Multiplex communications – Wide area network – Packet switching
Patent
1991-07-26
1992-09-22
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 8512, 371 112, H04J 314, H04L 1242
Patent
active
051503565
ABSTRACT:
An ATM communications system has two ring transmission lines in which network nodes are connected for transmission of cells in opposite directions. Each cell contains a first identifier identifying one of the rings and a second identifier identifying a path between source and destination nodes. Each node comprises two subsystems one for each ring transmission lines. Each subsystem includes a multiplexer for forwarding a cell to a first segment of the associated ring and a cell detector for examining the identifiers of a cell from a second segment of the ring to determine its destination. A demultiplexer is normally connected to the second segment of the associated ring for terminating a cell received therefrom or passing it on to the multiplexer depending on the destination determined by the cell detector. A fault on the second segment of the associated ring is detected by a fault detector. In response to the detection of a fault by the fault detector, a connection is established from the multiplexer of the other subsystem to the demultiplexer of the own subsystem, and the latter is disconnected from the second segment of the associated ring.
REFERENCES:
patent: 4530085 (1985-07-01), Hamada et al.
patent: 5003531 (1991-03-01), Farinholt et al.
patent: 5091902 (1992-02-01), Chopping et al.
Jung Min
NEC Corporation
Olms Douglas W.
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