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:
Aug. 24, 1976
Filed:
Dec. 18, 1974
Douglas Stanley Larner, Twickenham, EN;
Velauthar Kopalapillai Thillainayagam, Maidenhead, EN;
Ronald William Blackmore, Maidenhead, EN;
Barry Michael Hill, Maidenhead, EN;
Plessey Handel und Investments A.G., Zug, CH;
Abstract
A repeater for a digital data-transmission system using a disparity-displaying digital code comprises a digital regenerator and error-detecting means therefor and in which supervisory control means incorporated in the repeater is operative upon reception of an interrogate pulse signal over one access path also used as a digital-data path, to cause a response signal to be returned over the access path according to the prevailing state of the error detecting means. The response signal comprises a different number of pulses for each of the two possible output states of the error detecting means. The repeater may be the first of a pair of repeaters of a particular repeater station, both repeaters including at least substantially identical digital regenerators and error-detecting means. The repeaters are incorporated in different digital data-transmission paths and are so interconnected that the reception of an interrogate pulse signal by the first repeater is effective in that the aforesaid response signal takes into account th prevailing state of the error-detecting means serving the digital regenerator of the second repeater.