Latest Releases by ITU-T

ITU update

The ITU-T has just released a new set of documents approved at the last plenary meeting in July. This includes:

  • New revision of G.8261 (first revision in nearly five years), containing a new network limit for chains of enhanced SyncE clocks.

  • New revision of G.8273.2, consolidating the specifications of the new boundary clocks, Class C and Class D.

There were also small amendments to a number of other documents including G.8262.1 (enhanced SyncE clocks), G.8271.1 (network limits for time), G.8272.1 (enhanced PRTC), and the three PTP profiles, G.8265.1, G.8275.1 and G8275.2.

The major new addition is that new network limit for chains of enhanced clocks. This almost completes the set of recommendations on enhanced clocks now, meaning the ITU-T now has a solid, agreed foundation for synchronization of 5G networks. The main active ongoing work in this area is now in the supplying synchronization to fronthaul networks, and looking at relative time specifications for fronthaul.

An interesting part of this is that the ITU-T has begun a new cross-discipline work item for mobile transport networks called This project is being worked on by several separate Questions (a Question is the ITU-T term for a sub-committee, since its terms of reference are defined in terms of questions, such as “What network synchronization characteristics should be recommended for services carried over packet based networks?”). The Questions involved are Q11 (optical interfaces), Q12 (transport network architectures), Q13 (network synchronization) and Q14 (management and control).

The project was proposed by China Mobile, the largest mobile operator in the world, to help define the transport network architecture for their new 5G network. The project is intended to make extensive re-use of other technologies such as FlexE, defined by the Optical Interface Forum (OIF), in order to speed up the development process. It has an aggressive schedule for a standards body which is not known for acting fast, with a schedule to complete the main aspects by September 2020. We should expect to see pre-standard equipment even earlier than that, with many carriers having roll-out plans for their 5G networks starting next year.

Tim Frost
Strategic Technology Manager

Recent Blogs

Related Blogs

banana skin

Will SD-WAN really be the savior?

Mar 13, 2019
The only way to prove it is to get validation on how it will perform against your needs…
1876 Read more
Four Boardroom Members

How to Optimise Your IT Network and Spend

Feb 06, 2019
Network emulation can be a key tool to overcome barriers in getting the most out of your…
2990 Read more

Responding to IT Network Issues

Jan 22, 2019
If simple remedial scripts are not enough to fix an IT network issue, a more…
3946 Read more

Archived Blogs

1082 More

Timing not Telecoms

Nov 08, 2016
712 More

5G Coming Soon

Aug 22, 2016
731 More

What is 1588 PTP?

Aug 04, 2016
872 More

5G on the Horizon

Aug 01, 2016
738 More
752 More

What is a PTP Clock?

Apr 09, 2016
887 More

What is Time Error?

Oct 21, 2015
737 More

LTE-A & VoLTE Rollout

Sep 22, 2015
715 More

LTE Picks Up Speed

Aug 22, 2015
693 More

What is the Time?

Aug 22, 2015
698 More

Mobile and Sync

Aug 22, 2015
684 More

What is SyncE?

Aug 22, 2015
1345 More
780 More

Microwave Update

Aug 22, 2015
772 More

Unravelling Standards

Aug 22, 2015
747 More

Partial Progress?

Aug 22, 2015
700 More

Interpreting ITU

Aug 22, 2015
686 More

Confusion Rules!

Aug 22, 2015
712 More

Basestations Need Sync

Aug 22, 2015
724 More

ITSF 2015 Edinburgh

Aug 22, 2015
684 More

India to Follow China?

Aug 07, 2015
705 More

Click your area of interest below for more tutorials and real-world case studies.