Valcom V-9923B Service Manual

V-9923B

CODE CALL UNIT

INTRODUCTION

This manual provides instructions for identification, installation, operation, and technical assistance for the Valcom V-9923B Code Call Unit.

The V-9923B provides two or three digit code call paging via a loop start trunk port on a PABX or by the use of a spare line button on a key system.

The V-9923B code call unit complies with Part 68 of the FCC Rules and Regulations and has been granted FCC Registration #BAFUSA-68753-KX-N. The ringer equivalence is 0.1B and the unit requires a USOC RJ21X connector.

In accordance with FCC Rules and applicable tariffs, this code call unit may only be installed with the authorization of the owner of the host system.

The FCC Registration #BAFUSA-68753-KX-N, will be listed in the affidavits filed with the telephone company; it will also be recorded in the system log kept by installation and maintenance personnel. The local telephone company is to be notified of the FCC registration number when this code call unit is installed.

SPECIFICATIONS

The V-9923B is capable of providing code signaling for paging purposes; it provides for "meet me" answer of code call and provides talk circuit and signaling tone.

VSP-V-9923B

Issue 3

• Dial tone to calling party

• Coded tone output for paging systems

• Switch controlled code verification tone

• Automatically discontinues code sending when

answered

• Capable of being used with another V-9923B to

provide two link operation

• Uses standard 1A2 key system voltages

• Mounts on the wall, in a key cabinet, or in the

PABX Cabinet

Capacity

Each V-9923B Code Call Unit provides the necessary equipment for 1 link of code call. For an additional link of code call, another V-9923B is required (two links maximum).

Dimensions

7.1"H x 5.9"W x 2.1"D (18.03cm H x 14.99cm W x 5.33cm D)

Features

• Trunk level access on PABX's, station level

answer

• Can be used with 1A2 type key systems

• 81 two digit codes or 729 three digit codes

• Uses rotary or tone dial signaling

Power Requirements

The Valcom V-9923B requires –24 Vdc talk battery and –24 Vdc signal battery. The current consumption and voltage range is sho wn in Table 1.

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Table 1

Range Idle Operating "A" Battery –21.5 to –26 Vdc 65mA "B" Battery –21.5 to –26 Vdc 125mA

Nominal Timing and Frequency Specifications

The timing and frequency specifications of the Valcom V-9923B code call unit are shown in Table

2. Figure 1 is a timing chart showing the nominal timing of a code call.

Table 2

Dial Tone Frequency 180 Hz Coded Tone Frequency 550 Hz Time Tones Broadcast 370 ms Time between tones in a sequence 500 ms Time between digits in a sequence 1.5 sec Time between series of digits 8 sec

The Valcom V-9923B will detect 20-30 Hz ringing on the answer port. The applied ringing voltage should be 75 to 125 Vac.

DESIGN

The V-9923B provides two or three digit code call paging via a loop start trunk port on a PABX or by the use of a spare line button on a key system. Figure 2 is a simplified block diagram showing the code call unit and its connections.

NOTE: The code call unit is designed so that it will complete a code call sequence before resetting and returning dial tone, even if all parties hang up.

Application

Key systems and PABX's used in:

• Department stores/shopping centers

• Hospitals, nur si ng homes

• Noisy locatio ns, manufacturing plants

• Schools, universities

Additional Materials Required

Additional equipment is required to complete a system when using the V-9923B. These items are:

• -24 Vdc power supply (if existing supply

inadequate or non-existent)

• 66 type connecting block

• 25 pair cable with a female amphenol connector

on one end

• twisted pair crossconnect wire

TONE ON

TONE OFF

SEQUE NCE BEGINS

.37 sec.

.50 sec.

1.5 sec. 1.5 sec. 8 sec.

"3" "1" "2" "3" "1"

SEQUENCE BEGINS AGAIN

FIGURE 1

CONTINUES UNTIL ANSWERED OR CALLING PARTY GOES ON HOOK

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PBX OUTGOING LOOP START CO TRUNK

SPARE LINE BUTTON

ON KEY TELEPHONE

USED WITH PBX

USED W ITH 1A2 KEY SYSTEM

10K

ACCESS

PORT

INH

FIGURE 2

-9923B

CODE CALL

TO –24 Vdc AND 10 Vac POWER SUPPLIES

ANSWER PORT

EP1

TO NEXT V-9923B CODE CALL UNIT IF EQUIPPED

OUT

EP2AB AG BB BG LS

TO RO

TT RT

ANALOG

STATION

CIRCUIT

TONE OUTPUT

TO PAGING

SYSTEM

SWITCHED

RELAY

OUTPUT

PBX

INSTALLATION

Precautions

All precautions have been taken at the factory to insure that the equipment functions properly when installed correctly. Please follow the precautions listed below before applying power to the equipment or the equipment may be damaged and the warranty voided.

a) If power was previously connected,

disconnect or remove power before inserting or removing unit from the amphenol connector.

b) Exercise caution when crossconnecting

wires that two adjacent terminals are not bridged together.

c) Double check all connections before

applying power.

d) Use twisted pair wire for all connections.

Mounting

The Valcom V-9923B code call unit may be mounted in a key cabinet relay rack or on the wall near the distribution frame. When choosing a location, it is necessary that the loop resistance of the PABX or key system are not exceeded.

Mount the unit in a vacant space in an equipment cabinet, rack, or key system cabinet, allowing enough room at the rear of the unit to plug in an amphenol connector. Mount a 66B type punchdown block near the unit and label it per Figure 3.

Run a 25 pair cable with a female connector from the unit to the connecting block. The cable should be terminated on the connecting block in standard color code order on a row of the connecting block. Verify

all connections before p lugging the amphenol end of the cable into the V-9923B code call unit.

Connections to PABX

The connections required to connect the V-9923B to a PABX are shown in Figure 4. The V-9923B requires a loop start trunk port from the PABX for access. If more than one link of code call is being provided, the second V-9923B would require a trunk also and the two trunks should be in a hunt group within the PABX. This arrangement allows access to the second V-9923B if the first V-9923B is in use.

NOTE: ADVISE PERSONNEL USING CODE CALL UNIT TO ALWAYS WAIT FOR DIAL TONE FROM CODE CALL UNIT BEFORE DIALING IN CODE NUMBER!

To answer the code call requires a station from the PABX. If two code call units are being used, two stations would be required and they would have to be in a rotary hunt gro up also.

Connections to Key Systems

The connections required to connect the V-9923B to a 1A2 key system are shown in Figure 5. The T, R, A and L leads are multiplied to all phones in the system. Use a spare pick-up button and install a 10K ohm 1/4 watt 5% resistor either in the phone or at the connecting block in series with the A lead from each phone. The V-9923B will discontinue the code call paging when it recognizes two phones off hook with two 10K ohm resistors to ground on the A leads.

NOTE: WHEN USING 1A2 KEY TELEPHONES, THE TO AND RO LEADS THAT WERE USED FOR PABX CONNECTION ARE NOT USED.

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