The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 01, 1983
Filed:
Jun. 08, 1981
Werner Ulrich, Glen Ellyn, IL (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A method is disclosed for automatically detecting a trunk that is likely to be defective even though it passes operational tests incident to switching it into service. In a telephone system, such a trunk might, for example, be so noisy or ineffective for transmission that customers cannot communicate over that trunk. Resultingly, the trunk is likely to handle a much higher than normal number of calls with short holding times since the customers quickly discover that they cannot communicate and terminate the calls. The method is implemented via telephone call processing, memory lists, and a program routine integrated into the call disconnect sequences. It allows such defective trunks to be identified by the steps of: detecting all calls with short holding times, successively processing trunk identities which have a repetition of such short holding-time calls, and alerting the maintenance force when such trunks have been processed through several memory lists.