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Circuit Pack Descriptions
7-34
Issue 3 June 2000
Loopbacks
7
Two loopbacks are provided on the BBG4/BBG4B DS3. The terminal loopback
bridges the DS3 desynchronizer output signal (transmitted toward the DSX-3)
back into the DS3 synchronizer input. Operation of the loopback does not affect
the signal transmitted to the DSX-3. The facility loopback bridges the STS-1
output signal to the OLIU back toward the DSX-3. Operation of this loopback does
not affect the signal transmitted to the fiber. Both loopbacks are controlled by the
SYSCTL through the intra-shelf control bus.
Performance Monitoring
7
The BBG4/BBG4B DS3 circuit pack provides PM circuitry for the following
performance parameters:
■
STS path parameters derived from B3 coding violations
■
DS3 path parameters derived from P-bit coding violations
■
DS3 path parameters derived from frame and multiframe (F&M) bit errors
■
DS3 line errors based on B3ZS violations (BBG4B only)
■
DS3 P-bit and F&M bit PM for both directions of transmission (BBG4B only)
■
C-bit parity and FEBE performance monitoring for both directions of
transmission (BBG4B only).
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