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:
Oct. 15, 1985
Filed:
Nov. 29, 1983
Kalman Szechenyi, Spielberg, DE;
International Standard Electric Corporation, New York, NY (US);
Abstract
For locating faults in digital telecommunication subscriber terminations various test loops (A, B, C) are closed and checked by signals transmitted via the exchange (16). When a fault is proved to exist in the so-called C-loop, it cannot be detected whether the fault is in the subscriber line (2) or in the network termination (1). In order to be able to distinguish between the two sources of fault, and when the subscriber line (2) is in an unobjectionable state, the filter coefficients which are continuously adjusted in a recursive filter contained in the echo canceller (24) of the subscribers group circuit (17), are stored. Since, in the case of a faulty subscriber line (2), the echo canceller (24), based on the received pulse answer, adjusts changed filter coefficients, it is possible to localize the location of fault by way of comparing the continuous coefficients with the stored coefficients.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile