Nortel Networks Circuit Card 311 - Manual (Page 537)

Introduction 537
Cards later than vintage NT8D09AK support
µ
-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 (
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 supports 56K modem operation.
The analog message waiting line card interfaces to and is compatible with
the equipment listed in
Table 209 "NT8D09 Analog Message Waiting Line
Card application and compatibility" (page 537) .
Table 209
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 (
µ
-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 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.