Name: Lucent Technologies DDM-2000 OC-3
Brand: Lucent Technologies
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Tab le of Con tents

Issue 3 June 2001 9-i

Maintenance Description

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

Status of ACTIVE LED on OLIUs 9-24

APS Initiation Criteria 9-25

■ Path Protection Switching (Path Switched Rings) 9-27

Path Protection Scheme 9-29

Path Protection - Locked DS3 Cross-Connect 9-31

■ Dual Ring Interworking (DRI) 9-32

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