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Circuit Pack Descriptions
7-96 Issue 3 June 2001
Loopbacks 7
Four loopback types are provided on the BBG20 TMUX. Both DS1 and DS3
terminal and facility loopbacks are provided on this pack. For DS1 loopbacks, all
28 are individually addressable. All loopbacks are controlled by the SYSCTL
through the intra-shelf control bus.
Performance Monitoring 7
The BBG20 TMUX circuit pack provides PM circuitry for the following
performance parameters:
■ STS path parameters derived from B3 coding violations
■ VT path parameters derived from V5 coding violations
■ DS3 path parameters derived from P-bit, F&M-bit, or C-bit coding violations
■ DS3 line errors based on B3ZS violations
■ DS1 path parameters derived from near-end SF or ESF framed signals and
far-end ESF framed signals.
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