Abstract
VOICE-FREQUENCY signalling and dialling in long-distance telephony forms the subject of a paper read before the Institution of Electrical Engineers by W. G. Radley and E. P. G. Wright. The paper first sets forth the reasons for modern methods of signalling and dialling over long-distance telephone circuits and for preferring the use of voice-frequency methods for these purposes. An outline is given of the technical problems involved in the design of voice-frequency signalling systems and the author deals with operating requirements as well as with receiver and system design. Reference is also made to the recommendations of the International Consultative Committee on Long-Distance Telephony regarding means of avoiding interference between different signalling systems on international connexions and a forecast is given of the future development of signalling and dialling over long-distance telephone circuits. An interesting table is included which compares the various long-distance signalling systems in great detail.
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Long-Distance Telephony. Nature 149, 242 (1942). https://doi.org/10.1038/149242d0
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DOI: https://doi.org/10.1038/149242d0