Method and apparatus for transmission of digital data

Details Method and apparatus for transmission of digital data Method and apparatus for transmission of digital data

1987-10-29

1989-03-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

370 89, 371 37, 371 55, 375 34, H04J 316, H04L 100

Patent

active

048113611

ABSTRACT:
A method and apparatus for transmission of digital data in which data words having M parallel bits are encoded into code words having N parallel bits, the code words being serially transmitted and being accompanied by flags such as Start Delimiter, End Delimeter of the frame or token. The code words and the flags are selected so as to balance the DC component. The time interval between two successive transitions of the serially transmitted signals is limited to four times the period of the serial transmission clock. For detection of errors in transmission, the Hamming distance between a flag and any encoded sequence of the same length extracted from any message is at least equal to 2. The invention is useful with transmitters and receivers that exploit the properties of the transmission method, and is applicable to data networks.

REFERENCES:
patent: 3631471 (1971-12-01), Griffiths
patent: 4346472 (1982-08-01), Ohkoshi et al.
patent: 4433416 (1984-02-01), Kojima
patent: 4486739 (1984-12-01), Franaszek et al.
patent: 4569050 (1986-02-01), Ohme
patent: 4669000 (1987-05-01), Odaka et al.

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