Transmission circuit for transmitting fixed-length data

Details Transmission circuit for transmitting fixed-length data Transmission circuit for transmitting fixed-length data

1994-09-23

1996-05-07

Beausoliel, Jr., Robert W.

Excavating

370 60, G06F 1100, H04Q 1104

Patent

active

055153860

ABSTRACT:
A transmission circuit transmits a normal cell data and an idle cell data via a communication line. The idle cell data is transmitted to fill time slots in the communication line at which there is no normal data to be transmitted, each of the normal cell data and idle cell data including first data, second data and third data. The first, second and third data of the normal cell data respectively indicate a destination, an error correcting code of the first data and desired information. The first and second data of the idle cell data have predetermined bit patterns and the third data of the idle cell data may have any arbitrary bit pattern. The transmission circuit includes a first output circuit for outputting the normal cell data, an error correcting code generator for generating the second data based on the first data of the normal cell data supplied from the first output circuit, a second output circuit for outputting the first and second data of the idle cell data, a scrambler for scrambling the third data of the normal cell data supplied from the first output circuit, and a selector for selecting one of the first output circuit, the error correcting code generator, the second output circuit and the scrambler in accordance with a predetermined order, so that the normal cell data and the idle cell data are output from the selector.

REFERENCES:
patent: 4518960 (1985-05-01), Clark
patent: 5124977 (1992-06-01), Kozaki et al.
patent: 5228031 (1993-07-01), Mertelmeier et al.
patent: 5228032 (1993-07-01), Mertelmeier et al.
patent: 5230002 (1993-07-01), Yamashita et al.

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