Editing 8b/10b encoding (section)

==== 3b/4b code (fghj) ====
{| class="wikitable" style="text-align:center; border-width:0;"
!colspan="2"| Input !! <small>RD = −1</small> !! <small>RD = +1</small>
|rowspan="11" style="text-align:center; background:#FFFFFF; border-width:0;"|
!colspan="2"| Input !! <small>RD = −1</small> !! <small>RD = +1</small>
|-
!  Code          !! HGF !! colspan="2" | f&nbsp;g&nbsp;h&nbsp;j  !! Code                     !! HGF !! colspan="2" | f&nbsp;g&nbsp;h&nbsp;j
|-
|align="left"| D.x.0    || 000 || 1011   || 0100  || align="left" style="background:#EEEEFF;" | K.x.0   || 000 || 1011   || 0100
|-
|align="left"| D.x.1    || 001 ||colspan=2| 1001 ||align="left" style="background:#EEEEFF;" | K.x.1 ‡ || 001 || '''0'''110   || '''1'''001
|-
|align="left"| D.x.2    || 010 ||colspan=2| 0101 ||align="left" style="background:#EEEEFF;" | K.x.2   || 010 || 1010   || 0101
|-
|align="left"| D.x.3    || 011 || 1100   || 0011 || align="left" style="background:#EEEEFF;" | K.x.3   || 011 || 1100   || 0011
|-
|align="left"| D.x.4    || 100 || 1101   || 0010 || align="left" style="background:#EEEEFF;" | K.x.4   || 100 || 1101   || 0010
|-
|align="left"| D.x.5    || 101 ||colspan=2| 1010 ||align="left" style="background:#EEEEFF;" | K.x.5 ‡ || 101 || '''0'''101   || '''1'''010
|-
|align="left"| D.x.6    || 110 ||colspan=2| 0110 ||align="left" style="background:#EEEEFF;" | K.x.6   || 110 || 1001   || 0110
|-
|align="left"| D.x.P7 † || rowspan="2" | 111 || 1110   || 0001 || align="left" style="background:#EEEEFF;" | K.x.7 ‡ || 111 || '''0'''111   || '''1'''000
|-
|align="left"| D.x.A7 † ||                      0111   || 1000 || colspan="4" style="background:#FFFFFF; border-width:0;" |
|}

† For D.x.7, either the Primary (D.x.P7), or the Alternate (D.x.A7) encoding must be selected in order to avoid a run of five consecutive 0s or 1s when combined with the preceding 5b/6b code.<br>Sequences of exactly five identical bits are used in comma symbols for synchronization issues.<br> D.x.A7 is used only 
* when RD&nbsp;=&nbsp;−1: for ''x''&nbsp;=&nbsp;17, 18 and 20  and 
* when RD&nbsp;=&nbsp;+1: for ''x''&nbsp;=&nbsp;11, 13 and 14.
With ''x''&nbsp;=&nbsp;23, ''x''&nbsp;=&nbsp;27, ''x''&nbsp;=&nbsp;29, and ''x''&nbsp;=&nbsp;30, the 3b/4b code portion used for control symbols K.x.7 is the same as that for D.x.A7.<br>Any other D.x.A7 code can't be used as it would result in chances for misaligned comma sequences.

‡ Only K.28.1, K.28.5, and K.28.7 generate comma symbols, that contain a bit sequence of five 0s or 1s.<br>The symbol has the format 11'''0000&nbsp;0'''1xx or 00'''1111&nbsp;1'''0xx.