Abstract
A systemwide survey of the transmission performance of built-up toll connections was undertaken in 1966. The sampling plan underlying this survey is discussed briefly. The results are presented in terms of distributions of background noise levels, 1000 Hz loss, phase jitter, time to connect, and airline distance between end offices. The measurement results are broken down by mileage categories. Comparisons are made with the results from the 1962 connection survey. It is found that noise performance has improved since 1962 while loss performance is virtually unchanged.
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