Committed to connecting the world


Question 13

​​Question 13/15 – Network synchronization and time distribution performance

(Continuation of Question 13/15)

Network synchronization performance specifications are essential for successful operation of digital transmission networks including the support of, for example, mobile networks. Network timing performance standards are necessary to define the feasibility and most effective means of implementing a time reference distribution service. This includes the distribution of both precision time and frequency.
Continuing effort needs to be put into the study of synchronization issues in packet based networks. 

Requirements for the related OAM and Management functions need to be studied. 

Requirements from new network architectures and applications should be considered (e.g. as related to the IoT, IMT2020 (5G), etc.).
Robust and reliable network synchronization solutions (e.g. as related to GNSS (Global Navigation Satellite System) backup) need to be addressed.

SDN/NFV implications on the synchronization networks should also be studied.

New transmission technologies, services and facilities are regularly being introduced. Inter-operator links need to be efficiently installed, commissioned, brought into service and maintained. Test and measurement instrumentation is required for the installation, commissioning, bringing into service and maintenance of telecommunications equipment and networks. The measurement of the same parameter made with different measuring instruments should give reliable, repeatable and comparable results. Test equipment specification needs continuous review to take account of technology changes and improvements of jitter, wander and precision time measurement.

The following major Recommendations, in force at the time of approval of this Question, fall under its responsibility:
Study items to be considered include, but are not limited to:
The following are examples of instrumentation and techniques which may be studied:
Tasks include, but are not limited to:


Study Groups:
Standardization bodies, forums and consortia: