<s>
Bit-synchronous	B-Protocol
operation	I-Protocol
is	O
a	O
type	O
of	O
digital	O
communication	O
in	O
which	O
the	O
data	O
circuit-terminating	O
equipment	O
(	O
DCE	O
)	O
,	O
data	O
terminal	O
equipment	O
(	O
DTE	O
)	O
,	O
and	O
transmitting	O
circuits	O
are	O
all	O
operated	O
in	O
bit	O
synchronism	B-Application
with	O
a	O
clock	O
signal	O
.	O
</s>
<s>
In	O
bit-synchronous	B-Protocol
operation	I-Protocol
,	O
clock	O
timing	O
is	O
usually	O
delivered	O
at	O
twice	O
the	O
modulation	O
rate	O
,	O
and	O
one	O
bit	O
is	O
transmitted	O
or	O
received	O
during	O
each	O
clock	O
cycle	O
.	O
</s>
<s>
Bit-synchronous	B-Protocol
operation	I-Protocol
is	O
sometimes	O
erroneously	O
referred	O
to	O
as	O
digital	O
synchronization	O
.	O
</s>
