Tab le of Conten ts
Issue 8.0 July 2002 9-i
9
Maintenance Description
Overview 9-1
Remote Maintenance Philosophy 9-1
Maintenance Signals 9-2
Fault Detection, Isolation, and Reporting 9-8
Protection Switching 9-31
â– High-Speed Protection 9-31
General 9-31
2-Fiber Ring Protection Switching Architecture 9-32
2-Fiber Ring Protection Switching Example 9-35
Single and Double Failure States 9-40
â– Electrical Low Speed Protection 9-43
■Optical Low Speed Protection — (OC-3) 9-47
General 9-47
Optical Low Speed Protection Switching Architecture 9-49
Optical Low Speed Protection Switching Example 9-50
■Optical Low Speed Protection — (OC-12) 9-52
General 9-52
Optical Low Speed Protection Switching Architecture 9-54
Optical Low Speed Protection Switching Example 9-55
â– Dual Ring Interworking Protection 9-57
â– Synchronization Protection 9-65
General 9-65
Synchronization Hardware Protection 9-65
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