<s>
In	O
telecommunication	O
,	O
coded	B-Protocol
mark	I-Protocol
inversion	I-Protocol
(	O
CMI	O
)	O
is	O
a	O
non-return-to-zero	B-Protocol
(	O
NRZ	B-Protocol
)	O
line	B-Protocol
code	I-Protocol
.	O
</s>
<s>
CMI	O
doubles	O
the	O
bitstream	O
frequency	O
,	O
when	O
compared	O
to	O
its	O
simple	O
NRZ	B-Protocol
equivalent	O
,	O
but	O
allows	O
easy	O
and	O
reliable	O
clock	O
recovery	O
.	O
</s>
