Power Requirements - Nortel Circuit Card Installation Manual

Power requirements

Table 65 shows the maximum power consumed by the card from each system
power supply.
Table 65
OPS analog line card – power requirements
±15.0 V dc
+8.5 V dc
+5.0 V dc
–48.0 V dc
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.
Ringer limitations
The OPS line card supports up to three NE-C4A (3 REN) ringers on each line
for either ONS or OPS applications. See Table 66.
Table 66
OPS analog line card – ringer limitations (Part 1 of 2)
ONS Loop Range
0–10 ohms
> 10–460 ohms
NT1R20 Off-Premise Station Analog Line card
Voltage Tolerance
± 5%
± 2%
± 5%
± 5%
Maximum Number of
Ringers (REN)
3
2
Circuit Card Description and Installation
Page 167 of 906
Current (max.)
150 mA
200 mA
100 mA
350 mA