Release control, Pad switching – Nortel Networks 1000 User Manual

Page 600

600

NT8D14 Universal Trunk card

Table 218
Environmental specifications (cont’d.)

Parameter

Specifications

Operating humidity

5 to 95% RH (non-condensing)

Storage temperature

- 40 to + 70 degrees C

Release control

Release control establishes which end of a call (near, far, either, joint, or
originating) disconnects the call. Only incoming trunks in idle ground start
configuration can provide disconnect supervision. You configure release
control for each trunk independently in the Route Data Block (LD 16).

PAD switching

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

The insertion loss from IPE ports to IPE ports is as follows:

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008