Nortel Networks 1000 User Manual

Page 451

Introduction

451

Cards later than vintage NT8D09AK support

-Law and A-Law

companding, and provide a 2 dB transmission profile change. The
transmission change improves performance on long lines, particularly for
lines used outside of a single-building environment.

CAUTION

Damage to Equipment

If a modem is connected to a port on the message waiting
line card, do not define that port in software (LD 10) as having
message waiting capabilities. Otherwise, the modem gets
damaged.

The NT8D09 Analog Message Waiting Line Card (

-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 supports 56K modem operation.

The analog message waiting line card interfaces to and is compatible with
the equipment listed in

Table 183 "NT8D09 Analog Message Waiting Line

Card application and compatibility" (page 451)

Table 183
NT8D09 Analog Message Waiting Line Card application and compatibility

Equipment

Specifications

500 type rotary dial sets (or equivalent):

dial speed

8.0 to 12.5 pps

percent break

58 to 70%

interdigital time

150 ms

2500 type Digitone sets (or equivalent):

frequency accuracy

+ 1.5%

pulse duration

40 ms

interdigital time

40 ms

speed

12.5 digits/s

The NT8D09 Analog Message Waiting Line Card (

-Law) provides an

interface for up to 16 analog (500/2500-type) telephones with the Message
Waiting lamp feature.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008