Additional Materials Required - Valcom V-9923B Instruction Manual

Code call unit

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Table of Contents

Nominal Timing and Frequency

Specifications

The timing and frequency specifications of the

Valcom V-9923B Code Call Unit are shown in

Table 1. Figure 1 is a timing chart showing the

nominal timing of a code call.

Table 1

Dial Tone Frequency

Coded Tone Frequency

Time Tones Broadcast

Time between tones in a sequence

Time between digits in a sequence

Time between series of digits

The Valcom V-9923B will detect 20-30Hz ringing

on the answer port. The applied ringing voltage

should be 75 to 125VAC.

T ONE ON

T ONE OFF

"3"

SEQU ENC E

BEGIN S

180Hz

550Hz

370ms

500ms

1.5 sec

8 sec

.37 s ec.

.50 sec.

1.5 sec.

"1"

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, nursing homes

•

Noisy locations, manufacturing plants

•

Schools, universities