xii Issue 1 December 1997
Contents
5 Transmission and Synchronization Interfaces
â– Overview 5-1
â– Transmission Interfaces 5-1
OC-12 STS-1 Path Switched Ring 5-2
Dual Ring Interworking (DRI) 5-4
OC-3/OC-12 Ring (0x1) Low-Speed Interfaces 5-4
Linear (1+1) Optical Extension Between OC-12
and OC-3 5-8
â– Synchronization Interfaces 5-10
Free-Running 5-10
Line Timing 5-10
DS1 External 5-10
Holdover 5-11
DS1 Output Modes: MULT and SYNC OUT 5-11
DS1 Output Mode, MULT 5-11
DS1 Output Mode, SYNC OUT 5-12
Synchronization Messaging 5-16
Applications 5-16
DS1 Timing Output Integrity 5-17
Automatic Synchronization Reconfiguration 5-19
Synchronization Provisioning Integrity 5-21
Feature Details and Options 5-21
Examples 5-24
Synchronization Reconfiguration Using an
Externally Timed Access Ring 5-24
Synchronization Reconfiguration in an
Access Ring 5-27
Network Timing Distribution 5-30
Interoffice Timing Distribution 5-30
Access Network Timing Distribution 5-32
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