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Railroad communication system

  • US 5,039,038 A
  • Filed: 10/03/1989
  • Issued: 08/13/1991
  • Est. Priority Date: 09/14/1983
  • Status: Expired due to Term
First Claim
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1. In a communication system for use with the control of a railroad train having a plurality of transceivers, the transceivers being located on lead and remote units of the train, a lead unit controlling the operation of a remote unit by way of a transmission which includes a command transmitted by a lead transceiver over a communication channel therebetween, a remote unit transmitting a reply to a command confirming execution of the command, and information representative of the operation of a remote unit, a system for controlling which unit transmits on the channel comprising:

  • at each respective unit,first means, associated with the transceiver of that unit, for detecting the ending of the latest transmission by any transceiver on the communication channel; and

    second means, coupled to said first means, for causing its associated transceiver to initiate a transmission upon the termination of the delay of a prescribed period of time after the detection of the ending of said latest transmission by said first means, and whereineach transmission over said communication channel is prioritized into one of a plurality of different ranges of time delay that must terminate before that transmission may be initiated, such that a higher priority transmission is initiated after a time delay that is shorter than any time delay within a range of time delays of a lower priority transmission.

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