Pre-scramble encoding method and apparatus for digital communica

Cryptography – Cryptanalysis

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

380 49, H04L 900

Patent

active

054106001

ABSTRACT:
A prescramble encoding mechanism divides a data word into a plurality of sequences of data bits for transmission over a fiber optic communication link. Complementary versions of control bits and odd and even parity bits are interleaved between the bit parallel data and control signals, divides a parallel data word possible series of consecutive bits of the same logical state is less than a predetermined number related to the length of the data bit sequences and to placement of the complementary control bits and even and odd parity bits. The data frame is then scrambled prior to transmission over the fiber optic link. Depending on the exact nature of the scrambling and descrambling process, a single-bit link error may produce a plurality of bit errors in the descrambled frame. To increase the likelihood that the link error will be detected by the parity checks in the descrambled frame, a frame may be resequenced to separate adjacent bits prior to scrambling and resequenced back to the original sequence after descrambling. As a consequence, a single-bit link error which causes multiple descrambled bit errors will cause widely separated bit errors so that, for the most part, each error bit will be in a separate data bit sequence which is the subject of a separate parity bit calculation. At the receive end of the link, received signals are descrambled, resequenced back to their original order and then demultiplexed to respective outputs.

REFERENCES:
patent: 3872257 (1975-03-01), Bleickardt et al.
patent: 4352129 (1982-09-01), Baldwin
patent: 4471164 (1984-09-01), Henry
patent: 4568915 (1986-02-01), Gutleber
patent: 4827513 (1989-05-01), Austin
patent: 4975952 (1990-12-01), Mabey
patent: 5144304 (1992-09-01), McMahon et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Pre-scramble encoding method and apparatus for digital communica does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pre-scramble encoding method and apparatus for digital communica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pre-scramble encoding method and apparatus for digital communica will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1573500

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.