Nortel Networks 553-3001-211 manual NT8D09 Analog Message Waiting Line card technical summary

Page 544 of 894 NT8D09 Analog Message Waiting Line card

Table 174 provides a technical summary of the analog message waiting line card.

Table 174

NT8D09 Analog Message Waiting Line card technical summary

Impedance

Loop limit (excluding set)

Leakage resistance

Ring trip

Ringing voltage

Signaling

Supervision

Power input from backplane

Insertion loss

600 ohms

1000 ohms at nominal -48 V (excluding set)

30,000 ohms

During silent or ringing intervals

86 V AC

Loop start

Normal battery conditions are continuously applied (approxi-

mately -44.5 V on ring and

-2.5 V on tip at nominal -48 V battery)

-48 (can be as low as -42 for DC-powered systems), +15, -15, +8.5 V and ringing voltage; also -150 V on analog mes- sage waiting line card.

6 dB + 1 dB at 1020 Hz

3.5dB loss for analog to PCM,

2.5dB loss for PCM to analog

553-3001-211 Standard 2.00 September 2004