Other T1 Encoding Schemes
For data channels, in order to avoid the need of always setting bit 8 to 1, as described above, other T1 encoding schemes (Modified AMI codes) ensure regular transitions regardless of the data being carried. In this way, data throughput of 64 kbit/s per channel is achieved. B8ZS is a newer format for North America, where HDB3 is the original line coding type used in Europe and Japan.
A very similar encoding scheme, with the logical positions reversed, is also used and is often referred to as pseudoternary encoding. This encoding is otherwise identical.
Read more about this topic: Bipolar Encoding
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