TA NWT 000782 : ISSUE 2

Bellcore's view of generic criteria for an OC N interface to a digital LATA Switching System (LSS) to be used in the trunk networks of the BCCs. The functions of the typical SONET digital switch interface will be described as pertaining to the intra office environment. The intra office environment is viewed as a central office where many SONET NEs are co located as inter connected via SONET signals. As an option, the interoffice case is also considered. Special attention is focused on the overhead that needs to be processed on the received signal. the SONET digital switch interface will terminate an OC N signal that transports byte synchronous floating VT 1.5s. This mode allows direct identification and access to the 24 DS0 channel per VT 1.5 without framing on the DS1 signal.