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. 08, 2002
Filed:
Oct. 07, 1998
Akitsugu Ooyoshi, Kawasaki, JP;
Nobuo Shirai, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A looping detection apparatus used in a frame-relay communications system and capable of detecting looping without fail through confirmation of link completeness according to a two-way PVC status confirmation procedure. A status enquiry message transmitting unit transmits a status enquiry message with a first identification code carried at a predetermined position of a signal by means of which the status enquiry message is transmitted. On receiving the status enquiry message, a status response message returning unit creates a status response message based on the status enquiry message and sends the status response message back to a first node with a second identification code carried at the predetermined position. When a status enquiry message is received, a judging unit checks the code carried at the predetermined position to determine whether or not a loop has occurred in the channel between the first and second nodes, and judges that a loop has occurred in the channel if the received message carries the first identification code.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile