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:
Dec. 16, 2003
Filed:
Dec. 03, 1999
Andrew M Davy, Herpenden, GB;
Andrew P White, St Albans, GB;
David E Bill, St Albans, GB;
David Kirby, Hemel Hempstead, GB;
Stephen N Crocombe, Dunstable, GB;
3Com Corporation, Santa Clara, CA (US);
Abstract
A network device which is for use in an Ethernet packet-based communication system has at least one port which is capable of auto-negotiation to select between half duplex and full duplex working on a link to which the port is connected. The device includes means for monitoring the existence of late collisions between packets on said link, means for monitoring the existence of packet fragments on the link, and monitoring means for detecting and correcting for a duplex mismatch on the link partner. This monitoring means is operative to determine whether there are any late collisions and in the absence of a detection of fragments to configure the port from a half duplex mode to a full duplex mode. The monitoring means is also operative to detect the presence of fragments when the port is in full duplex mode and thereby to provide an indication that a rule relating to network size is infringed.