The Time Factor in Telephone Transmission*

Abstract
Until comparatively recent years the telephone engineer gave little attention to transmission time in his problems. For all practical purposes he could assume that speech was transmitted instantly between the ends of telephone circuits. The rapid extension of the distances over which commercial telephony is given and the introduction of long telephone cables has changed the situation and has introduced time problems in telephone transmission which are of large technical interest and difficulty. As a result, time problems are receiving more consideration in the technical papers published in recent years on transmission. The accompanying bibliography lists a considerable number of such papers. There seems to be no paper, however, giving a general overall picture of this subject. The present paper gives briefly such a picture.

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