Multiplex communications – Wide area network – Packet switching
Patent
1986-10-15
1988-04-26
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 13, 370 88, H04J 326, H04J 314
Patent
active
047409584
ABSTRACT:
A data transmission system is described, comprising a plurality of processing nodes (10-13). At any given time, one of the nodes acts as a star coupler, for broadcasting messages to all the other nodes. This node uses a plurality of counters (361-363) to keep track of the amount of available space in the receive buffers (351) of the other nodes. Whenever a message is broadcast, all the counters are decremented. Conversely, whenever an acknowledgement signal is received, indicating that one of the other nodes has removed a message from its buffer, the corresponding counter is incremented. If any of the counters indicates that a buffer is full or nearly full, broadcasting is suspended. If any of the nodes develops a fault, preventing it from removing messages from its buffer, it transmits a constant stream of acknowledgement signals, thereby preventing the corresponding counter from indicating "full" and hence allowing the system to continue running.
REFERENCES:
patent: 4475192 (1984-10-01), Fernow et al.
patent: 4499576 (1985-02-01), Fraser
patent: 4607363 (1986-08-01), Platel et al.
Duxbury Colin M.
Yates Raymond
International Computers Limited
Olms Douglas W.
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