Nortel Circuit Card Installation Manual page 548

Page 548 of 906
553-3001-211 Standard 3.00
NT8D09 Analog Message Waiting Line card
Note: A maximum of four NT8D09 Analog Message Waiting Line
cards per MG 1000S and four NT8D09 Analog Message Waiting Line
cards per MG 1000S Expansion are supported.
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, that port should not be defined in
software (LD 10) as having message waiting capabilities.
Otherwise, the modem will be damaged.
The NT8D09 Analog Message Waiting Line card interfaces to and is
compatible with the equipment listed in Table 177.
Table 177
NT8D09 Analog Message Waiting Line card application and
compatibility (Part 1 of 2)
Equipment
500-type rotary dial sets (or equivalent):
dial speed
percent break
interdigital time
2500-type Digitone sets (or equivalent):
frequency accuracy
pulse duration
August 2005
Specifications
8.0 to 12.5 pps
58 to 70%
150 ms
+ 1.5%
40 ms