Recommendation ITU-T G.8262/Y.1362 outlines requirements for timing devices used in synchronizing network equipment that uses the physical layer to deliver frequency synchronization. This Recommendation defines the requirements for clocks, e.g., bandwidth, frequency accuracy, holdover and noise generation. Amendment 1 to Recommendation ITU-T G.8262/Y.1362 provides the following updates: -Updates References -Adds a note in clause 9.2.1 -Changes Figure 13 in Clause 11.2.1 -Adds PAM4 interfaces in Appendix III -Adds a sentence in Appendix VII.