Power Requirements; Foreign And Surge Voltage Protections - Meridian Nortel 1 Option 11C Technical Reference Manual

Page 370 of 544

Power requirements

Foreign and surge voltage protections

553-3011-100 Standard 14.00
NT8D02 and NTDK16 Digital Line Cards
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).
In-circuit protection against power line crosses or lightning is not provided on
the Digital line card.
January 2002