Nortel Networks 1000 User Manual
Page 450
450
NT8D09 Analog Message Waiting Line card
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.
The NT8D09 Analog Message Waiting Line card supports 56K modem
operation.
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 interfaces to and is
compatible with the equipment listed in
Message Waiting Line card application and compatibility" (page 450)
Table 182
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 is an Intelligent
Peripheral Equipment (IPE) line card that can be installed in the NT8D37
IPE module. Up to 16 cards are supported.
The analog message waiting line card provides talk battery and signaling
for up to 16 regular 2-wire common battery analog (500/2500-type)
telephones and key telephone equipment. The card 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. This
voltage is provided by the NT6D40 Peripheral Equipment Power Supply,
DC.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.