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:
Apr. 21, 1998
Filed:
Dec. 15, 1995
Gary S Muntz, Lexington, MA (US);
Stanley A Lackey, Jr, Groton, MA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
An improved SRTS clock recovery system of a network node that adjusts the range of a received source RTS sample and a locally generated destination RTS sample to compensate for inherent characteristics of a network system. In addition, the improved system extends the range of the RTS samples to properly interpret large phase differences between a source node clock and transmit clock generated by the network node. This novel technique for interpreting source and destination RTS samples enables the improved network node to accurately recover a source clock frequency from a network transmission in a highly stressed network system. Specifically, the SRTS clock recovery system includes an RTS sample interpreter having a slope determinator for determining the expected average change in source and destination RTS samples over time. A slope compensator of the interpreter scales the range of RTS sample slopes to compensate for this expected average change in samples, thereby increasing the range of usable RTS sample slope values, while a range extender increases the number of phase values that the RTS sample slopes represent to accommodate large phase differences between the source and destination clock frequencies.