<s>
Ethernet	B-Protocol
Powerlink	I-Protocol
is	O
a	O
real-time	B-General_Concept
protocol	O
for	O
standard	O
Ethernet	O
.	O
</s>
<s>
It	O
is	O
an	O
open	O
protocol	O
managed	O
by	O
the	O
Ethernet	B-Protocol
POWERLINK	I-Protocol
Standardization	O
Group	O
(	O
EPSG	O
)	O
.	O
</s>
<s>
This	O
protocol	O
has	O
nothing	O
to	O
do	O
with	O
power	O
distribution	O
via	O
Ethernet	O
cabling	O
or	O
power	B-Device
over	I-Device
Ethernet	I-Device
(	O
PoE	B-Device
)	O
,	O
power	B-Device
line	I-Device
communication	I-Device
,	O
or	O
Bang	O
&	O
Olufsen	O
's	O
PowerLink	O
cable	O
.	O
</s>
<s>
Ethernet	B-Protocol
Powerlink	I-Protocol
expands	O
Ethernet	O
with	O
a	O
mixed	O
polling	O
and	O
timeslicing	O
mechanism	O
.	O
</s>
<s>
Powerlink	O
was	O
standardized	O
by	O
the	O
Ethernet	B-Protocol
Powerlink	I-Protocol
Standardization	O
Group	O
(	O
EPSG	O
)	O
and	O
founded	O
in	O
June	O
2003	O
as	O
an	O
independent	O
association	O
.	O
</s>
<s>
The	O
original	O
physical	O
layer	O
specified	O
was	O
100BASE-TX	B-Protocol
Fast	B-Protocol
Ethernet	I-Protocol
.	O
</s>
<s>
Since	O
the	O
end	O
of	O
2006	O
,	O
Ethernet	B-Protocol
Powerlink	I-Protocol
with	O
Gigabit	O
Ethernet	O
supported	O
a	O
transmission	O
rate	O
ten	O
times	O
higher	O
(	O
1,000	O
Mbit/s	O
)	O
.	O
</s>
<s>
Repeating	O
hubs	O
instead	O
of	O
switches	O
within	O
the	O
Real-time	B-General_Concept
domain	O
is	O
recommended	O
to	O
minimise	O
delay	O
and	O
jitter	O
.	O
</s>
<s>
Ethernet	B-Protocol
Powerlink	I-Protocol
uses	O
IAONA	O
's	O
Industrial	O
Ethernet	O
Planning	O
and	O
Installation	O
Guide	O
for	O
clean	O
cabling	O
of	O
industrial	O
networks	O
and	O
both	O
industrial	O
Ethernet	O
connectors	O
8P8C	O
(	O
commonly	O
known	O
as	O
RJ45	O
)	O
and	O
M12	O
are	O
accepted	O
.	O
</s>
<s>
The	O
standard	O
Ethernet	O
data	B-Protocol
link	I-Protocol
layer	I-Protocol
is	O
extended	O
by	O
an	O
additional	O
bus	O
scheduling	O
mechanism	O
,	O
which	O
secures	O
that	O
at	O
a	O
time	O
only	O
one	O
node	O
is	O
accessing	O
the	O
network	O
.	O
</s>
<s>
The	O
CSMA/CD	O
mechanism	O
of	O
non-switched	O
Ethernet	O
,	O
which	O
caused	O
non-deterministic	O
Ethernet	O
behaviour	O
,	O
is	O
avoided	O
by	O
the	O
Ethernet	B-Protocol
Powerlink	I-Protocol
scheduling	O
mechanism	O
.	O
</s>
<s>
After	O
system	O
start-up	O
is	O
finished	O
,	O
the	O
Real-Time	B-General_Concept
domain	O
is	O
operating	O
under	O
Real-Time	B-General_Concept
conditions	O
.	O
</s>
<s>
The	O
quality	O
of	O
the	O
Real-Time	B-General_Concept
behavior	O
depends	O
on	O
the	O
precision	O
of	O
the	O
overall	O
basic	O
cycle	O
time	O
.	O
</s>
<s>
OpenSAFETY	B-Protocol
allows	O
both	O
publish/subscriber	O
and	O
client/server	O
communication	O
.	O
</s>
<s>
OpenSAFETY	B-Protocol
is	O
in	O
conformance	O
with	O
IEC	O
61508	O
.	O
</s>
