Valcom V-9923B Dokumentacja Pobierz pdf (Strona 2)

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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, nursing homes

• Noisy locations, 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

.37 sec.

.50 sec.

1.5 sec. 1.5 sec. 8 sec.

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

SEQUENCE

BEGINS

SEQUENCE

BEGINS

AGAIN

CONTINUES UNTIL

NSWERED OR

CALLING PARTY

GOES ON HOOK

FIGURE 1

1 2 3 4 5 6 7 8

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