2-6

SERIAL PORT BAUD RATE ...................................... 2-9

SETTING TELEPHONE SEND AND RECEIVE

LEVELS ................................................................... 2-5

Setting The Date.......................................................... 7-14

SETTING THE RECEIVE LEVEL ............................ 2-16

Setting The Time......................................................... 7-14

SETTING THE TRANSMIT LEVEL......................... 2-15

SETUP PARAMETERS ............................................... 2-5

Shipping Address........................................................2-1

Simplex...........................................................................10

SNR.................................................................................10

Software Version Command ....................................... 5-10

SPEAKER..................................................................... 3-1

Speaker and Headphone Circuits................................. 4-22

SPEAKER BUTTONS.................................................. 3-3

Speaker Phone Command.............................................. 5-7

9-3

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RTU-292 Operations Manual

Speaker Phone Response............................................. 5-15

Speaker Radio Command.............................................. 5-7

Speaker Radio Response............................................. 5-15

Speaker Switch Assembly........................................... 6-7

SPEAKER TO MONITOR AUDIO ............................. 3-5

SPEAKER VOLUME CONTROL ............................... 3-2

SPEECH PROCESSOR.............................................. 4-25

Speed Dial Command ................................................... 5-8

Speed Dial Directory................................................... 3-17

Speed Dial Feature...................................................... 3-17

SPEED DIAL FEATURE........................................... 3-17

SPEED DIAL RESET................................................. 3-18

Speed Dial Response................................................... 5-16

Squelch...........................................................................10

SQUELCH BREAK ACCESS FEATURE................. 7-13

Standard DTMF Operational Commands .............3-14

STANDARD OPTIONS ............................................... 1-5

STATUS RETURNED FROM THE RTU-292 .......... 5-11

Theory Of Operation................................................... 4-19

Time............................................................................ 7-14

Time Command........................................................... 5-10

TONE PROMPTS......................................................... 3-9

Tone Ringer ................................................................ 4-21

TRANSMIT LEVEL SET-UP MODE........................ 2-11

Transmitter Audio Output........................................... 4-21

TRANSMITTER KEYING, FULL DUPLEX SYSTEM 3-

TRANSMITTER KEYING, HALF DUPLEX SYSTEM3-

TX...................................................................................10

UNPACKING............................................................... 2-1

URC-200..................................................................... 7-15

USING THE CALL LOGGING FEATURE............... 7-14

USING THE HANDSET WITH THE RADIO............. 3-6

Using the Speed Dial Feature...................................... 3-17

Table of Contents .............................................................3

TEL LINE BUTTONS.................................................. 3-2

TEL VOX ..................................................................... 3-3

TELEPHONE ............................................................... 1-6

TELEPHONE CALL ON HOLD.................................. 3-6

TELEPHONE CONNECTION................................... 2-12

Telephone Interface....................................................... 1-2

TELEPHONE INTERFACE CIRCUITS.................... 4-20

TELEPHONE LINE INTERFACE ............................ 1-6

Telephone Line Switch Assembly .............................. 6-7

Telephone Receive Circuits ........................................ 4-20

TELEPHONE RING VOLUME................................... 2-8

Telephone Send Circuits ............................................. 4-20

Telephone Send/Receive Levels ............................. 2-6

Tel-Line Phone Command ............................................ 5-9

Tel-Line Phone Response ........................................... 5-16

Tel-Line Radio Command............................................. 5-9

Tel-Line Radio Response............................................ 5-16

TERMINAL BLOCK .......................................... 2-14, 3-4

TERMINATING A CALL:......................................... 3-12

TEST EQUIPMENT REQUIRED................................ 6-1

The Caller Dials The RTU-292................................... 3-11

The Caller Enters The Password (if enabled ............... 3-11

The RTU-292 Adapts To The Phone Line .................. 3-11

The RTU-292 Enters the COMMAND Mode............. 3-12

Version Response........................................................ 5-17

VMM-100 INSTALLATION AND CONFIGURATION7-

VMM-100 OPTION...................................................... 7-6

VMR....................................................................... 10, 7-6

Voice Modulation Recognition ..................................... 7-6

VOICE PROMPT OPTION.................................4-25, 7-2

Voice Prompt Option Installation.................................. 7-3

VOICE PROMPT SOFTWARE ................................. 4-26

VOICE PROMPTS ............................................ 2-10, 3-10

Voice Prompts Enable ...............................................7-2

VOX...................................................................... 10, 4-23

VOX HANGTIME........................................................ 2-7

VOX SENSITIVITY..................................................... 2-7

VOX SENSITIVITY MEASUREMENT...................... 6-5

VOX Sensitivity Test Set-Up........................................ 6-5

VOX Test Procedure..................................................... 6-5

Waiting For Input (QUERY)....................................... 3-10

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