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����