Nortel Networks Circuit Card 311 - Manual (Page 147)

Application 147
Before the appropriate balance network can be selected, the loop length
between the near-end (Meridian 1) and the far-end station must be known.
To assist in determining loop length,
Table 63 "OPS analog line card - cable
loop resistance and loss" (page 134) shows some typical resistance and
loss values for the most common cable lengths for comparison with values
obtained from actual measurements.
Set the jumpers on the NT1R20 OPS card.
Each line interface unit on the card has two jumper blocks that are used to
select the proper loop current, depending on loop length. See
Figure 90
"NTCK46AA/AB/AC/AD" (page 337) .
For units connected to loops of 460 to 2300 ohms, both jumper straps
must be installed. For loops that are 460 ohms or less, jumper straps are
not installed.
Insert the OPS card in its assigned slot. Cross-connect off-premise
telephones.
Application
Off-premise station application
The NT1R20 OPS analog line card is designed primarily to provide an
interface for off-premise station lines. An OPS line serves a terminal –
usually a telephone – remote from the PBX either within the same serving
area as the local office, or through a distant office. The line is not switched
at these offices; however, depending on the facilities used, the local office
serving the OPS station can provide line functions such as battery and
ringing. Facilities are generally provided by the local exchange carrier
(usually, OPS pairs are in the same cable as the PBX-CO trunks). The
traditional OPS scenario configuration is shown in
Figure 25 "Traditional
OPS application configuration" (page 149) .
Note: Do not confuse OPS service with Off-Premise Extension (OPX)
service. OPX service is the provision of an extension to a main
subscriber loop bridged onto the loop at the serving CO or PBX. Do not
confuse CLS OPS (assigned in the Analog (500/2500-type) Telephone
Administration program LD 10) with OPX, which denotes Off-Premise
Extension service.
The NT1R20 OPS Analog Line Card is designed primarily to provide an
interface for Meridian 1 off-premise station lines. An OPS line serves a
terminal – usually a telephone – remote from the PBX either within the
same serving area as the local office or through a distant office. The line
is not switched at these offices; however, depending on the facilities used,
the local office serving the OPS station may provide line functions such as
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.