xxii Issue 3 June 2001
Figures
8-8 Example Single-Homed Path-Switched Ring
Configuration Cross-Connections 8-63
8-9 Example Dual-Homed OC-3/OC-1 Path-Switched
Ring Configuration Cross-Connections 8-66
8-10 Locked (0x1) STS-3c - Broadband Services Using
DDM-2000 OC-12 Multiplexer 8-69
9 Maintenance Description
9-1 Three-Tiered Operations 9-3
9-2 Single-Ended Operations 9-5
9-3 Example of Maintenance Signals as a Result of
Unprotected Incoming OC-3 Failure 9-13
9-4 DS1 Maintenance Signaling — Non-Ring
Interfaces 9-15
9-5 DS3 Maintenance Signaling — Non-Ring
Interfaces 9-16
9-6 OC-3 or EC-1 Line Maintenance Signaling —
Non-Ring Interfaces 9-17
9-7 Maintenance Signaling — VT Ring Application 9-18
9-8 Maintenance Signaling — VT Ring Application,
Unequipped 9-19
9-9 Maintenance Signaling — VT Ring Application,
TMUX circuit pack 9-20
9-10 Maintenance Signaling — STS Ring Application 9-21
9-11 Maintenance Signaling STS Ring Application —
Unequipped 9-22
9-12 Unidirectional Line Protection Switching 9-26
9-13 Two-Fiber Unidirectional Ring 9-28
9-14 Path Protection Switching 9-29
9-15 Locked DS3 Cross-Connect Path Protection
Switching 9-31
9-16 DRI Path Protection Switching 9-33
9-17 Local Equipment Test 9-39
9-18 Local Wiring Cross-Connect Test 9-39
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