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:
Dec. 15, 1981
Filed:
Jul. 31, 1979
Leslie A Baxter, Eatontown, NJ (US);
Peter Cummiskey, Clark, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
There is disclosed a digital loop circuit for controlling synchronization around a closed loop communication system. The control circuit is designed to automatically adjust the delay of the loop to maintain a constant frame bit length without regard to the number of stations connected into the loop. As stations are added or subtracted from the loop, the system operates to add or subtract delay as necessary. A FIFO register having a bit capacity equal to the frame size is inserted serially in the loop and a separate clock is used to control the input and the output of the FIFO register. If a unique frame bit is not received in the anticipated position the output FIFO clock skips one count per frame thereby adding delay to the loop. The loop control circuit operates for situations where the framing bit is on a separate channel and also when the framing bit is on the actual data channel.