ZETRON 2000 Series Specifications download pdf (Page 200)

Voice Storage System

200 025-9035AA

Address Settings

The ADPCM card has address jumpers that select the I/O address for the card as shown in

the following table (multiple cards share the same memory area).

Mode Settings (ADPCM Card 702-9153)

These configure options for Pause Compression rate and testing modes by using a

software file that is loaded at power-on or boot-up. Consult Zetron 2000 Series

Applications Engineers for specific information.

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 Card 702-9153)

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 the following table.

Jumper Meaning

JP1 A = Card #1

B = Card #2

Label Purpose

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

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

MEM This TTL signal goes low each time the system accesses the voice

storage RAM (read or write cycle).

SYN This TTL level signal provides a synchronization pulse for

monitoring the voice program.

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

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

GND Signal ground reference for other TEST signals.

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ZETRON 2000 Series Specifications Page 200