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System for transmitting data between systems using selected subsets of plural interconnecting bus lines and including selection of a compatible transmission speed

  • US 5,442,750 A
  • Filed: 12/02/1993
  • Issued: 08/15/1995
  • Est. Priority Date: 10/04/1991
  • Status: Expired due to Term
First Claim
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1. A method for transmitting data between a plurality of nodes of a communications network, each node having a maximum speed for receiving data words, said plurality of nodes connected on a communication bus having a bus width at least equal to a data word within a data packet and comprising a plurality of bus subsets of bus lines connecting the plurality of nodes, each bus subset comprising at least two bus lines, each node being directly connected to every bus line of every bus subset, the plurality of bus subsets in aggregate comprising the communication bus, the method comprising the steps ofdetermining, at a transmitting node, at least one of said plurality of bus subsets over which the transmitting node can communicate with an intended destination node receiving said data,selecting, at the transmitting node, a speed at which to send said data words, within a range of the maximum speeds which said nodes can receive data words, based on a highest maximum speed at which only nodes acceptably determined to communicate with said transmitting node can receive said data words,sending each data word within said data packet as a sequence of multibit subwords over said at least one of said plurality of bus subsets selected from said plurality of bus subsets acceptably determined to communicate with said transmitting node, andsaid destination node, sending over a bus subset control line, during a data transmission of said data packet, a warning signal for informing the transmitting node of an overflow condition at the destination node.

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