796 NT8D15 E and M Trunkcard
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 facilitywith 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-wirenon-VNL trunk facility with a loss ofless than 2 dB or
when impedance compensation is not provided.
Table309 "Insertion Loss from IPE Ports to IPE Ports (measured in dB)"
(page 796) shows the insertion loss from IPE port to IPE port.
Table309
Insertion Loss from IPE Ports to IPE Ports(measured in dB)
The transmission properties of each trunk are characterized by
class-of-service (COS) assignments in the trunk data block (LD 14). The
assignment may be non-Via Net Loss (non-VNL) or via Net Loss (VNL). To
ensure stability and minimize echo when connecting to long-haul VNL (Tie)
trunks, non-VNL trunks are assigned either TransmissionCompensated
(TRC) or Non-TransmissionCompensated (NTC) class-of-service.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.