Crosstalk and noise features of cable carrier-telephone system

CROSSTALK and noise are important factors in cable carrier transmission as outlined in the paper “A Carrier Telephone System for Toll Cables” by Messrs. C. W. Green and E. I. Green. Crosstalk and noise limit the number of carrier channels which can be utilized in any one cable, not only by limiting the number of channels which can be placed on a single pair, but by limiting the number of pairs which can be used. Noise also controls the transmission loss which can be permitted between repeaters. Without the crosstalk and noise reduction measures described in this paper, the number of carrier channels per cable would be so few and the spacing between repeaters so short, that the type-K carrier system would be impracticable.