scope:

This ETS specifies the full mechanical and electrical characteristics, the necessary functional characteristics and the corresponding conformance tests for a terminal equipment interface for: a) connection to the network termination points of 139 264 kbit/s digital unstructured leased lines (D140U); and b) connection to the network termination points of 139 264 kbit/s digital structured leased lines (D140S) which support an unstructured 138 240 kbit/s information transfer rate. These leased lines are defined in ETS 300 686 and ETS 300 688.