NT8D09Analog Message Waiting Line Card Page375 of 544
Option11C and 11C Mini TechnicalReference Guide
Table111 provides a technical summary of the analog message waiting line card.Table 1 11
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