NT8D14Universal Trunk Card Page383 of 544
Option11C and 11C Mini TechnicalReference Guide
Environmental specifications
Table116 lists the environmental specifications for the Universal Trunk
Card.
Foreign and surge voltage protection
The Universal Trunk Card meets CS03 overvoltage (power cross)
specifications.
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
Table 1 16
Environmental specifications
Parameter Specifications
Operating temperature 0 to 50 degrees C, ambient
Operating humidity 5 to 95% RH (non-condensing)
Storage temperature - 40 to + 70 degrees C