ITU-T U 30-1988 SIGNALLING CONDITIONS FOR USE IN THE INTERNATIONAL GENTEX NETWORK《国际电路交换公众电报网使用的信令状况》.pdf

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 5 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU4%,%2!0(G0G037)4#().%.4%8G0G03).!,).3).!,).G0G0#/.$)4)/.3G0G0(b) that the differences between signalling conditions in the telex and the gentex networks are essentially dueto the possibility of using overflow

2、 in the gentex network, and the absence of charges in it,unanimously declares the following view1 The recommendations in 1 to 12 of Recommendation U.1 (Signalling conditions to be applied in theinternational telex service) shall also apply to the gentex network subject to the following changes:1.1 P

3、roceed-to-transmit signal (Recommendation U.1, 5.2)The proceed-to-transmit signal is not used in the gentex network, since switching is always automatic.1.2 Selection signalsRecommendation U.1, 6.3 should read as follows for the gentex network:If there is selection towards a system in which selectio

4、n is by teleprinter signal, the prepare-for-digits signalwill normally be combination No. 30 (figure-shift). By agreement between the Administrations concerned, thiscombination could be replaced by another combination for gentex calls over circuits used for gentex and telex trafficsimultaneously, if

5、 the network of the country of arrival can ensure barring between the two kinds of traffic.2 Table 1b/U.1 (signal characteristics) applies to the gentex network.3 Recommendation U.2 (Standardization of dials and dial pulse generators for the international telex service),Recommendation U.3 (Arrangements in switching equipment to minimize the effects of false calling signals), andRecommendation U.5 (Requirements to be met by regenerative repeaters in international connections), apply to thegentex network.