Recommendation ITU-T G.8272.2 specifies requirements for coherent network primary reference time clocks (cnPRTCs) suitable for time, phase and frequency synchronization in networks. These requirements apply under normal environmental conditions specified for the equipment. This amendment provides the following update: Edits to clause 6.1 including reference to [ITU-T G.8272] Appendix V Considerations on the use of GNSS for the PRTC.