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:
Nov. 09, 1993
Filed:
Jun. 14, 1991
Anagnostis Hadjifotiou, Essex, GB;
Martin J Pettitt, Victoria, AU;
Northern Telecom Limited, Quebec, CA;
Abstract
A digital telemetry system/method for locating faults in an optical transmission system including optical amplifiers, in particular optical fiber amplifiers. A supervisory codeword is applied at the transmission end of the system. At each amplifier the presence of the supervisory codeword or a distress codeword from a previous amplifier is looked for. If either codeword is detected it is relayed to the next amplifier. If neither codeword is detected a respective distress codeword is applied. At the receiver end of the system the supervisory codeword is sought or, in its absence, a distress codeword or no codeword at all and from this information the position of a system fault determined.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile