scope:

The present document is applicable to an analogue presented Network Termination Point (NTP) intended to deliver 3,1 kHz voiceband services which terminates a Public Switched Telephone Network (PSTN) with short to medium length 2-wire local loops, or equivalent NTPs, independently of the technologies used in the access part of the network itself. For the purpose of the present document, a "short to medium length 2-wire local loop" has a loop resistance not greater than 750 Ω.

NOTE 1: The local loop might use xDSL or other technologies. The network itself might also be of different types. There may be a need for filtering in case of non-desirable connections (signal transfer) between these technologies and the NTP specified in the present document.

The present document applies to NTPs where any terminal equipment (TE) connected to NTP is connected via a cable with a maximum loop resistance of 100 Ω.

NOTE 2: This is equivalent to approximately 500 metres of cable with 0,5 mm diameter copper conductors.

The objective of the present document is to specify the physical and electrical characteristics at an analogue NTP particularly suitable for use for new network deployment; operators of existing PSTNs are not expected to modify their network to align with the present document. The present document specifies characteristics of the NTP to enable it to operate with most existing national PSTN TE, and especially with PSTN TE designed according to the European standards for analogue presented TEs.

The electrical conditions specified at the NTP are sufficient to ensure satisfactory operation of the following functions of TE:

a) call control;

b) transmission;

c) dialling;

d) ringing.

The present document does not specify the design characteristics of an equipment that delivers the NTP.

NOTE 3: However, where the line length between the NTP and the equipment that delivers the NTP is very short, the requirements of the present document becomes de-facto design requirements for the line card of the equipment that delivers the NTP. See figure 1 for clarity.