Issue 8.0 June 2002 xxv
Figures
8-25 Example of STS-3 Cross-Connections in a 2-Fiber
Bidirectional Ring 8-78
8-26 Example of Limited STS-1 Cross-Connections in a 2-Fiber
Bidirectional Ring 8-81
8-27 Example of OC-3 DCC Connectivity 8-86
8-28 Example of OC-12 DCC Connectivity 8-91
9 Maintenance Description
9-1 FT-2000 OC-48 Add/Drop-Rings Terminal Maintenance
Signals (When Interfacing with DS3 Signals) 9-4
9-2 FT-2000 OC-48 Add/Drop-Rings Terminal Maintenance
Signals (When Interfacing With EC-1, OC-3, IS-3 and
OC-12 Signals) 9-5
9-3 FT-2000 OC-48 Add/Drop-Rings Terminal Maintenance
Signals for Through Tributaries 9-6
9-4 FT-2000 OC-48 Repeater Bay Maintenance Signals 9-7
9-5 2-Fiber Ring Protection Switching Architecture (FT-2000
OC-48 Add/Drop-Rings Terminal) 9-33
9-6 Bidirectional Line-Switched 2-Fiber Ring (Normal
Transmission) 9-35
9-7 Bidirectional Line-Switched 2-Fiber Ring (Single Failure) 9-36
9-8 Bidirectional Line-Switched 2-Fiber Ring (Multiple Failures) 9-39
9-9 Single and Double Failure States 9-41
9-10 Single and Double Failures 9-43
9-11 Electrical Low Speed Protection Switching 9-45
9-12 Optical Low Speed Protection Switching 9-49
9-13 1+1 OC-3 Line (Normal Transmission) 9-50
9-14 1+1 OC-3 Line (Fiber Cut) 9-51
9-15 Optical Low Speed Protection Switching 9-54
9-16 1+1 OC-12 Line (Normal Transmission) 9-55
9-17 1+1 OC-12 Line (Fiber Cut) 9-56
9-18 Dual Ring Interworking Circuit (Normal Transmission) 9-59
9-19 Dual Ring Interworking Circuit (Node Failure in Other Ring) 9-61
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