Nortel Networks 1000 User Manual

Page 601

Electrical specifications

601

Table 219
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 220 "Insertion Loss from IPE Ports to IPE Ports (measured in
dB)" (page 602)

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

02.06

Standard

27 August 2008