scope:

This final draft ETS specifies the technical requirements and conformance tests for connection characteristics of point-to-point 140 Mbit/s digital leased lines. These leased lines operate at:

- 139 264 kbit/s providing an information transmission capability, without restriction on binary content, (D140U); and

- 139 264 kbit/s providing an information transmission capability, without restriction on binary content, of 138 240 kbit/s, (D140S); the remaining 1 024 kbit/s provides an 8 kHz framing structure in accordance with ETS 300 337 (ITU-T Recommendation G.832).

A connection is presented via interfaces at Network Termination Points (NTPs) and includes any equipment that may provide the NTP. Signals between NTPs are subject to impairments during their transfer over the connection. The limits to these impairments are stated in this ETS. This ETS, together with the companion standard ETS 300 686, defining the network interface presentation, describes the technical characteristics of the leased line.

The tests specified in this ETS cannot be carried out by the leased line provider while the leased line is in service, i.e. carrying users' traffic. Thus the tests are designed for bringing into and returning into service, although there is no obligation to perform these tests each time a leased line is brought into or returned into service. However, if the connection is structured, the error performance may be monitored by the leased line provider while the line is in service.

This ETS is applicable for leased lines, including part time leased lines, for which the establishment or release does not require any protocol exchange or other intervention at the NTP.

This ETS specifies the conformance tests for the connection requirements. This ETS does not include details concerning the implementation of the tests, nor does it include information on any relevant regulations.