54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8, 1938 [420] (2) Long radiotelegrams [421] (a) In principle, any radiotelegram containing more than 100 words shall be considered as forming a series or shall end a series in progress. [422] (b) As a general rule, long radiotelegrams, both in plain lan- guage and in code or cipher language, shall be trans- mitted in sections, each section containing 50 words in the case of plain language, and 20 words or groups in the case of code or cipher. [423] (c) At the end of each section the signal .. -. . (?) mean- ing "Have you received the radiotelegram correctly up to this point?" shall be transmitted. If the section has been correctly received, the receiving station shall reply by the letter K and the transmission of the radiotele- gram shall be continued. [424] (3) Suspension of traffic When a station of the mobile service transmits on a working- wave of a land station and thus causes interference with the said land station, it must suspend its work at the request of the latter. [425] §7. END OF TRAFFIC AND OF WORK [426] (1) Signal for the end of transmission [427] (a) The transmission of a radiotelegram shall be ended by the End oftraffc etc. signal . - . . (end of transmission), followed by the call signal of the transmitting station and the letter K. [428] (b) In the case of transmission by series, the end of each radio- telegram shall be indicated by the signal . - . and the end of the series by the call signal of the transmitting station and the letter K. [429] (2) Acknowledgment of receipt [430] (a) The acknowledgment of receipt of a radiotelegram shall be given by transmitting the letter R followed by the number of the radiotelegram; this acknowledgment of receipt shall be preceded by the following formula: call signal of the station which has transmitted, word DE, call signal of the station which has received. [431] (b) The acknowledgment of receipt of a series of radiotele- grams shall be given by transmitting the letter R followed by the number of the last radiotelegram received. This acknowledgment of receipt shall be preceded by the above formula. [432] (c) The acknowledgment of receipt shall be made by the receiv- ing station on the same wave as for the reply to the call [see §5 (2) below] [No. 393]. Ant, p. 1 511. [433] (3) End of work [434] (a) The end of work between two stations shall be indicated by each of them by means of the signal ... -. . (end of work), followed by its own call signal. [435] (b) For these signals, the sending station shall continue to use the traffic wave and the receiving station the wave for the reply to the call. 1515
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