Message Channel Noise - Nortel NT5K02 Description

10 Technical summary
NT5K02 and NT8D03 Analog Line Cards 553-3001-161
Table 2
NT8D03 Analog Line Card frequency response
Frequency (Hz)
60
200
300
3000
3200
3400

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 3 provides a technical summary of the analog line card.
Table 3
NT8D03 Analog Line Card technical summary
Characteristics
Impedance
Loop limit (excluding
telephone)
Leakage resistance
Ring trip
Ringing voltage
Signaling
Supervision
Power input from
backplane
Insertion loss
Minimum (dB)
20.0
0.0
-0.5
-0.5
-0.5
0.0
Des cription
600
1000 at nominal -48 V (excluding telephone)
30,000
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
4 dB +1 dB at 1020 Hz
3.5 dB loss for analog to PCM
0.5 dB loss for PCM to analog
Maximum (dB)
—
5.0
1.0
1.0
1.5
3.0