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ITU-T G.8275.2 One-Page Summary

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Created by Gordon Muir on Feb 22, 2019

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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: 1st. Edition, June 2016, plus Amd. 1, August 2017 and Amd. 2, March 2018
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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