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. 23, 1990
Filed:
Jun. 20, 1988
Thomas C Sparks, Nepean, CA;
Bell-Northern Research Ltd., Ottawa, CA;
Abstract
In some digital communications systems, such as the Integrated Services Digital Network (ISDN), problems may occur in recovering timing from signals generated by several terminals located varying distances from a common transmitter. Timing recovery is facilitated by detecting a marker of a frame transmitted to the several terminal equipments, detecting a corresponding marker receives shortly afterwards from one of the terminal equipments; and sampling the received digital signal at a sampling instant delayed relative to a specific feature of the received marker, for example, a zero crossing immediately following a frame bit. Preferably, the delay between the sampling instant and the occurrence of the specific feature used as a reference point is proportional to the time elapsed between detection of the outgoing or transmitted marker and detection of the incoming or received marker and hence proportional to the round trip propagation time.