A Method for the Design of Equalizers for High-Grade Channels Transmitted Over Telephone Cable Pairs of Mixed Gauges

The telephone exchange cable plant may be a mixture of several gauges in a particular run. Predicting its electrical behavior precisely when only one gauge is involved is difficult at best. Gauge mixtures and the lack of accurate records preclude the computational course in the practical case. A method is given for the graphical analysis of cable attenuation obtained from measurements. A means for locating the pole and zero frequencies of the equalizer network is described, as is the use of a frequency response slide rule for rapidly verifying the results. In addition, it is shown that the use of a time-sharing computer can be helpful in specifying components and in the general administration of equalizer projects when large numbers are involved.