<s>
NDL	O
(	O
Network	B-Device
Definition	I-Device
Language	I-Device
)	O
was	O
a	O
compiler	O
on	O
Burroughs	O
Large	B-Device
and	O
Medium	B-Language
Systems	I-Language
computers	O
used	O
to	O
create	O
a	O
network	O
definition	O
file	O
for	O
a	O
data	O
communications	O
controller	O
(	O
DCC	O
)	O
and	O
object	O
code	O
for	O
a	O
data	O
communications	O
processor	O
(	O
DCP	O
)	O
that	O
interfaced	O
between	O
a	O
message	O
control	O
program	O
(	O
written	O
in	O
DCALGOL	O
)	O
such	O
as	O
(	O
RJE	B-Protocol
)	O
,	O
(	O
MCSII	O
)	O
or	O
(	O
CANDE	B-Operating_System
)	O
and	O
the	O
computer	O
's	O
line	O
adaptors	O
and	O
terminal	O
network	O
.	O
</s>
<s>
Burroughs	O
Network	B-Device
Definition	I-Device
Language	I-Device
allowed	O
many	O
parameters	O
of	O
the	O
mainframe	O
communications	O
adapter	O
,	O
modems	O
(	O
where	O
used	O
)	O
,	O
protocol	O
and	O
attached	O
terminal	O
to	O
be	O
defined	O
.	O
</s>
<s>
However	O
it	O
treated	O
the	O
low-level	O
operation	O
of	O
the	O
multi-drop	B-General_Concept
protocol	I-General_Concept
,	O
including	O
the	O
modulus	O
of	O
sequence	O
numbers	O
and	O
the	O
algorithm	O
used	O
for	O
CRCs	O
etc	O
.	O
</s>
