ITU-T M.1350 PDF

General

This Recommendation deals with the setting up, lining up and characteristics of international data transmission systems operating at speeds in the range 2.4 to 14.4 kbit/s. The system may be a single connection operating at 2.4, 4.8, 7.2, 9.6 or 14.4 kbit/s, or a combination of the lower speed systems, multiplexed onto the 9.6 or 14.4 kbit/s system.

These systems may be carried on data links comprised of voice grade circuits (either analogue or digital), or multiplexed onto higher bit rate data transmission systems as described in Recommendation M.1300.

The system may terminate at terminal international centres, terminal national centres or, when multiplexing is employed to derive several channels, a combination of several termination configurations may be provided. See Figure 1/M.1300 and Figure 2/M.1300 for further information.

When an international data transmission system is assigned its designation (according to Recommendation M.140, §§ 3.2.15 and 11 [1]), the Administration with control station responsibility will assemble the necessary technical and operational information. This should be entered into the list of Related Information (as defined in Recommendation M.140, § 12 [1]) which consists of the items shown in Annex A to this Recommendation.