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Option 11C and 11C Mini Technical Reference Guide
376
Chapter 19 — NT8D09 Analog Message
Waiting Line Card
Contents
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
Description
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.