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Collision detection technique for an optical passive star local area network using CSMA/CD

  • US 4,701,909 A
  • Filed: 07/24/1986
  • Issued: 10/20/1987
  • Est. Priority Date: 07/24/1986
  • Status: Expired due to Term
First Claim
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1. A collision detection arrangement for use in a receiver of a Carrier Sense Multiple Access Collision Detection (CSMA/CD) communication network transceiver, the arrangement comprising:

  • an input terminal for receiving a signal from the network including a packet of information which was originally transmitted comprising a preamble section including a collision detection sequence of length N bit intervals and a predetermined Hamming weight, where each transceiver of the network is assigned a separate collision detection sequence;

    means responsive to a collision detection sequence received at the input terminal for determining the Hamming weight of the collision detection sequence and for generating an output signal representative of such weight; and

    means responsive to the output signal from the determining and generating means for comparing the Hamming weight of the received collision detection sequence with a predetermined threshold Hamming weight and for generating an output signal indicative of a collision of packets of information when the Hamming weight determination exceeds the threshold Hamming weight.

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