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Method and apparatus for SAS speed adjustment

  • US 8,458,527 B2
  • Filed: 09/14/2010
  • Issued: 06/04/2013
  • Est. Priority Date: 02/04/2010
  • Status: Expired due to Fees
First Claim
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1. A method for maintaining reliable communication on a bidirectional communication link, comprising:

  • detecting, by a receiver on the bidirectional communication link, an error;

    maintaining, by the receiver, a count of detected errors;

    polling the receiver, by a transmitter on the bidirectional communication link, in order to determine the count of detected errors;

    performing, by the transmitter, a downshift evaluation for the bidirectional communication link, wherein the downshift evaluation comprises;

    requiring transmission speed downshift if the difference between the count of detected errors and a stored count is greater than a predetermined value; and

    forgoing transmission speed downshift if the difference between the count of detected errors and the stored count is less than the predetermined value;

    in response to performing the downshift evaluation for the path,maintaining a transmission speed of the path if the downshift evaluation determines that forgoing transmission speed downshift is required for the bidirectional communication link; and

    reducing the transmission speed of the path if the downshift evaluation determines that transmission speed downshift is required for the bidirectional communication link.

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