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- Recommendation U.4
- EXCHANGE OF INFORMATION REGARDING SIGNALS
- DESTINED TO BE USED OVER INTERNATIONAL CIRCUITS
- CONCERNED WITH SWITCHED TELEPRINTER NETWORKS
- (former CCIT Recommendation E.4, Geneva, 1956;
- modified at New Delhi, 1960 and Geneva, 1972)
- The CCITT,
- considering
- (a) that certain signals and certain characteristics of signals used in the
- international telex service have been standardized in Recommendation U.1;
- (b) that certain Administrations have introduced automatic telex transit
- switching facilities based upon the signalling standards shown in Recommendation
- U.1;
- (c) that standardized signals for the European switched network for the
- public telegram service (gentex network) are advocated in Recommendation U.30;
- (d) that in view of the foregoing an exchange of information regarding the
- precise nature of the signals proposed to be used in the above-mentioned services
- by interested Administrations would be very useful;
- (e) that certain Administrations have already supplied such details
- regarding their telex services in a useful form (see supplements to the documents
- of the VIIIth Plenary Assembly of the CCIT, and subsequent Plenary Assemblies of
- the CCITT),
- unanimously recommends
- that Administrations concerned in the international telex service and
- gentex network be invited to supply to the CCITT time-sequence diagrams showing
- in each case the signals at present transmitted or proposed to be transmitted
- over the international circuit for incoming calls. The diagrams should show not
- only the sequence and characteristics of the signals, but also the timing
- tolerances to be expected. The diagrams should show the signalling conditions
- applicable to transit as well as to terminal calls, including any conversion of
- the signals that are received from the destination network.
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- Fascicle VII.2 - Rec. U.4 PAGE1
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