Method for detecting transmitting control code using M our of N

Details Method for detecting transmitting control code using M our of N Method for detecting transmitting control code using M our of N

1990-02-27

1993-09-21

Lee, Thomas C.

Multiplex communications

Wide area network

Packet switching

370 13, 370 15, 370 17, 379 5, 379 10, 364514, 3649427, 364DIG2, H04J 116, H04J 314, H04M 124

Patent

active

052476901

ABSTRACT:
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.

REFERENCES:
patent: 3761809 (1973-09-01), Lockitt et al.
patent: 4523325 (1985-06-01), Justus
patent: 4584579 (1986-04-01), Frost et al.
patent: 4899159 (1990-02-01), Marchant
patent: 5010544 (1991-04-01), Chang et al.

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