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ITU-T G.8275.2 (PTP Profile - PTS) One-Page Summary

ITU-T G.8275.2 (PTP Profile - PTS) One-Page Summary

Sept 10, 2025

Title: PTP telecom profile for phase/time synchronization with partial timing support from the network

Summary

  • Defines the profile (options, parameters, extensions) for the use of PTP for packet-based
    time/phase delivery over existing networks

  • Operates using unicast delivery over IPv4 or IPv6 networks

  • Main use-case is time synchronization of TDD-based cellular basestations

Status

  • Current version: 3.2 Edition, August 2024, Amendment 2 to 2022 Revision

  • Download from: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=12833

Key Contents

Profile Features:

  • Unicast Messaging - easier to support and manage in telecoms networks

  • Message rates up to 128 messages per second (typical rates 16 to 32)

  • Operates over IPv4/UDP for universal applicability (IPv6 also permitted)

  • Operates over existing telecoms networks, with no PTP “on-path” support required

  • Planned protection schemes in accordance with existing telecom practice

  • Re-uses the alternate BMCA and clock class assignments from G.8275.1

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