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DATA TRANSMISSION SYSTEM

  • US 3,803,405 A
  • Filed: 01/24/1972
  • Issued: 04/09/1974
  • Est. Priority Date: 10/09/1968
  • Status: Expired due to Term
First Claim
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1. In a time multiplex multiple access data transmission system composed of a plurality of user locations connected to a common transmission medium at more than two different points thereof for transmitting messages, including address data, tHrough such medium, and multiplex means for multiplexing the individual messages for delivery to the transmission medium, the improvement wherein:

  • said medium comprises two transmission channels disposed parallel to one another;

    each channel is composed of a series of optical fiber segments and a plurality of intermediate amplifiers connecting said segments together in series and each connected to a respective user location;

    said amplifiers in one said channel are oriented to conduct signals in one direction while said amplifiers in the other said channel are oriented to conduct signals in the opposite direction; and

    each said user location has an outgoing line connected to the input of its respective amplifier in at least the one said channel and an incoming line connected to the output of its respective amplifier in at least the other said channel; and

    wherein said system further comprises means associated with each said location for monitoring the entire data flow through said medium and automatically selecting that data intended for said location.

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