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:
Jul. 23, 1991
Filed:
Jul. 19, 1989
Hitachi, Ltd., Tokyo, JP;
Hitachi Software Engineering Co., Ltd., Yokohama, JP;
Abstract
A switching network having a plurality of repeater nodes, wherein each repeater node checks the number of times data packet has been received. If in excess of predetermined number, the repeater node transmits a looped trunk detection packet, the looped trunk detection packet being arranged to be written with the node address of each of the plurality of repeater nodes within a looped trunk as its repeating history. The repeater node checks whether the node address thereof is written in the repeating history or not. If the result is negative, the looped trunk detection packet is repeated and transmitted by writing the node address of the repeater node in the repeating history. If the result is positive, the repeater node does not repeat transmission of the succeeding packets from the repeater node to the route of the looped trunk, and transmits a looped trunk notification packet to repeater nodes. The looped trunk detection notification packet then forbids to repeat transmission of the succeeding packets from each of the other repeater nodes to the route of the looped trunk.