Physical and Transmission Characteristics of Customer Loop Plant

This report covers the principal results of the 1964 Bell System customer loop survey. This survey provides a statistical characterization of physical composition, measured and calculated transmission characteristics, and measured noise and crosstalk performance of customer loop plant. Comparisons of data obtained from the 1964 survey and a similar survey made in 1960 are also presented. Several of the principal transmission characteristics of Bell System customer loop plant as defined by the 1960 loop survey were published in 1962 by R. G. Hinderliter. 1 Additional published data on the transmission characteristics of Bell System toll connections is available in a BSTJ article by I. N&sell.2 The 1964 Bell System survey was comprised of two separate surveys which were merged for analysis and presentation purposes. The basic survey was the general loop survey which consisted of a simple random sample of 1,100 main stations selected from the population of all main 3337 3346 TI-IE BELL SYSTEM TECHNICAL JOURNAL, DECEMBER