Summary

Amendment 1 to Recommendation ITU-T G.987.1 (2010) includes:

1)��������� text describing the operation of XG-PON with IEEE 1588;

2)��������� use cases for XG-PON frequency and time-of-day synchronization;

3)��������� transport of ESMC messages over PON; and

4)��������� clarification of the reference optical configuration for XG-PON coexistence through splitters.