Nortel Networks Circuit Card 311 User Manual
Page 521
Technical summary
521
Characteristics
Description
Loop limits
0 to 1067 m (3500 ft.) with 24 AWG
PVC cable (±15 V dc at 80 mA)
Maximum ac Signal loss
15.5 dB at 256 KHz
Maximum dc Loop resistance
210 ohms
Transmitter output voltage:
successive "1" bits
+1.5 ± 0.15 V and –1.5 ± 0.15 V
"0" bits
0 ± 50 mV
Table 244 "Environmental specifications" (page 684)
provides specifications
for the 16 digital line interfaces, and
Table 200 "Digital line card-power
lists the maximum power consumed by the NT8D02
Digital Line Card.
Table 198
NT8D02 Digital Line Card - line interface unit electrical characteristics
Characteristics
Description
Units per card
16 voice, 16 data
Line rate
512 kbps ± 100 ppm
Impedance
100 ohms
Loop limits
0 to 1067 m (3500 ft.) with 24 AWG
PVC cable (±15 V dc at 80 mA)
Maximum ac Signal loss
15.5 dB at 256 KHz
Maximum dc Loop resistance
210 ohms
Transmitter output voltage:
successive "1" bits
+1.5 ± 0.15 V and –1.5 ± 0.15 V
"0" bits
0 ± 50 mV
Power requirements
The digital line card needs +15V DC over each loop at a maximum current
of 80 mA. It requires +15V, -15V, and +5V from the backplane. The line
feed interface can supply power to one loop of varying length up to 1070 m
(3500 ft) using 24 AWG wire with a maximum allowable AC signal loss of
15.5 dB at 256 kHz, and a maximum DC loop resistance of 210 ohms; 26
AWG wire is limited to 745 m (2450 ft).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.