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Local area data communication network

  • US 4,602,364 A
  • Filed: 04/23/1984
  • Issued: 07/22/1986
  • Est. Priority Date: 04/23/1984
  • Status: Expired due to Fees
First Claim
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1. A data communication network over which data handling devices connected thereto can transmit and receive messages among themselves, comprisingbus means, anda plurality of subnetworks, each subnetwork comprisinginterface means for connecting a plurality of said devices to said subnetwork, andconcentrator means for connecting said interface means to said bus means,said interface means and said concentrator means further comprisingtransceiver means for transmitting, to said bus means and to devices connected to said subnetwork, messages originating from devices connected to said subnetwork, and for receiving from said bus means messages originating from other said subnetworks,collision avoidance means for monitoring transmission attempts by said devices connected to said subnetwork, detecting competing such transmission attempts that would create a collision on said subnetwork, and, upon such detection, permitting a selected such attempt to enter said subnetwork while preventing other such attempts from entering said subnetwork, andcollision detection means for monitoring said bus means and preventing all said attempted transmissions from entering said bus means when a message from another said subnetwork is present on said bus means.

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