<s>
In	O
telecommunication	O
,	O
Advanced	B-Protocol
Data	I-Protocol
Communication	I-Protocol
Control	I-Protocol
Procedures	I-Protocol
(	O
or	O
Protocol	O
)	O
(	O
ADCCP	B-Protocol
)	O
is	O
a	O
bit-oriented	O
data	B-Protocol
link	I-Protocol
layer	I-Protocol
protocol	O
developed	O
by	O
the	O
American	O
National	O
Standards	O
Institute	O
.	O
</s>
<s>
Although	O
the	O
ISO	O
and	O
ANSI	O
standards	O
writers	O
coordinated	O
their	O
work	O
,	O
so	O
the	O
differences	O
between	O
the	O
standards	O
are	O
mainly	O
editorial	O
,	O
there	O
is	O
one	O
meaningful	O
difference	O
:	O
ADCCP	B-Protocol
's	O
definition	O
of	O
the	O
basic	O
subset	O
required	O
to	O
implement	O
balanced	O
asynchronous	O
mode	O
includes	O
the	O
RSET	O
frame	O
,	O
while	O
HDLC	O
makes	O
it	O
optional	O
.	O
</s>
<s>
Like	O
early	O
versions	O
of	O
HDLC	O
,	O
ADCCP	B-Protocol
specifies	O
a	O
2-byte	O
control	O
field	O
format	O
with	O
the	O
P/F	O
flag	O
duplicated	O
.	O
</s>
