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Synchronization of asynchronous data signals

  • US 4,791,652 A
  • Filed: 06/04/1987
  • Issued: 12/13/1988
  • Est. Priority Date: 06/04/1987
  • Status: Expired due to Term
First Claim
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1. A method of synchronizing an asynchronous signal to produce a synchronized signal by stuffing the asynchronous signal in dependence upon a stuff request signal produced from a comparison of phases of the asynchronous and synchronized signals, wherein the synchronized signal comprises time division multiplexed frames each including data bits, at least one stuffing opportunity bit, and at least one overhead bit, and a plurality of said frames constitute a superframe in which at least two frames comprise different numbers of data and/or overhead bits, comprising the step of modifying the production of the stuff request signal in dependence upon a waveform having a period equal to that of the superframe thereby to distribute stuffing among said frames in the superframes.

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