Physical and Transmission Characteristics of Customer Loop Plant

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Abstract
This report covers the principal physical and transmission characteristics of the Bell System customer loop plant. Items covered include a statistical characterization of physical composition, measured and calculated transmission characteristics, and measured noise and crosstalk performance. A survey conducted in 1964 provided the data base for this report and comparisons of data obtained from a similar survey in 1960 illustrate that, in many respects the composition of loop plant changes only slowly with time. Consequently, the 1964 survey results are believed to be representative of today's plant. The types of analyses presented in this paper are of increasing interest to certain Bell System customers because of the increasing number and types of services provided over local telephone facilities.

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