
Page 556 of 906
NT8D09 Analog Message Waiting Line card
553-3001-211 Standard 3.00 August 2005
Table 179 provides a technical summary of the analog message waiting line
card.
Table 179
NT8D09 Analog Message Waiting Line card technical summary
Impedance
600 ohms
Loop limit (excluding set)
1000 ohms at nominal -48 V (excluding set)
Leakage resistance
30,000 ohms
Ring trip
During silent or ringing intervals
Ringing voltage
86 V AC
Signaling
Loop start
Supervision
Normal battery conditions are continuously applied (approxi-
mately -44.5 V on ring and
-2.5 V on tip at nominal -48 V battery)
Power input from backplane
-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.
Insertion loss
6 dB + 1 dB at 1020 Hz
3.5 dB loss for analog to PCM,
2.5 dB loss for PCM to analog
Summary of Contents for Circuit Card
Page 2: ......
Page 4: ...Page 4 of 906 Revision history 553 3001 211 Standard 3 00 August 2005...
Page 18: ...Page 18 of 906 Contents 553 3001 211 Standard 3 00 August 2005...
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