SSH EN 300 686 V1.2.1:2001

Access and Terminals (AT); 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U, D140S); Network interface presentation

Scope

The present document specifies the technical requirements and conformance tests for the network interface
presentations of 34 Mbit/s and 140 Mbit/s digital leased lines. This includes:
- the 34 Mbit/s Digital Unstructured leased line operating at 34 368 kbit/s;
- the 140 Mbit/s Digital Unstructured leased line operating at 139 264 kbit/s;
- the 34 Mbit/s digital structured leased line operating at 34 368 kbit/s for the support of an unstructured
33 920 kbit/s information transfer rate;
- the 140 Mbit/s digital structured leased line operating at 139 264 kbit/s for the support of an unstructured
138 240 kbit/s information transfer rate.
A connection is presented via interfaces at Network Termination Points (NTPs). The present document defines the
network interface as presented by the leased line provider and should be used in conjunction with the appropriate
companion standard, EN 300 687 [6] (34 Mbit/s) or EN 300 688 [7] (140 Mbit/s), which specifies the connection
characteristics between NTPs of the leased line. The present document and the appropriate connection characteristics
standard together describe the technical characteristics of the relevant leased line.
The present document is applicable to leased lines, including part time leased lines, whose establishment or release does
not require any protocol exchange or other intervention at the NTP.
The present document covers the mechanical and electrical characteristics (except safety, overvoltage and EMC
aspects) of the network interface and specifies the conformance tests for equipment of the kind that provides the
interface presentation. Some of the tests described in the present document are not designed to be applied to the
interface of an installed leased line; such tests may be applied to equipment of the kind used to provide the interface.
The present document does not include details concerning the implementation of the tests nor does it include
information on any regulations concerning testing. There is no requirement for each leased line to be tested in
accordance with the present document before it is brought into service or returned into service following repair.