Issue 3 June 2001 xi
Contents
9 Maintenance Description 9-1
■ Overview 9-1
Three-Tiered Operations 9-1
■ Single-Ended Maintenance Philosophy 9-4
Multi-Vendor OI 9-6
SEO Network Element Status Using Alarm
Gateway NE 9-7
■ In-Service Upgrades 9-9
Software Upgrades 9-9
■ Software Compatibility 9-10
■ Maintenance Signaling 9-12
Non-Ring Interfaces 9-14
Ring Applications 9-18
■ Fault Detection, Isolation, and Reporting 9-23
Detection 9-23
Isolation 9-23
Reporting 9-23
■ Protection Switching 9-24
Automatic Line Protection 9-24
Path Protection Switching (Path Switched Rings) 9-27
Dual Ring Interworking (DRI) 9-32
OC-3/OC-12 Path Switched Ring (0x1) 9-34
OC-3/OC-1PathSwitchedRing(0x1) 9-34
Status of ACTIVE LED on Rings 9-34
Equipment Protection 9-34
Synchronization Reference Protection 9-35
■ Loopbacks 9-36
■ Tests 9-37
Transmission Tests 9-37
Automatic Turnup Tests 9-37
Operations Interface Tests 9-39
■ Performance Monitoring (PM) 9-40
VT Performance Monitoring 9-42
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