Data handling capacity of a real transmission line. I. Noiseless case

A computation technique is described for determining the maximum error-free data rate for a transmission line whose attenuation and phase shift are known at discrete frequencies. Results are obtained from manufacturer´s data for commercially available twisted pair lines of gauges AWG 19, 22, 24, and 26, for lengths up to about five kilometers. The capacity of each line appears to fall off somewhat more strongly with line length than the inverse length dependence that is conventionally accepted, but not as strongly as the inverse square rate assumed in some work