<s>
The	O
Near-term	B-General_Concept
digital	I-General_Concept
radio	I-General_Concept
(	O
NTDR	B-General_Concept
)	O
program	O
provided	O
a	O
prototype	O
mobile	B-Protocol
ad	I-Protocol
hoc	I-Protocol
network	I-Protocol
(	O
MANET	O
)	O
radio	O
system	O
to	O
the	O
United	O
States	O
Army	O
,	O
starting	O
in	O
the	O
1990s	O
.	O
</s>
<s>
The	O
NTDR	B-General_Concept
protocols	O
consist	O
of	O
two	O
components	O
:	O
clustering	O
and	O
routing	B-Protocol
.	O
</s>
<s>
The	O
cluster	O
heads	O
use	O
a	O
link-state	O
routing	B-Protocol
algorithm	I-Protocol
to	O
maintain	O
the	O
integrity	O
of	O
their	O
backbone	O
and	O
to	O
track	O
the	O
locations	O
of	O
cluster	O
members	O
.	O
</s>
<s>
The	O
NTDR	B-General_Concept
routers	O
also	O
use	O
a	O
variant	O
of	O
Open	B-Protocol
Shortest	I-Protocol
Path	I-Protocol
First	I-Protocol
(	O
OSPF	B-Protocol
)	O
that	O
is	O
called	O
Radio-OSPF	O
(	O
ROSPF	O
)	O
.	O
</s>
<s>
ROSPF	O
does	O
not	O
use	O
the	O
OSPF	B-Protocol
hello	O
protocol	O
for	O
link	O
discovery	O
,	O
etc	O
.	O
</s>
<s>
Instead	O
,	O
OSPF	B-Protocol
adjacencies	O
are	O
created	O
and	O
destroyed	O
as	O
a	O
function	O
of	O
MANET	O
information	O
that	O
is	O
distributed	O
by	O
the	O
NTDR	B-General_Concept
routers	O
,	O
both	O
cluster	O
heads	O
and	O
cluster	O
members	O
.	O
</s>
