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
Famous quotes containing the word american:
“All great religions, in order to escape absurdity, have to admit a dilution of agnosticism. It is only the savage, whether of the African bush or the American gospel tent, who pretends to know the will and intent of God exactly and completely.”
—H.L. (Henry Lewis)