Computer Hardware Installation Guide

Electrical specifications 137
Power requirements
Table 65 "OPS analog line card - power requirements" (page 137) shows
the maximum power consumed by the card from each system power supply.
Table 65
OPS analog line card - power requirements
Voltage Tolerance
Current (max.)
±15.0 V dc
±5%
150 mA
+8.5 V dc
±2%
200 mA
+5.0 V dc
±5%
100 mA
–48.0 V dc
±5%
350 mA
The +8.5 V dc input is regulated down to +5 V dc for use by the digital logic
circuits. All other power to the card is used by the line interface circuits.
The +8.5 V dc input is regulated down to + 5 V dc for use by the digital logic
circuits. All other power to the card is used by the line interface circuits.
The +8.5 V dc input is regulated down to +5 V dc for use by the digital logic
circuits. All other power to the card is used by the line interface circuits. The
±15.0 V dc inputs to the card are used to power the analog circuits. The +5
V dc from the module power supply is used for the analog hybrid. The
–48.0 V dc input is for the telephone battery. Ringing power for telephones
is 86 Vrms ac at 20 Hz on –48 V dc. The Rsync signal is used to switch
the 20 Hz ringing on and off at the zero cross-over point to lengthen the
life of the switching circuits.
Foreign and surge voltage protection
The NT1R20 OPS analog line card meets UL-1489 and CS03 over-voltage
(power cross) specifications and FCC Part 68 requirements for hazardous
and surge voltage limits.Table 65 "OPS analog line card - power
requirements" (page 137) shows the maximum power consumed by the
card from each system power supply.
Ringer limitations
The OPS line card supports up to three NE-C4A (3 REN) r ingers on each
line for either ONS or OPS applications. See Table 66 "OPS analog line
card - ringer limitations" (page 138).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.