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ITU-T G.8271 (General) One-Page Summary

ITU-T G.8271 (General) One-Page Summary

Owned by Gordon Muir (Deactivated)
Last updated: Feb 24, 2023 by Stefano Ruffini

Title: Time and phase and synchronization aspects in packet networks

Summary

  • General aspects and concepts for time distribution

  • Requirement categories (based on external standards, e.g. 3GPP)

  • Defines timing interfaces (e.g. 1pps) and associated serial time-of-day messages

Status

Key Contents

Accuracy Classes:

Level of Accuracy

Time error requirements

Typical applications

1

500ms

Billing, alarms

2

100µs

IP Delay monitoring

3

5µs

LTE TDD (≥ 3km cell)

4

1.5µs

UTRA-TDD, LTE-TDD, NR TDD

Synchronous Dual Connectivity

NR Carrier Aggregation

5

1µs

WiMAX-TDD (some configurations)

6

<500ns

Various radio co-ordination techniques

Network Reference Model:

Serial Time-of-Day Messages:

Message types:

  • Time event message
  • Time announce message
  • GNSS status message


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