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High Density Bipolar 3-Bit Substitution (HDB3) Glossary
Administration for Network Connectivity
CID: 77730 555-233-504 — Issue 1 — April 2000
476
High Density Bipolar 3-Bit Substitution (HDB3)
HDB3 line coding is similar to Bipolar 8 Zero Substitution (B8ZS) in some
ways. It replaces every 4 consecutive zero in a stream of AMI-encoded data
(see line coding) with either of two sequences. If there has been an even number
of 1s since the last substitution, it substitutes the pattern 1 0 0
BipolarViolation
, where
BipolarViolation
is a 3-volt pulse (a 1) of the
same polarity as the preceding 3-volt pulse. If there has been an odd number of
1s since the last substitution, HDB3 coding substitutes the pattern 0 0 0
BipolarViolation
for the 4-zero string. This system does not corrupt binary
data, and is commonly used with E-1 lines.
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