Alignment of bytes in a digital data bit stream

Details Alignment of bytes in a digital data bit stream Alignment of bytes in a digital data bit stream

H - Electricity

04

J

363/22

H04J 3/12 (2006.01) H04L 7/08 (2006.01) H04L 25/03 (2006.01)

Patent

CA 1061483

ALIGNMENT OF BYTES IN A DIGITAL DATA BIT STREAM Abstract of the Disclosure A sequence of data bytes, which includes a low signaling rate control signal inserted in the framing bit position of each byte, is prepared for transmission by scrambling the information bits while maintaining the framing bit position unscrambled. Pairs of bits occupying a corresponding bit position in different bytes are compared at the receiver and comparison mismatches are counted. The framing bit position is identified by bits having a rate of change in their binary condition which does not exceed a predetermined count rate which is in excess of the low signaling rate of the control signal and is less than the anticipated rate of change of the scrambled information bits. The receiver, when aligned with the framing bit position, is enabled to recover the control signal and unscramble the information bits.

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