<s>
OCARI	B-Device
(	O
Open	O
Communication	O
protocol	O
for	O
Ad	O
hoc	O
Reliable	O
industrial	O
Instrumentation	O
)	O
is	O
a	O
low-rate	O
wireless	O
personal	O
area	O
networks	O
(	O
LR-WPAN	O
)	O
communication	O
protocol	O
that	O
derives	O
from	O
the	O
IEEE	O
802.15.4	O
standard	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
the	O
following	O
consortium	O
during	O
the	O
OCARI	B-Device
project	O
that	O
is	O
funded	O
by	O
the	O
French	O
National	O
Research	O
Agency	O
(	O
ANR	O
)	O
:	O
</s>
<s>
Since	O
the	O
end	O
of	O
the	O
Agency	O
project	O
,	O
EDF	O
and	O
INRIA	O
continued	O
to	O
work	O
together	O
with	O
BeamLogic	O
to	O
industrialize	O
OCARI	B-Device
.	O
</s>
<s>
OCARI	B-Device
was	O
designed	O
to	O
satisfy	O
the	O
following	O
technical	O
requirements	O
:	O
</s>
<s>
OCARI	B-Device
distinguishes	O
from	O
protocols	O
such	O
as	O
Zigbee	B-Protocol
,	O
WirelessHART	B-Device
and	O
Isa100.11a	B-Device
by	O
the	O
following	O
characteristics	O
:	O
</s>
<s>
Distributed	O
synchronization	O
of	O
the	O
operating	O
cycle	O
based	O
on	O
multi-hop	B-General_Concept
deterministic	O
synchronization	O
of	O
nodes	O
using	O
cascaded	O
beacons	O
.	O
</s>
<s>
The	O
operating	O
cycle	O
of	O
OCARI	B-Device
is	O
divided	O
into	O
five	O
periods	O
:	O
</s>
<s>
 [ T0-T1 ] 	O
:	O
Multi-hop	B-General_Concept
deterministic	O
synchronization	O
of	O
nodes	O
using	O
cascaded	O
beacons	O
.	O
</s>
<s>
The	O
topology	O
of	O
an	O
OCARI	B-Device
network	O
is	O
organized	O
as	O
follows	O
:	O
</s>
<s>
OCARI	B-Device
was	O
developed	O
to	O
satisfy	O
the	O
user	O
needs	O
in	O
constraint	O
environments	O
that	O
are	O
founded	O
in	O
Power	O
Plants	O
and	O
in	O
Warships	O
.	O
</s>
<s>
Typical	O
applications	O
of	O
OCARI	B-Device
are	O
:	O
</s>
