Amendment 1 to Recommendation ITU-T G.8262/Y.1362 (2010) adds a new Appendix IV, "Considerations related to synchronous Ethernet over 1000BASE-T and 10GBASE-T".
ITU-T Y.1362 AMD 1-2012 history
2012ITU-T Y.1362 AMD 1-2012 Timing characteristics of a synchronous Ethernet equipment slave clock Amendment 1 (Study Group 15)