Mde-2020.htm International Telecommunication Union Telecommunication Standardization Sector (ITU-T) "G.8273.2: Timing characteristics of telecom boundary clocks and telecom time slave clocks." ITU-T Re- commendation, 2020. https://handle.itu.int/11.1002/1000/14507 "Q13/15 - Network synchronization and time distribution performance." ITU-T Study Groups, Study Period 2017-2020. hhttps://www.itu.int/en/ITU-T/studygroups/2017-2020/15/Pages/q13.aspx Internet Engineering Task Force (IETF) Arnold, D., and H. Gerstung. "Enterprise Profile for the Precision Time Protocol with Mixed Multicast and Unicast Messages." IETF, draft-ietf-tictoc-ptp-enterprise-profile-18, 2020. https://tools.ietf.org/html/draft-ietf-tictoc-ptp-enterprise-profile-18 Mills, D. "Network Time Protocol (NTP)." IETF, RFC 958, 1985. https://tools.ietf.org/html/rfc958 Mills, D. "Network Time Protocol Version 3: Specification, Implementation and Analysis." IETF, RFC 1305, 1992. https://tools.ietf.org/html/rfc1305 Mills, D. "Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI." IETF, RFC 4330, 2006. https://tools.ietf.org/html/rfc4330 Mills, D., J. Martin, J. Burbank, and W. Kasch. "Network Time Protocol Version 4: Protocol and Algorithms Specification." IETF, RFC 5905, 2010. https://tools.ietf.org/html/rfc5905 Perrig, A., D. Song, R. Canetti, J. Tyger, and B. Briscoe. "Timed Efficient Stream Loss-Tolerant Authentica- tion (TESLA): Multicast Source Authentication Transform Introduction." IETF, RFC 4082, 2005. https://tools.ietf.org/html/rfc4082 Weis, B., C. Rowles, and T. Hardjono. "The Group Domain of Interpretation." IETF, RFC 6407, 2011. https://tools.ietf.org/html/rfc6407 "Amendment to MEF 22.3: Transport Services for Mobile Networks." MEF Amendment, 22.3.1, 2020. https://www.mef.net/wp-content/uploads/2020/04/MEF-22-3-1.pd: "Transport Services for Mobile Networks." MEF Implementation Agreement, 22.3, 2018. https://www.mef.net/wp-content/uploads/2018/01/MEF-22-3.pdf Mills, D. Computer Network Time Synchronization: The Network Time Prot