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.22 PAGE1 Єее† а HH аааУ Уб cмˆ4 PŽТ бPAGE2 Fascicle VII.2 Р-Р Rec. U.22 еа HH ааЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаа X  аУ Уб cмˆ4 PŽТ бRecommendation U.22 аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџH јP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр86Сб cмˆ4 PŽТ бSIGNALS INDICATING DELAY IN TRANSMISSION ON CALLS SET UP Ср8CСBY MEANS OF SYNCHRONOUS SYSTEMS Ср8<СWITH AUTOMATIC ERROR CORRECTION BY REPETITION аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаСр8=Сб cмˆ4 PŽТ бФ ФУУ(New Delhi, 1960; amended at Geneva, 1964)ФФ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHјP Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаТа ТThe CCITT,ЦЦ аЬџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџHpи P Ј XА`ИhР!(#џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџЬаУУconsidering а H аФФС С(a)СpСthat traffic observations on radio telex channels have shown that the possible delay in the reception of text transmitted by one subscriber to another is a drawback from the operating point of view. The delay may be caused by repetitions and/or difference in the modulation rate of the teleprinters (traffic from Europe to the USA). In case of such delays a subscriber is left in doubt whether he simply has to await transmission of his message over the radio path or whether the delay is due to the tardy answering of his correspondent, for which he will have to pay. Furthermore, in the case of delays due to long repetition periods a receiving subscriber may be tempted to answer prematurely, which causes garbling of the text; а H аС С(b)СpСthat to a certain extent this drawback can be offset by the application of a strict operating procedure (У У+?Ф Ф signal to invite the correspondent to transmit). However, supplementary technical measures have proved to be desirable; а H аС С(c)СpСthat a good technical solution of this problem is to use combinations No. 32 as a delay signalй9€ delay signalб cмˆ4 PŽТ б9й in the following manner: а H аТа ТТ№ ТС€ Сi)СpСcombinations No. 32 are returned to the transmitting subscriber at the rate of one every 5 seconds if he stops transmission during an interval of 10 seconds and the local storage device still contains untransmitted tape;ЦЦ а H аТа ТТ№ ТС€ Сii)СpСcombinations No. 32 are sent to a subscriber at the rate of one every 1.2 seconds if transmission is delayed by repetitions whenever condition i) does not apply;ЦЦ а H аС С(d)СpСthat the slow delay signals inform a sending subscriber that his message has not yet been received by his correspondent. The rapid delay signals inform a receiving subscriber that the received message is not yet complete and that he should not cut in; а H аС С(e)СpСthat in the case of cypher messages where combinations No. 32 may result from the coding procedure, delay signals should not be used. Also in the case of full duplex working, waiting signals cannot be used. Furthermore, it is desirable not to transmit waiting signalsй waiting signalsйб cмˆ4 PŽТ б during the settingР-Рup of semiР-Р or fullyР-Рautomatic calls, since interpolated waiting signals would complicate the discrimination of the selection signals and the callР-Рconnected signals. Therefore, the best solution seems to be to put the switching on and off of the delay signal facility under the control of the subscribers: four consecutive combinations No. 8 or No. 14 could be used for this purpose; С С(f)СpСthat the transmission of these delay signals can obviously not be imposed on an Administration that makes an international connection by a landline and radio channel, УУб cмˆ4 PŽТ бunanimously declares the view а H аФФС С(1)СpСThat, when the Administrations concerned agree that it is necessary to signal to telex subscribers about a delay in transmission over the radio telex channel, delay signals shall be used having the following characteristics: а H аТа ТТ№ ТС€ Сi)СpСcombinations No. 32 at the rate of one every 5 seconds, returned to a sending subscriber when he has stopped transmission for a period of 10 seconds and if there is still text stored;ЦЦ а H аТа ТТ№ ТС€ Сii)СpСcombinations No. 32 at the rate of one every 1.2 seconds sent to a subscriber whenever transmission over the radio channel is delayed by repetitions and condition i) above does not apply.ЦЦ а H аС С(2)СpСSending of combinations No. 32 is cut off as soon as the subscriber starts to transmit again. С С(3)СpСNo delay signal will be transmitted while the call is being put through. а H аС С(4)СpСThe calling and also the called subscribers can suppress sending of the waiting signal at the two ends of the radio circuit by transmitting four successive combinations No. 8. The waiting signal can also be started off again by transmitting four successive combinations No. 14. С С(5)СpСThe delay signal should be switched off upon reception of four consecutive combinations No. 19 (signal for transfer to data) for the duration of the call. а H аС СУУNoteФФ Р-Р Administrations must take precautions to ensure that the reception of combinations No. 32 should not cause spacing of the paper on pageР-Рprinting or tapeР-Рprinting apparatus.