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:
Mar. 25, 2003
Filed:
Dec. 23, 1998
Neil Cox, Burnaby, CA;
Kent Bodell, Port Moody, CA;
Alcatel Canada Inc., Kanata, CA;
Abstract
A method of minimizing throughput delay in constant-bit-rate services carried over packet-based networks subject to variable delays, comprises, in one embodiment, the steps of receiving incoming packets in a buffer, reading out bits from the buffer at a clock frequency fi, continually monitoring the buffer fill level L , determining the maximum fill level Lmax over a plurality of successive samples, determining the minimum fill level Lmin over a plurality of successive samples, adjusting the clock frequency f to cause the maximum fill level Lmax to tend toward a target value TargetLmax, and adaptively changing said target value TargetLmax so that the minimum fill level Lmin tends toward a predetermined set-point. The rate of change of the target value TargetLmax is significantly slower than the rate of adjustment of clock frequency. The invention can be applied to other types of clock recovery.