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:
Jun. 01, 2004
Filed:
Apr. 24, 2001
Hirak Mitra, Sunnyvale, CA (US);
David Stark, San Jose, CA (US);
Juniper Networks, Inc., Sunnyvale, CA (US);
Abstract
SYNC parsing for Cable Modem Clock Synchronization is implemented using software processing with hardware assist in a manner that achieves the cost benefits of software SYNC parsing with the time accuracy of hardware SYNC parsing. Hardware scans for the arrival of new MPEG frames. Whenever any MPEG frame arrives, the MPEG frame is processed to extract MAC packets. If a SYNC packet is discovered during this processing, the software determines the SYNC arrival time, a comparison is made between the time the SYNC arrival time and the SYNC time value, and the software uses the difference to adjust the Cable Modem clock. Implementation variations include different approaches to when timestamps are recorded, the calculation of the SYNC arrival time, the use of software to process the MPEG frame and MAC packets, and the use of software to perform the time comparison.