Nortel Networks Circuit Card 311 - 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
Copyright © 2003-2008, Nortel Networks
.