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Networking device and method for making cyclic redundancy check (CRC) immune to scrambler error duplication

  • US 6,609,226 B1
  • Filed: 04/10/2000
  • Issued: 08/19/2003
  • Est. Priority Date: 04/10/2000
  • Status: Expired due to Term
First Claim
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1. A networking device comprising logic employed within a physical layer of the device to modify an original cyclic redundancy check (CRC) value associated with a message and enable detection of a duplication of bit errors at a targeted destination of the message, the logic comprises a scrambler that comprises (1) a CRC engine to calculate a value based on a bit sequence including a state of the scrambler prior to scrambling a body of the message and a plurality of zero bits equal in number to a bit size of the message, and (2) an adder to perform modulo 2 addition on the value and the original CRC value of the message to produce a modified CRC value.

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