xxii
Issue 1
December 1997
Contents
9
Maintenance Description
■
Overview
Three-Tiered Operations
■
Single-Ended Maintenance Philosophy
Multi-Vendor OI
■
In-service (IS) Upgrades
Software Upgrades
■
DDM-2000 OC-3 and OC-12 Software Compatibility
■
Maintenance Signaling
■
Fault Detection, Isolation, and Reporting
Detection
Isolation
Reporting
■
Protection Switching
Automatic Line Protection
Status of ACTIVE LED on OLIUs
APS Initiation Criteria
Equipment Protection
Synchronization Reference Protection
Path Protection Switching (Path Switched Rings)
Path Protection Scheme
Dual Ring Interworking (DRI) Path Protection
Scheme
OC-3/OC-12 Path Switched Ring (0x1)
Status of ACTIVE LED on Rings
■
Loopbacks
■
Tests
Transmission Tests
Operations Interface Tests
■
Performance Monitoring (PM)
DS3 Performance Monitoring (PM)
DS3 Path PM
P-Bit