Amendment 1 to Recommendation ITU-T G.8271 (2016) provides the following updates: -Updated Title and Scope -Updated Conventions clause -Updated Table 1 and addition of Table 2, describing applications for high-accuracy time synchronization -Revised notes in clause 7 and 7.1 -Revised clause 8, updating reference point descriptions -Correction to the definition of the FCS field in the serial communication channel -Replacement of Table A.7 with a new version and associated notes -Revision to Tables II.1 and II.2 of Appendix II -Correction to Appendix V