Suitability of junction cables for PCM transmission with measurements on selected KP & T cables

Abstract

An investigation into the suitability of paired, voice-frequency cables for PCM transmission and the relevant constraints involved, are given in this report. An outline of the basic concepts of a PCM system is given in Chapter One followed by a survey of the principal sources of interference in the transmission of digital signals over paired cables. It is found that near-end and far-end crosstalk and office noise are the only forms of interference that .. require specific engineering measures to combat. Supplementary factors such as line coding, cable characteristics and construction and operation of regenerative repeaters, that affect the development of line engineering methods are also discussed.