Method and apparatus for detecting a transmitted control...

Details Method and apparatus for detecting a transmitted control... Method and apparatus for detecting a transmitted control...

H - Electricity

04

M

379/2

H04M 3/22 (2006.01) H04J 3/14 (2006.01) H04M 3/24 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2036683

In a data port for a digital data system in which latching loopback is implemented, a unique and efficient algorithm is utilized to achieve M out of N control byte recognition. In the algorithm, N-M+1 variable length windows are used to count identified control bytes. The algorithm opens a window when the desired byte has been detected, counts the identified bytes while the window is open, and closes the window when a non-target byte is detected. The counts in the various windows are summed to determine if M bytes have been detected. A window having the oldest byte count is effectively dropped so that the window is available to count newly-arriving target bytes.

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