Dual-ring atm communications system

Details Dual-ring atm communications system Dual-ring atm communications system

H - Electricity

04

J

H04J 3/14 (2006.01) H04L 12/42 (2006.01) H04L 12/437 (2006.01) H04L 29/14 (2006.01) H04Q 11/04 (2006.01) H04L 12/56 (2006.01)

Patent

CA 2047949

- 14 - ABSTRACT OF THE DISCLOSURE 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 fording 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.

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