џWPCL ћџ2BJ|xа АH аа АА X агга ХА6p&А6p&Х аеЄ† а Hр аааУ Уб cмˆ4 PŽТ б Fascicle VII.2 Р-Р Rec. U.31 PAGE1 Єее† а HH аааУ Уб cмˆ4 PŽТ бPAGE2 Fascicle VII.2 Р-Р Rec. U.31 еа HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаа X  аУ Уб cмˆ4 PŽТ бRecommendation U.31 Ср8=Сб cмˆ4 PŽТ бPREVENTION OF CONNECTION TO FAULTY STATIONS Ср8=СAND/OR STATION LINES IN THE GENTEX SERVICEФ Ф Ср8;СУУб cмˆ4 PŽТ б(former CCIT Recommendation E.9, Geneva, 1956)ФФ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТThe CCITT,ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаУУconsidering а H аФФС С(a)СpСthat correct reception of the answerback code at the beginning and end of a telegram should safeguard the correct transmission of the telegram; а H аС С(b)СpСthat it accordingly becomes essential to provide adequate signalling for cases when a teleprinter is temporarily unable to participate in the international service, on account of paper trouble, faults, etc.; УУunanimously declares the view а H аФФС С(1)СpСthat faults during the transmission of a telegram shall be signalled as far as possible by the automatic transmission of a clearing signal; УУrecognizing, however, ФФС Сthat it will be impossible to signal all faults that may occur on an established connection, УУunanimously declares the view а H аФФС С(2)СpСthat it is essential that absence of paper on a receiving teleprinter should be signalled by the clearing signal; and а H аС С(3)СpСthat, since the receiving Administration is responsible for the receipt of the telegram when the answerback signals have been correctly exchanged, it is responsible for making the necessary arrangements to ensure security of operation (for example, if the tape should break or become jammed); а H аС С(4)СpСthat in the case of a faulty station line or teleprinter at the moment of the call, the existing automatic switching networks use one or more of the following signalling conditions : no callР-Рconnected signal, busy signal, service codeУ У DERФ Ф or no return of answerback. All these signalling conditions ensure that a telegram is not transmitted over a faulty connection; а H аС С(5)СpСthat in the case of a faulty station line out of an office group it is essential that the faulty line should be busied out as quickly as possible so that traffic may be offered automatically to all the other lines in the group.