363-206-295
Circuit Pack Descriptions
Issue 1
December 1997
7-63
Maintenance Signal Functions
7
The following are the major maintenance signal functions of the 21G/21G-U/
21G2-U OLIU circuit pack:
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Inserts and detects STS-1 path AIS
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Inserts and detects SONET line AIS and inserts and detects line far-end-
receive failure (FERF)
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Inserts STS-1 path unequipped signal
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Detects OC-3 line failures (LOS, LOF, AIS, and BER)
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Detects STS-1 LOP
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Detects OC-3 line signal degrade BER.