Nortel Networks Circuit Card 311 - Manual (Page 797)

Applications 797
The TRC and NTC COS options determine the operation of the switchable
pads contained in the trunk circuits. They are assigned as follows:
• TRC for a two-wire non-VNL trunk facility with a loss of greater than 2
dB or for which impedance compensation is provided, or for a four-wire
non-VNL facility.
• NTC for a two-wire non-VNL trunk facility with a loss of less than 2 dB or
when impedance compensation is not provided.
In Option 11C systems, Table 310 "Insertion Loss from IPE Ports to IPE
Ports (measured in dB)" (page 797) shows the insertion loss from IPE port
to IPE port.
Table 310
Insertion Loss from IPE Ports to IPE Ports (measured in dB)
Paging trunk operation
When used in the paging mode, a trunk is connected to a customer-provided
paging amplifier system (not zone selectable). When the trunk is accessed
by dial-up or attendant-key operation, it provides a loop closure across
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.