High-speed backplane bus with low RF radiation

Details High-speed backplane bus with low RF radiation High-speed backplane bus with low RF radiation

1996-06-07

1999-04-13

Gregory, Bernarr E.

Cryptography

Cryptanalysis

380 6, 380 33, 380 49, 380 59, H04L 900, H04K 110

Patent

active

058945172

ABSTRACT:
A method and apparatus for substantially reducing electromagnetic radiation from a backplane used to interconnect multiple communication modules. Data signals to be transmitted onto the backplane are first scrambled using a pseudorandom code sequence, to reduce energy peaks in the radiation spectrum and to spread energy over a wider bandwidth. Signals received from the backplane are descrambled using an identical pseudorandom code sequence. Data rate synchronization is provided by recovery of a data clock signal from the received scrambled signals, and data frame synchronization is provided by transmitting data frame headers as non-scrambled data. At a receiver module, the frame headers are detected and used to reset the descrambling operation.

REFERENCES:
patent: 4563546 (1986-01-01), Glitz
patent: 4932057 (1990-06-01), Kolbert
patent: 5036542 (1991-07-01), Kehoe et al.
patent: 5165098 (1992-11-01), Hoivik
patent: 5297201 (1994-03-01), Dunlavy

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