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. 08, 1999
Filed:
Aug. 25, 1997
Takashi Nishimura, Kawasaki, JP;
Naohide Sekiya, Kawasaki, JP;
Takeshi Kimura, Kawasaki, JP;
Hideki Inoue, Kawasaki, JP;
Hiroshi Nagano, Kawasaki, JP;
Ikuo Taoka, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
In a switching hub capable of realizing a high-speed LAN communication, this switching hub is equipped with a switch unit and a plurality of ports connected to this switch unit. When a frame is received from a terminal, each of these ports attaches a tag to which a transmission source LAN number has been set to this received frame, and thereafter supplies the frame with this tag to the switch unit. When the frame with tag is received from another port within another switching hub, the port directly supplies this frame with tag to the switch unit. The switch unit registers the transmission source LAN number of the supplied frame, a transmission source MAC address, and an input port number into a LAN table. While such a port for supplying a frame is determined, either a transmission source address of this frame or a transmission source LAN number thereof is used as a retrieve key so as to try to read out the port number from the LAN table. In the case that the port number cannot be read out, the switch unit performs the broadcast operation. When the destination LAN number can be found out by retrieving the LAN table, the next switching hub is notified by setting a tag to this destination LAN number.