<s>
In	O
telecommunications	O
,	O
the	O
hybrid	O
(	O
H	O
-	O
)	O
ternary	O
line	B-Protocol
code	I-Protocol
is	O
a	O
line	B-Protocol
code	I-Protocol
that	O
operates	O
on	O
a	O
hybrid	O
principle	O
combining	O
the	O
binary	O
non-return-to-zero-level	O
(	O
NRZL	O
)	O
and	O
the	O
polar	O
return-to-zero	B-Protocol
(	O
RZ	O
)	O
codes	O
.	O
</s>
<s>
The	O
state	O
of	O
the	O
line	B-Protocol
code	I-Protocol
could	O
be	O
in	O
any	O
one	O
of	O
these	O
three	O
states	O
.	O
</s>
<s>
NRZ-L	O
and	O
polar	O
RZ	O
codes	O
have	O
deficiencies	O
compared	O
to	O
the	O
proposed	O
H-ternary	O
encoding	B-Protocol
scheme	I-Protocol
.	O
</s>
<s>
Other	O
ternary	O
line	B-Protocol
code	I-Protocol
such	O
as	O
alternate	O
mark	O
inversion	O
(	O
AMI	O
)	O
also	O
lacks	O
the	O
timing	O
information	O
when	O
a	O
run	O
of	O
zeros	O
needs	O
to	O
be	O
transmitted	O
.	O
</s>
<s>
This	O
drawback	O
is	O
partly	O
overcome	O
by	O
its	O
modified	O
version	O
the	O
high	O
density	O
bipolar	O
with	O
three	O
zeros	O
substitution	O
(	O
HDB3	B-Protocol
)	O
.	O
</s>
<s>
On	O
the	O
other	O
hand	O
,	O
the	O
new	O
code	O
has	O
a	O
smaller	O
bandwidth	B-Algorithm
in	O
comparison	O
with	O
the	O
polar	O
RZ	O
code	O
.	O
</s>
