Electrical specifications 551
Ringing voltage 86 V AC
Signaling Loop start
Supervision Normal battery conditions are continuously applied
(approximately -44.5 V on ring and -2.5 V ontip 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 message
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
Message channel noise
The message channel noise C-weighted (dBrnC) on 95 percent of theconnections (line to line) with both ends terminated in 600 ohms does notexceed 20 dBrnC.Table217 "NT8D09 Analog Message Waiting Line Card technical summary"(page 552) provides a technical summary of the NT8D09 Analog MessageWaiting Line Card.
Table216
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 Loopstart
Supervision Normal battery conditions are continuously applied
(approximately –44.5 V on ring and –2.5 V on tip at
nominal –48 V battery)
Power input from
backplane –48(can be as lowas –42for dc-poweredsystems),
+15, –15, +8.5 V and ringing voltage; also –150 V
on analog message 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
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
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.