scope:

This third part of ETS 300 462 outlines requirements for the control of jitter and wander within synchronization Networks that are constructed according to the architectural principles described in ETS 300 462-2 [2]. A synchronization network that complies with the network limits for jitter and wander specified in this ETS will be suitable for the synchronization of Synchronous Digital Hierarchy (SDH) and Public Switched Telephone Network (PSTN) networks. It combines the short term stability requirements of SDH networks with the long term stability requirements of the PSTN. The values specified in this ETS refer to the design of new synchronization networks. They do not necessarily represent the performance of existing PSTN synchronization networks.

The network limits specified in this ETS form the network requirements from which the clock specifications in ETS 300 462-4 [3], ETS 300 462-5 [4] and ETS 300 462-6 [5] have been derived.