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Chapter 19 - NT8D09 Analog Message
Waiting Line Card
Contents
Description
This section contains information on the following topics:
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Physical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
Functional . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373
Technical summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Analog line interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Foreign and surge voltage protections . . . . . . . . . . . . . . . . . . . . . . . . . . 376
Overload level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376
The NT8D09 Analog Message Waiting Line Card (µ-Law) provides talk
battery and signaling for regular 2-wire common battery 500-type (rotary
dial) and 2500-type (Digitone dial) telephones and key telephone equipment.
The analog message waiting line card is functionally identical to the NT8D03
Analog Line Card, except that it can also connect a high-voltage, low-current
feed to each line to light the message waiting lamp on telephones equipped
with the Message Waiting feature.
The analog message waiting line card will support 56K modem operation.
Option 11C and 11C Mini
Page 371 of 544
Technical Reference Guide
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