Name: Lucent Technologies DDM-2000 OC-12
Brand: Lucent Technologies
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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:

■ Inserts and detects STS-1 path AIS

■ Inserts and detects SONET line AIS and inserts and detects line far-end-

receive failure (FERF)

■ Inserts STS-1 path unequipped signal

■ Detects OC-3 line failures (LOS, LOF, AIS, and BER)

■ Detects STS-1 LOP

■ Detects OC-3 line signal degrade BER.

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