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Data transmission system using an optical fiber loop

  • US 5,363,367 A
  • Filed: 08/31/1992
  • Issued: 11/08/1994
  • Est. Priority Date: 09/19/1991
  • Status: Expired due to Fees
First Claim
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1. A data transmission system comprising a plurality of data processing units having data input and output terminals, and optical fibers for connecting the output terminal of a preceding data processing data processing unit with the input terminal of a succeeding data processing unit, said plurality of data processing units being interconnected in a daisy chain by connecting all the input and output terminals of each said data processing unit to the output and input terminals of the adjoining data processing units by the optical fibers, each data processing unit comprising:

  • optical/electrical converter means for converting optical signal data supplied from said preceding data processing unit through said optical fiber to electrical signal data,electrical/optical converter means for converting electrical signal data to be sent to said succeeding data processing unit to optical signal data,data receiving means for receiving the output of said optical/electrical converter means, andgate means connected between said optical/electrical converter means and electrical/optical converter means, said gate means being closed when said data transmission system performs data transmission therefrom, and being opened in an alternative data receive/pass mode,the data to be transmitted including a data length area, and at least one of said data processing units comprising means for adding data to the data transmitted from another data processing unit, and means for rewriting said data length area in the data transmitted from said other data processing unit when new data is multiplexed with the data transmitted from said other data processing unit.

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