Nortel Networks Circuit Card 311 User Manual
Page 552
552
NT8D09 Analog Message Waiting Line card
Message channel noise
The message channel noise C-weighted (dBmC) on 95 percent of the
connections (line to line) with both ends terminated in 600 ohms does not
exceed 20 dBmC.
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 217 "NT8D09 Analog Message Waiting Line Card technical summary"
(page 552)
provides a technical summary of the analog message waiting
line card.
Table 217
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
Frequency response
The loss values in
Table 218 "Analog message waiting line card - frequency
are measured relative to the loss at 1 kHz.
Table 218
Analog message waiting line card - frequency response
Frequency (Hz)
Minimum (dB)
Maximum (dB)
60
20.0
—
200
0.0
5.0
300
–0.5
1.0
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.