B3ZS (North American T3)
At the North American T3 rate (44.736 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 "00V" or "B0V". The choice is made to ensure that consecutive violations are of differing polarity, i.e. separated by an odd number of normal B marks.
| Number of B bits since last V |
Pattern | Polarity of last B |
Coded |
|---|---|---|---|
| odd | 00V | + | 00+ |
| − | 00− | ||
| even | B0V | + | −0− |
| − | +0+ |
Read more about this topic: Modified AMI Code
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