Nortel Networks 1000 - Manual (Page 467)

Electrical specifications 467
Table 189
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
(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 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 the
connections (line to line) with both ends terminated in 600 ohms does not
exceed 20 dBrnC.
Table 191 "NT8D09 Analog Message Waiting Line Card technical
summary" (page 468)
provides a technical summary of the NT8D09
Analog Message Waiting Line Card.
Table 190
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
(approximately –44.5 V on ring and –2.5 V on tip at
nominal –48 V battery)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.