Meridian Nortel 1 Option 11C Technical Reference Manual page 375

Table 111
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
NT8D09 Analog Message Waiting Line Card
Table 111 provides a technical summary of the analog message waiting line
card.
Normal battery conditions are continuously applied (approxi-
-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-
600 ohms
1000 ohms at nominal -48 V (excluding set)
30,000 ohms
During silent or ringing intervals
86 V AC
Loop start
mately -44.5 V on ring and
-2.5 V on tip at nominal -48 V battery)
sage waiting line card.
6 dB + 1 dB at 1020 Hz
3.5 dB loss for analog to PCM,
2.5 dB loss for PCM to analog
Option 11C and 11C Mini
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Technical Reference Guide