Nortel Networks Circuit Card 311 User Manual

Page 685

Electrical specifications

685

Table 245
Insertion Loss from IPE Ports to IPE Ports (measured in dB)

The transmission properties of each trunk are characterized by the
class-of-service (COS) you assign in the Trunk Data Block (LD 14).
Transmission properties may be via net loss (VNL) or non via net loss
(non-VNL).

Non-VNL trunks are assigned either a Transmission Compensated (TRC) or
Non-Transmission Compensated (NTC) class-of-service to ensure stability
and minimize echo when connecting to long-haul trunks, such as Tie trunks.
The class-of-service determines the operation of the switchable PADs
contained in each unit. They are assigned as follows:

•

Transmission Compensated

— used for a two-wire non-VNL trunk facility with a loss of greater than

2 dB for which impedance compensation is provided

— or used for a four-wire non-VNL facility

•

Non-Transmission Compensated

— used for a two-wire non-VNL trunk facility with a loss of less than 2 dB

— or used when impedance compensation is not provided

Table 246 "Insertion Loss from IPE Ports to IPE Ports (measured in dB)"
(page 686)

shows PAD settings and the resulting port-to-port loss for

connections between the Universal Trunk Card (UTC) and any other
Intelligent Peripheral Equipment (IPE) or Peripheral Equipment (PE) unit,
denoted as Port B

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008