Pad switching – Nortel Networks 1000 User Manual

Page 714

714

NT8D15 E and M Trunk card

The optional applications, features and signaling arrangements for each
trunk are assigned through unique route and trunk data blocks. Refer to
Features and Services (NN43001-106-B) for information about assigning
features and services to trunks.

PAD switching

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 Transmission Compensated
(TRC) or Non-Transmission Compensated (NTC) class-of-service.

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.

Table 283 "Insertion Loss from IPE Ports to IPE Ports (measured in dB)"
(page 714)

shows the insertion loss from IPE port to IPE port.

Table 283
Insertion Loss from IPE Ports to IPE Ports (measured in dB)

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008