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1
0
0
0
0
0
0
0
0
2.37V
AMI rule
violation
0V
time
AMI rule
violation
-2.37V
Figure 151 HDB3 Line Coding
General rules apply to the substitutions. The particular substitution made is governed by the polarity of the last inserted bit, as
well as the number of pulses following the previous violation bit. If
there is an odd number of pulses, 000V is substituted; the polarity
of V is the same as that of the bit immediately preceding it. If there
is an even number of pulses, B00V is inserted; the polarity of B is
opposite to that of the bit immediately preceding it and the polarity
of V is the same as that of B. Refer to Figure 152 to see the types
of HDB3 zero substitution codes.
Ch.6 Technology Overview
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