Multiplex communications – Wide area network – Packet switching
Patent
1984-10-11
1987-07-28
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 88, H04J 116
Patent
active
046835636
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.
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Rouse David M.
Wallace Richard E.
Zelms Charles M.
American Telephone and Telegraph Company AT&T Bell Laboratories
Marshall Dwight A.
Olms Douglas W.
Rokoff Kenneth I.
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