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. 28, 1987
Filed:
Oct. 11, 1984
David M Rouse, Columbus, OH (US);
Richard E Wallace, Newark, OH (US);
Charles M Zelms, Worthington, OH (US);
American Telephone and Telegraph Company, AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A data communication network comprising ring transmission paths (0,1) interconnecting ring interface nodes (RI1, RI2, RI3) coupled with a node processor and data systems and arranged to propagate data messages along the ring transmission paths between the data systems. Each node is arranged to detect failure of the node to propagate a data message to another node and to flush the data communication network by force reading data messages off the ring transmission paths into the blocked node processor. A node is arranged to automatically maintain and restore operation of the data communication network by loop connecting ones of the ring transmission paths together to isolate segments of the network experiencing trouble and to transfer maintenance and diagnostic data messages between ones of the looped ring transmission paths to restore ring transmission paths and nodes located in isolated segments of the network to service.