5B6B coding rule inverse conversion circuit for digital transmis

Details 5B6B coding rule inverse conversion circuit for digital transmis 5B6B coding rule inverse conversion circuit for digital transmis

1991-11-05

1994-03-08

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from 'n' out of 'm' codes

341 95, 341 64, 36471509, H03M 1302

Patent

active

052931650

ABSTRACT:
A circuit for inversely converting the signal of six bits converted by the 5B6B coding rule conversion method in the digital transmission into the original signal of five bits is described. On the occasion of inversely converting the 6-bit signal to the original 5-bit signal, the mark rate of the 6-bit signal to be converted inversely is detected in accordance with the 5B6B coding rule conversion pattern. In this case, all patterns of six bits are not detected but such six bits are divided into the upper three bits and lower three bits and the mark rates of six bits are detected from the patterns of upper three bits and lower three bits. Thereby, a number of detected patterns can be reduced and simplification of circuit structure can also be realized.

REFERENCES:
patent: 4189716 (1980-02-01), Krambeck
patent: 4498177 (1985-02-01), Larson
patent: 4855742 (1989-08-01), Verboom

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