Method and apparatus for detecting a frame alignment word in a d

Details Method and apparatus for detecting a frame alignment word in a d Method and apparatus for detecting a frame alignment word in a d

1991-02-13

1993-04-20

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701054, H04J 306

Patent

active

052048594

ABSTRACT:
A method and apparatus is provided for detecting a frame alignment word in a data stream. The apparatus comprises a storage circuit (9) arranged to receive a data stream and pass each bit of the data stream serially through each location of the storage circuit. A template pattern means (10), arranged to generate a template pattern, is connected to the storage circuit (9) and arranged in bit groups, each group generating an output signal when it identifies a group of bits corresponding to its template pattern. A decoder circuit (B) is arranged to receive the output signals from the groups and generate a decoder output signal when a specified number of groups match the template pattern indicating that the frame alignment word has been detected.

REFERENCES:
patent: 4358845 (1982-11-01), de Passoz
patent: 4367549 (1983-01-01), Vachee
patent: 4641326 (1987-02-01), Tomisawa
patent: 4811367 (1989-03-01), Tajika
patent: 4829518 (1989-05-01), Iguchi
patent: 4943985 (1990-07-01), Gherardi
patent: 4979169 (1990-12-01), Almond

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