tworks with full timing support from the network." ITU-T Recommendation, Amendment 1, 2020. https://handle.itu.int/11.1002/1000/14527 "G.8271.2: Network limits for time synchronization in packet networks with partial timing support from the network." ITU-T Recommendation, Amendment 2, 2018. https://handle.itu.int/11.1002/1000/13768 "G.8272: Timing characteristics of primary reference time clocks." ITU-T Recommendation, Amendment 1, 2020. https://handle.itu.int/11.1002/1000/14211 "G.8272.1: Timing characteristics of enhanced primary reference time clocks." ITU-T Recommendation, Amendment 2, 2019. https://handle.itu.int/11.1002/1000/14014 "G.8273: Framework of phase and time clocks." ITU-T Recommendation, Corrigendum 1, 2020. https://handle.itu.int/11.1002/1000/14528 "G.8273.2: Timing characteristics of telecom boundary clocks and telecom time slave clocks for use with full timing support network." ITU-T Recommendation, 2020. https://handle.itu.int/11.1002/1000/14507 "G.8273.3: Timing characteristics of telecom transparent clocks for use with full timing support from the net- work." ITU-T Recommendation, 2020. https://handle.itu.int/11.1002/1000/14508 "G.8273.4: Timing characteristics of telecom boundary clocks and telecom time slave clocks for use with par- tial timing support from the network." ITU-T Recommendation, 2020. https://handle.itu.int/11.1002/1000/14214 "G.8275: Architecture and requirements for packet-based time and phase distribution." ITU-T Recommenda- tion, 2020. https://handle.itu.int/11.1002/1000/14509 "G.8275.1: Precision time protocol telecom profile for phase/time synchronization with full timing support network." ITU-T Recommendation, Amendment 2020. https://handle.itu.int/11.1002/1000/14543 "G.8275.2: Precision time protocol telecom profile for time/phase synchronization with partial timing support network." ITU-T Recommendation, Amendment 2020. https://handle.itu.int/11.1002/1000/14544 "GSTR-GNSS: Considerations on the Use of GNSS as a Primary Time Reference in Telecommunications." ITU-T Tec