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. 16, 2012
Filed:
Dec. 28, 2001
Øyvind Holmeide, Oslo, NO;
Tor Skeie, Hønefoss, NO;
Christoffer Apneseth, Oslo, NO;
Svein Johannessen, Oslo, NO;
Trond Lokstad, Nesoddtangen, NO;
Øyvind Holmeide, Oslo, NO;
Tor Skeie, Hønefoss, NO;
Christoffer Apneseth, Oslo, NO;
Svein Johannessen, Oslo, NO;
Trond Lokstad, Nesoddtangen, NO;
ABB Research Ltd., Zurich, CH;
Abstract
The present invention relates to a method for identifying inaccurate time measurements in a local area network. The local area network comprises a sending device (), such as a time client, a destination device (), such as a timeserver, and a switching device and/or a store-and-forward device (). A time request packet () is rejected if it arrives at the time client or timeserver within a given or calculated minimum distance from the preceding network packet. The time request packet () is also rejected if it falls outside a set of calculated error limits based on a set of estimates. Those estimates are kept in the time client memory and updated according to a given set of rules.