A systemwide survey of the transmission performance of Bell System intertoll trunks was undertaken in 1964. The sample design used for the survey is described briefly. The main purpose of the paper is to present survey results. Thus, the physical composition and some physical attributes of the trunks are given. The transmission measurement procedures are summarized, and measurement results are presented in distributional form for 1000‐Hz loss, frequency response, background noise, impulse noise, and relative envelope delay. Among the results noted are an increase in average noise level and a decrease in noise level standard deviation as the trunk length is increased. The frequency response of long trunks is superior to that of short trunks. Measurement results are presented separately for major transmission facilities
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