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Method and system for selectively accessing multiplexed data transmission network for monitoring and testing of the network

  • US 4,059,729 A
  • Filed: 06/09/1976
  • Issued: 11/22/1977
  • Est. Priority Date: 06/09/1976
  • Status: Expired due to Term
First Claim
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1. In a multiplexed data transmission system receiving data from a plurality of data channels and time division multiplexing the received data for transmission over a transmission path as a multiplexed data stream containing a predetermined pattern of framing signals together with the data from the plurality of data channels positioned in time at predetermined data channel locations relative to the pattern of framing signals, a system for accessing data of a desired data channel comprising:

  • line access means connected in series with the transmission path for accessing the multiplexed data stream without disturbing the transmission of the multiplexed data stream along the transmission path;

    means responsive to the multiplexed data stream from said line access means for detecting the framing signals in the multiplexed data stream;

    means for generating a control signal designating one of the plurality of data channels as the desired data channel;

    means receiving said multiplexed data stream and, responsive to said control signal and to the detected framing signals, for locating and providing access to the designated one of the plurality of data channels in the multiplexed data stream without disturbing the transmission of the multiplexed data stream over the transmission path.

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