363-206-285
Circuit Pack Descriptions
Issue 3 June 2001
7-117
Control Functions 7
The following are the major control functions of the 22D-U OLIU circuit pack:
■ Switches protection for the optical line and DS3, MXRVO, STS1E, and TG
circuit packs
■ Processes transport overhead
■ Stores inventory information (
CLEI
code, date of manufacture, etc.)
■ Supports VT and STS signal degrade path 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 following are the major maintenance signal functions of the 22D-U OLIU
circuit pack:
■ Inserts and detects STS-1 path AIS or inserts and detects VT1.5 path AIS
■ Inserts and detects SONET line AIS and inserts and detects line FERF
■ Inserts and detects STS-1 path unequipped signal
■ Inserts and detects VT path unequipped signal
■ Inserts and detects STS-1 path yellow, if VT1.5 cross-connected
■ Detects IS-3 line failures (LOS, LOF, AIS, and BER)
■ Detects IS-3 line signal degrade BER.
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