Frame find circuit and method

Details Frame find circuit and method Frame find circuit and method

1987-05-18

1988-05-10

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

375114, H04J 306

Patent

active

047440813

ABSTRACT:
A frame word in a word-interleaved multiplexed serial data stream is detected by latching a word from the data stream and comparing it with the frame word. If there is a match, latching of consecutive words continues for at least one frame to check for the frame word in the next frame. If the compared words do not match, then a bit slip is effected so that the next word latched and compared has a different bit orientation from the preceding word, whereby in one frame words with various different bit orientations are examined for the presence of the frame word, and all possible bit orientations of the words are checked over a number of frames. The arrangement eliminates the need for one counter in the frame find circuit and simplifies its control circuitry.

REFERENCES:
patent: 4002845 (1977-01-01), Kaul et al.
patent: 4414662 (1983-11-01), Bousquet
patent: 4541104 (1985-09-01), Hirosaki
patent: 4596981 (1986-06-01), Ueno et al.
patent: 4651319 (1987-03-01), Bowlds
patent: 4674087 (1987-06-01), Green
patent: 4674088 (1987-06-01), Grover
patent: 4680766 (1987-07-01), Wilkinson

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