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:
Nov. 21, 1995
Filed:
Jan. 26, 1994
Ronald E Fuhs, Rochester, MN (US);
William A Hammond, Jr, Rochester, MN (US);
George W Nation, Eyota, MN (US);
Steven L Rogers, Rochester, MN (US);
John C Willis, Rochester, MN (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A retry filter and circulating echo apparatus and method are provided for a digital processing system of the type having multiple nodes that communicate via one or more unidirectional rings. The nodes of a digital processing system communicate packets to each other over a unidirectional ring bus. An origination node allocates a sequence identification and transmits a packet to a destination node, which generates a first echo packet and also sets a packet filter indication to drop any further copies of that packet. The first echo packet is sent to the origination node as a confirmation. The origination node generates a second echo packet and sends the generated second echo packet onward to the destination node again as an indication that the packet will not be retransmitted. The destination node transmits a third echo packet as an indication that the sequence can be deallocated.