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Chapter 12 — NTMW44 Universal Trunk Card
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 48
shows PAD settings and the resulting port-to-port loss for trunk
connections between the NTMW44 and any other Peripheral Equipment (PE)
unit, denoted as Port B
In Meridian 1 Option 11C Compact systems, the insertion loss from PE ports
to PE ports is as follows.
Meridian 1 Option 11C Compact
Page 121 of 136
Technical Reference Guide
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