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A simple inexpensive system for checking transmission on subscriber lines has been developed. The system includes a small portable loop checker for use at the customer location and a sweep-frequency generator located at the central office. Operational field trials to determine the most effective methods of applying the system and the results obtained are discussed.
American Institute of Electrical Engineers, Part I: Communication and Electronics, Transactions of the (Volume:82 , Issue: 2 )
Date of Publication: May 1963