Nortel Networks Circuit Card 311 - Manual (Page 138)

138 NT1R20 Off-Premise Station Analog Line card
Table 66
OPS analog line card - ringer limitations
ONS Loop Range
Maximum Number of
Ringers (REN)
0–10 ohms 3
> 10–460 ohms 2
0 – 10 ohms 3
> 10 – 900 ohms 2
> 900 – 2300 ohms 1
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 "OPS analog line
card - ringer limitations" (page 138) .
Environmental specifications
Table 67 "OPS analog line card - environmental specifications" (page
138)
shows the environmental specifications of the OPS analog line
card. Table 67 "OPS analog line card - environmental specifications" (page
138) shows the environmental specifications of the card.
Table 67
OPS analog line card - environmental specifications
Parameter Specifications
Operating temperature 0

to +60

C (+32 to +140

F), ambient
Operating humidity 5 to 95% RH (non-condensing)
Storage temperature –40

to +70

C (–40

to +158

F)
Operation
The applications, features, and signaling arrangements for each unit on the
NT1R20 OPS analog line card are assigned through LD 10 and/or jumper
strap settings on the card.
The operation of each unit is configured in software and implemented in the
card through software download messages. When the NT1R20 OPS analog
line card unit is idle, it provides a ground on the tip lead and –48 V dc on
the ring lead. The on-hook telephone presents a high impedance toward
the line interface unit on the card.
The applications, features, and signaling arrangements for each unit on
the OPS analog line card are assigned through the Single-line Telephone
Administration program (LD10) and/or jumper strap settings on the card.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.