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Home > HDB3

HDB3 (High-density bipolar-3 zeros) is a telecommunications line code mainly used in Japan and Europe (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.

Four Zero bits in a row are coded in the following way:

Number of pulses since last replacement
last pulseoddeven
negative000-+00+
positive000+-00-


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HDB3HDB3 H igh d ensity b ipolar 3 zeros) is a telecommunications line code mainly used in Japan and Europe (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. Four Zero bits in a row are coded in t  
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