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Cisco ONS 15310-CL and Cisco ONS 15310-MA Troubleshooting Guide, R7.0
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Chapter 1 Alarm Troubleshooting
1.10.4 Generic Signal and Circuit Procedures
Note
If ports managed into IS administrative state are not receiving signals, the LOS alarm is either
raised or remains, and the port service state transitions to OOS-AU,FLT.