0001 - 45666

Perhaps you mean 4B5B? That's a way to assign combinations of 5 bits to every combination of 4 bits, in such a way that you avoid transmitting long strings of only zeros or only ones. This avoids synchronization problems.

1101 => 11011

1010 => 10110

0011 => 10101

0001 => 01001

1000 => 10010

1001 => 10011 and together: 11011 10110 10101 01001 10010 10011

· 4B3T

· 4B5B

· 2B1Q

· Hamming Code

· 8b/10b encoding

· 64b/66b encoding

· 6b/8b encoding

· 64b/66b encoding

· MPlus used in DVD

· Eight-to-Fourteen Modulation (EFM) used in Compact Disc

· Conditioned Diphase

· Coded mark inversion (CMI)

· EF Carrier Suppressed Return-to-Zero Optical line code.

· Alternate-Phase Return-to-Zero