Editing Modified AMI code (section)

==B3ZS (North American T3) <span class="anchor" id="B3ZS"></span>==
At the [[DS-3|North American T3]] rate (44.736&nbsp;Mbit/s), bipolar violations are inserted if 3 or more consecutive zeros occur. This line code is called '''bipolar with three-zero substitution (B3ZS)''', and is very similar to HDB3. Each run of 3 consecutive zeros is replaced by "{{mono|00V}}" or "{{mono|B0V}}". The choice is made to ensure that consecutive violations are of differing polarity, i.e. separated by an odd number of normal {{mono|B}} marks.
{|class=wikitable style="text-align:center;"
|+ B3ZS coding of "000"
! Number of B bits<br/>since last V !! Pattern !! Polarity<br/>of last B !! Coded
|-
|rowspan=2| Odd ||rowspan=2 | 00V
| + || 00+
|-
| − || 00−
|-
|rowspan=2| Even ||rowspan=2 | B0V
| + || −0−
|-
| − || +0+
|}