<s>
Digital	B-Protocol
Data	I-Protocol
Communications	I-Protocol
Message	I-Protocol
Protocol	I-Protocol
(	O
DDCMP	B-Protocol
)	O
is	O
a	O
byte-oriented	O
communications	O
protocol	O
devised	O
by	O
Digital	O
Equipment	O
Corporation	O
in	O
1974	O
to	O
allow	O
communication	O
over	O
point-to-point	O
network	O
links	O
for	O
the	O
company	O
's	O
DECnet	B-Protocol
Phase	O
I	O
network	O
protocol	O
suite	O
.	O
</s>
<s>
It	O
was	O
retained	O
and	O
extended	O
for	O
later	O
versions	O
of	O
the	O
DECnet	B-Protocol
protocol	O
suite	O
.	O
</s>
<s>
DDCMP	B-Protocol
has	O
been	O
described	O
as	O
the	O
"	O
most	O
popular	O
and	O
pervasive	O
of	O
the	O
commercial	O
byte-count	O
data	O
link	O
protocols	O
"	O
.	O
</s>
