Method of estimating the capacity of multipair cables to carry low-speed p.c.m. transmission systems

A method is described whereby the probability that a multipair cable will successfully support a number of low-speed digital pulse-code modulation (p.c.m.) transmission systems operating on pairs selected at random may be estimated. The calculation assumes that the near-end crosstalk attenuation between pairs has a truncated lognormal distribution, but does not assume that the total interference has a Gaussian probability distribution.