1 Scope
2 References
3 Definitions
4 Abbreviations and acronyms
5 Protection characteristics
5.1 Monitoring methods and conditions
6 Protection group commands
6.1 End-to-end commands and states
6.2 Local commands
7 Protection architectures
7.1 Unidirectional and bidirectional switching
7.2 Need for an APS/PCC channel
7.3 Revertive and non-revertive switching
7.4 Provisioning mismatches
7.5 Overview of protection architectures for OTN linear protection
8 APS protocol
8.1 APS channel format
8.2 Transmission and acceptance of APS protocol
8.3 Request type
8.4 Protection types
8.5 Requested signal
8.6 Bridged signal
8.7 Control of bridge
8.8 Control of selector
8.9 Signal Fail of the protection entity
8.10 Equal priority requests
8.11 Command acceptance and retention
8.12 Hold-off timer
8.13 Exercise operation
8.14 APS channel alarming
Appendix I – Examples of operation
I.1 1+1 unidirectional switching
I.2 1+1 bidirectional switching
I.3 1:n bidirectional switching
I.4 Exercise command operation
Appendix II – ODUk client protection
II.1 Overview over protection architectures of OTN linear
client protection
II.3 Model of client SNC/Nc protection architecture of OTN linear
client protection
II.3 Model of client SNC/I protection architectures of OTN linear
client protection