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:
Mar. 16, 1982
Filed:
Dec. 06, 1979
Hideyasu Mori, Hino, JP;
Eizo Kishikawa, Machida, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A method for testing communication paths of an electronic exchange which has at least one pair of time-sharing communication highways and in which a plurality of port circuits are connected to one another in time-sharing fashion through the first and second communication highways. In the method, test data are allotted to prescribed time slots and are transferred to receiving means through the communication highways. The test data are fed back from the port circuits whose hybrid transformers are in non-matching state, then allotted to different time slots, and finally transferred to a dual tone multi-frequency signal receiver through the communication highways.