The present document specifies the technical requirements and test principles for the connection characteristics and the
physical and electrical characteristics (except safety, overvoltage and EMC aspects) of the network interface
presentation of ordinary quality, voice bandwidth, 2-wire, analogue leased lines, provided as part of the minimum set
under the Council Directive on the application of Open Network Provision (ONP) to leased lines (92/44/EEC) (see
annex E).
A connection is presented via interfaces at Network Termination Points (NTPs) and includes any equipment that may
provide the NTP. Signals between terminal equipments are subject to impairments during their transfer over the
connection. The limits to these impairments are stated in the present document although in practice the overall
performance may be considerably better.
The leased line provides access to the voice bandwidth (300 Hz to 3 400 Hz) with no restrictions on the use of the
frequencies. The requirements of the present document have been chosen primarily for the transmission of telephony
although there is no restriction on the use of the leased line for other types of traffic.
The present document 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.
The tests specified in the present document cannot be carried out, nor can performance be monitored 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 the leased line is brought into or
returned into service.
The present document covers the physical, mechanical and electrical characteristics of the network interface and
specifies the conformance tests for the connection characte (...abbreviated)