Nortel Networks 1000 - Manual (Page 436)

436 NT8D02 and NTDK16 Digital Line cards
Table 172
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).
Table 173
Digital line card-power required
Voltage Current (max.)
±5.0 V dc 150 mA
+15.0 V dc 1.6 Amp
–15.0 V dc 1.3 Amp
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).
The digital line card provides +15 V dc over each loop at a maximum
current of 80 mA. It requires +15 V, -15 V, and +5 V from the backplane.
One NT8D06 Peripheral Equipment Power Supply ac or NT6D40
Peripheral Equipment Power Supply dc can supply power to a maximum of
16 digital line cards.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
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