Nortel Networks 1000 - Manual (Page 451)

Introduction 451
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 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 (
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 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.