1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Individual and group protection concept
6.1 Individual protection
6.2 Group protection
7 Architecture and traffic types
7.1 Protection classes
7.2 Traffic types
7.3 Architecture types
8 Switching types
9 Operation types
10 Switching protocol and ring topology information
11 Functional models for ring protection
11.1 Functional models for SLRing
11.2 Functional models for DLRing
12 Multi-ring scenario
13 Protection switching performance
14 Hold-off timer
15 Wait-to-restore timer
16 Automatic protection switching (APS) signal
17 Blank clause
18 External commands
19 Automatic commands
20 Priority
21 SF and SD trigger conditions
22 Mechanisms to prevent misconnections
22.1 Circuit-switched technologies
22.2 Packet switched technologies