scope:

This second edition European Telecommunication Standard (ETS) specifies generic frame structures for the transport of various signals at the ITU-T Recommendation G.702 [1] hierarchical rates of 2048 kbit/s, 34368 kbit/s and 139264 kbit/s. The support of Asynchronous Transfer Mode (ATM) cells and Synchronous Digital Hierarchy (SDH) Tributary Units (TUs) in the Plesiochronous Digital Hierarchy (PDH) bit rates is covered in this ETS. Functions specific to the support of ATM cells performed in the transmitter and receiver are not part of this interface standard but are given for info in annex A.