Nortel Circuit Card 311 Reference 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)
line card.
Table 217
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
Frequency response
The loss values in
response" (page 552)
Table 218
Analog message waiting line card - frequency response
Frequency (Hz)
60
200
300
Copyright © 2003-2008, Nortel Networks
.
provides a technical summary of the analog message waiting
600 ohms
1000 ohms at nominal -48 V (excluding set)
30,000 ohms
During silent or ringing intervals
86 V AC
Loop start
Normal battery conditions are continuously applied
(approximately -44.5 V on ring and -2.5 V on tip at nominal -48
V battery)
-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.
6 dB + 1 dB at 1020 Hz
3.5 dB loss for analog to PCM,
2.5 dB loss for PCM to analog
Table 218 "Analog message waiting line card - frequency
are measured relative to the loss at 1 kHz.
Minimum (dB)
20.0
0.0
–0.5
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Maximum (dB)
—
5.0
1.0