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“Old” ADPCM Card (702-9153)

Audio Level

No audio adjustments can or need to be made to the Voice Card. It will record audio at

whatever level it goes into the card and replay it at exactly the same level. Still, audio level

is a concern if the Pause Compression option is selected. The adjustment is not difficult:

just make sure that the Trunk card audio level is not so high that background noise causes

the Voice Card to continuously record. The test can be made over a typical phone line - or

preferably a noisy one - while watching the channel light on the Voice Card. Reduce the

audio level until the light is out or only occasionally flickering when you do not speak and

on steadily when you do.

Test Pins (ADPCM Cards 702-0065 and 702-0066)

Five test pins are located near the bottom of the front edge of the ADPCM Voice Card.

The signals available at these points may be of help should a problem develop. These

points are labeled as shown in Table 23.

Table 23: ADPCM Card Test Points

“Old” ADPCM Card (702-9153)

The ADPCM card described in this subsection was discontinued in 2003. It is covered

here in order to support existing paging systems.

Slots

The Voice Card can be plugged into any card slot that has connectors on both the upper

and lower backplanes. On the Model 2200, slot 5 or 6 is normally used; on the Model

2100, slot 4 or 5 is normally used.

Label Function Purpose

1PCM Transmit +

Enable

This TTL signal goes low each time the card is selected by the

system for reading/writing into the dual ported memory area.

2 PCM Data This TTL signal goes low each time the system accesses the voice

storage RAM (read or write cycle).

3 PCM Sync This TTL level signal provides a synchronization pulse for

monitoring the voice program.

4 PCM Clock 4.00 MHz clock signal produced by circuit logic. This TTL signal is

one-fourth of the 16 MHz crystal with 50% duty cycle.

5 GND Signal ground reference for other TEST signals.

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ZETRON 2000 Series Especificaciones Pagina 199