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Circuit Pack Descriptions
Issue 3 June 2001
7-125
■ Processes the received clock and provides a reference clock to the TG
circuit packs
■ Provides express processing for VT AIS.
Control Functions 7
The major control functions are as follows:
■ Switches protection for OC-3 line and DS3, MXRVO, STS1E, other OLIU,
and TG circuit packs
■ Processes transport and path overhead
■ Stores inventory information (
CLEI
code, date of manufacture, etc.)
■ Supports VT and STS signal degrade protection switching
■ Supports STS-1 BER signal fail (10
-3
or 10
-6
) path protection switching
■ Supports path protection switching based on STS-1 unequipped, STS-1
AIS, STS-1 LOP, VT AIS, VT unequipped, and VT LOP.
Maintenance Signal Functions 7
The major maintenance signal functions are as follows:
■ Inserts and detects STS-1 path AIS or inserts and detects VT1.5 path AIS
■ Inserts and detects OC-3 line AIS
■ Inserts and detects STS-1 path unequipped signal
■ Inserts and detects VT path unequipped signal
■ Inserts and detects line FERF
■ Inserts and detects STS-1 path yellow, if VT1.5 cross-connected
■ Detects OC-3 line failures (LOS, LOF, AIS, and BER)
■ Detects OC-3 line signal degrade BER.
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