HDB3
HDB3 (High Density Bipolar of order 3 code) is a telecommunications line code mainly used in Japan, Europe and Australia (for example, in E-1 lines) and is based on AMI. It is also very similar to the B8ZS encoding used in T-1 lines.
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High density bipolar 3 zeros HDB3 digital signaling
No, E1's use HDB3 instead. HDB3 stands for High Density Bipolar of order 3. In principle, it works in a similar way to B8ZS coding, but substitutes specific bipolar violation patterns to replace any instance of 4 consecutive zero bits (whereas B8ZS uses a specific BPV pattern in place of a frame containing 8 zeros).
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There are a number of different encoding methods used on T1 lines. Alternate Mark Inversion (AMI), Bipolar With 8-Bit Substitution (B8ZS), and High Density Bipolar Three Code (HDB3).