Multiplex communications – Wide area network – Packet switching
Patent
1985-08-19
1987-03-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 88, 371 8, H04S 316
Patent
active
046480889
ABSTRACT:
A time division multiplex ring comprising a plurality of nodes connected together by interchanged trunks (main and standby paths) in a ring type or closed loop configuration. Each node in the system includes transmitters and receivers on the main and standby paths along with bridging and switching circuits connected to data failure and other failure detection circuits for operating same arranged such that data and alarm signals are transmitted in the first direction on the main path around the closed loop and in an opposite direction on the standby path. The system is arranged such that if a failure occurs only on the main path and the standby path is unaffected, all communications are switched to the standby path. On the other hand, if the failure affects both the standby and main paths, the circuitry is switched to a configuration where the closed loop comprises portions of the standby and main path and the nodes that are adjacent the failure are connected such that the standby path bypasses those nodes whereby there is direct communication between the two nodes adjacent the failure.
REFERENCES:
patent: 4527270 (1985-07-01), Sweeton
patent: 4530085 (1985-07-01), Hamada et al.
patent: 4553233 (1985-11-01), Debuysscher
Cagle George C.
Clendening Steven J.
Hamann H. Fredrick
Kuntz Curtis
Lutz Bruce C.
Olms Douglas W.
Rockwell International Corporation
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