An Automatic Transmission Measuring System for Telephone Trunks

T h e problem of t r u n k maintenance in the Bell System is magnified by the number of t r u n k s which m u s t be considered. A typical central office has more than a thousand t r u n k s and there are about 2.7 million t r u n k s in the Bell System. Proper maintenance of these t r u n k s requires routine measurements at monthly or shorter intervals. In addition, at least four different transmission measurements are required to insure proper operation. In view of the large number of measurements required, fully mechanized testing appears not only economical but necessary. The Automatic Transmission Measuring System (ATMS) discussed in this paper was developed to meet this need.