Nortel Networks Circuit Card - Manual (Page 548)

Page 548 of 906 NT8D09 Analog Message Waiting Line card
553-3001-211 Standard 3.00 August 2005
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.
The NT8D09 Analog Message Waiting Line card interfaces to and is
compatible with the equipment listed in Table 177.
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.
Table 177
NT8D09 Analog Message Waiting Line card application and
compatibility (Part 1 of 2)
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