1、CEPT T/CS*LY-OL*E 76 232bYLY 00044qZ O - TCS14-01 Page 1 E Recommendation T/CS 14-01 (Stockholm 1976, revised in Brussels 1980 and Cannes 1983) USE OF SIGNALLING SYSTEM R2 IN EUROPEAN TELEPHONE NETWORKS Recommendation proposed by Working Group T/WG 11 “Switching and Signalling” (CS) Revised text of
2、the Recommendation adopted by the “Telecommunications” Commission: “The European Conference of Postal and Telecommunications Administrations, considering - the result of study of Questions Tph 29, TIT 3 and CS 2, which led to the elaboration and updating of the detailed - that the CCITT accepts and
3、recommends the same System R 2 specifications as drawn up by CEPT; specifications of signalling System R 2; - that it is necessary to introduce standardised signalling systems in order to minimise intenvorking problems and the number of different types of equipment, o recommends to the members of th
4、e CEPT, that in conditions below, the Signalling System R 2 is used for automatic and semi-automatic telephone service: - System R 2 can be used for national, regional and international working; - the international introduction of System R 2 will be subject to preliminary agreement between the Admin
5、istrations - System R 2 is used for one-way working but the digital version of line signalling is suitable for both-way working; - System R 2 can be used for terminal or transit traffic; - System R 2 is suitable for use on satellite links; - System R 2 is not applicable to analogue circuits with spe
6、ech interpolation.” concerned ; The description and detailed specifications of System R 2 are thesubject of CCITT Recommendations 4.400 to Q.490 i. It is a channel-associated signalling system which uses two groups of six in-band signalling frequencies for end-to-end compelled interregister signalli
7、ng. For FDM channels, the analogue version for link-by-link line signalling requires an out-band signalling channel at 3,825 Hz. The digital version of line signalling employs a change of state in two signalling channels in the primasy PCM multiplex at 2,048 kbit/s, according to CEPT Recommendation
8、T/TTT 1, CCITT Recommendation G.732 2 and G.734 3. On 3 kHz spaced channels, line signals of the CCITT signalling System No. 4, in accordance with CCITT Recommendation 4.121 4, can be used for line signalling. Note 1: This Recommendation replaces Recommendations T/Tph 16 (Pontresina 1969) and T/TIT
9、2 (Montreux 1970). Note 2: Recommendations T/CS 42-02 151 and T/CS 42-03 6 correspond to CCITT Recommendations Q.411,Q.412,Q.414,Q.416 and Q.421, 4.422, Q.424 respectively. References I CCIT Recommendations 4.400 to Q.490. Specifications of signalling System R 2. 2 CCITT Recommendation G.732. Charac
10、teristics of primary PCMmultiplex equipment operating at 2,048 kbitls. 3 CCITT Recommendation 4.734. Characteristics of 2,048 kbitlsfiame structure for tise with digital exchanges 4 CCITT Recommendation 4.121. Signal code. 5 Recommendation T/CS 42-02. System R 2 line signalling, analogue version. 6 Recommendation T/CS 42-03. System R 2 line signalling, digital version. O Edition of May 15, 1986
