scope:

The present document specifies the relevant parameters and their limiting values that are able to satisfactorily control the amount of jitter and wander present at synchronous digital hierarchy (SDH) and plesiochronous digital hierarchy (PDH) network-network interfaces (NNI). The present document also provides the minimum jitter and wander requirements at SDH and PDH user-network interfaces (UNI). However, particular terminals or services may have additional jitter and wander requirements and in those cases the relevant standards apply.