1) Scope
2) References
3) Conventions
4) Changes to ITU-T Rec. G.8031/Y.1342
5) Changes to clause
4, Abbreviations
6) Changes to clause
6, Introduction
7) Changes to clause
7, Requirements
8) Changes to clause
10, Protection architectures
9) Changes to clause 11, APS
Protocol
10) Changes to Annex
A, State
transition tables of protection switching
11) Changes to Appendix
I, Operation
example of 1-phase APS protocol