<s>
The	O
10	O
Gbit/s	O
Ethernet	O
Passive	B-Architecture
Optical	I-Architecture
Network	I-Architecture
standard	O
,	O
better	O
known	O
as	O
10G-EPON	B-Protocol
allows	O
computer	B-Architecture
network	I-Architecture
connections	O
over	O
telecommunication	O
provider	O
infrastructure	O
.	O
</s>
<s>
It	O
was	O
ratified	O
as	O
IEEE	O
802.3av	B-Protocol
standard	O
in	O
2009	O
.	O
</s>
<s>
EPON	O
is	O
a	O
type	O
of	O
passive	B-Architecture
optical	I-Architecture
network	I-Architecture
,	O
which	O
is	O
a	O
point-to-multipoint	O
network	O
using	O
passive	O
fiber-optic	B-Protocol
splitters	I-Protocol
rather	O
than	O
powered	O
devices	O
for	O
fan-out	O
from	O
hub	O
to	O
customers	O
.	O
</s>
<s>
The	O
Ethernet	B-Protocol
in	I-Protocol
the	I-Protocol
first	I-Protocol
mile	I-Protocol
task	O
force	O
of	O
the	O
Institute	O
of	O
Electrical	O
and	O
Electronics	O
Engineers	O
(	O
IEEE	O
)	O
802.3	O
standards	O
committee	O
published	O
standards	O
that	O
included	O
a	O
passive	B-Architecture
optical	I-Architecture
network	I-Architecture
(	O
PON	O
)	O
variant	O
in	O
2004	O
.	O
</s>
<s>
In	O
March	O
2006	O
,	O
the	O
IEEE	O
802.3	O
held	O
a	O
call	O
for	O
interest	O
for	O
a	O
10	O
Gbit/s	O
Ethernet	B-Architecture
PON	I-Architecture
study	O
group	O
.	O
</s>
<s>
By	O
September	O
2006	O
,	O
IEEE	O
802.3	O
formed	O
the	O
802.3av	B-Protocol
10G-EPON	B-Protocol
Task	O
Force	O
to	O
produce	O
a	O
draft	O
standard	O
.	O
</s>
<s>
In	O
September	O
2009	O
,	O
the	O
IEEE	O
802	O
Plenary	O
ratified	O
an	O
amendment	O
to	O
802.3	O
to	O
publish	O
802.3av	B-Protocol
amendment	O
as	O
the	O
standard	O
IEEE	O
Std	O
802.3av-2009	O
.	O
</s>
<s>
Date	O
Milestone	O
September	O
2006	O
IEEE	O
802.3av	B-Protocol
task	O
force	O
was	O
formed	O
and	O
met	O
in	O
Knoxville	O
,	O
Tennessee	O
.	O
</s>
<s>
The	O
work	O
on	O
the	O
10G-EPON	B-Protocol
was	O
continued	O
by	O
the	O
IEEE	O
P802.3bk	O
Extended	O
EPON	O
Task	O
Force	O
,	O
formed	O
in	O
March	O
2012	O
.	O
</s>
<s>
The	O
major	O
goals	O
for	O
this	O
Task	O
Force	O
included	O
adding	O
support	O
for	O
PX30	O
,	O
PX40	O
,	O
PRX40	O
,	O
and	O
PR40	O
power	O
budget	O
classes	O
to	O
both	O
1G-EPON	O
and	O
10G-EPON	B-Protocol
.	O
</s>
<s>
Symmetric-rate	O
10/10G	O
-EPON	O
supports	O
both	O
transmit	O
and	O
receive	O
data	O
paths	O
operating	O
at	O
10	O
Gbit/s	O
.	O
</s>
<s>
The	O
main	O
driver	O
for	O
10/10G	O
-EPON	O
was	O
to	O
provide	O
adequate	O
downstream	O
and	O
upstream	O
bandwidth	O
to	O
support	O
multi-family	O
residential	O
building	O
(	O
known	O
in	O
the	O
standard	O
as	O
Multi	O
Dwelling	O
Unit	O
or	O
MDU	O
)	O
customers	O
.	O
</s>
<s>
The	O
10/10G	O
-EPON	O
employs	O
a	O
number	O
of	O
functions	O
that	O
are	O
common	O
to	O
other	O
point-to-point	O
Ethernet	O
standards	O
.	O
</s>
<s>
The	O
upstream	O
transmission	O
is	O
identical	O
to	O
that	O
of	O
the	O
1G-EPON	O
(	O
as	O
specified	O
in	O
IEEE	O
standard	O
802.3ah	B-Protocol
)	O
,	O
using	O
deployed	O
burst-mode	O
optical	O
transceivers	O
.	O
</s>
<s>
Like	O
all	O
EPON	O
networks	O
,	O
10G-EPON	B-Protocol
transmits	O
data	O
in	O
variable-length	O
packets	O
up	O
to	O
1518	O
bytes	O
,	O
as	O
specified	O
in	O
the	O
IEEE	O
802.3	O
standard	O
.	O
</s>
<s>
These	O
variable-length	O
packets	O
are	O
better	O
suited	O
to	O
IP	O
traffic	O
than	O
the	O
fixed-length	O
,	O
53-byte	O
cells	O
used	O
by	O
other	O
Passive	B-Architecture
Optical	I-Architecture
Networks	I-Architecture
,	O
such	O
as	O
GPON	B-Architecture
.	O
</s>
<s>
This	O
can	O
significantly	O
reduce	O
10G-EPON	B-Protocol
'	O
s	O
overhead	O
in	O
comparison	O
to	O
other	O
systems	O
.	O
</s>
<s>
Typical	O
10G-EPON	B-Protocol
overhead	O
is	O
approximately	O
7.42	O
%	O
.	O
</s>
<s>
Typical	O
GPON	B-Architecture
overhead	O
is	O
13.22	O
%	O
.	O
</s>
<s>
The	O
802.3av	B-Protocol
defines	O
several	O
power	O
budgets	O
,	O
denoted	O
either	O
PR	O
or	O
PRX	O
.	O
</s>
<s>
The	O
802.3av	B-Protocol
draft	O
standard	O
defines	O
the	O
following	O
power	O
budgets	O
:	O
</s>
<s>
The	O
802.3bk	O
added	O
support	O
for	O
a	O
new	O
10/10G	O
-EPON	O
and	O
10/1G	O
-EPON	O
power	O
class	O
for	O
PR	O
or	O
PRX	O
PMDs	O
,	O
respectively	O
,	O
as	O
shown	O
below	O
:	O
</s>
<s>
The	O
10G-EPON	B-Protocol
employs	O
a	O
stream-based	O
forward	B-Error_Name
error	I-Error_Name
correction	I-Error_Name
(	O
FEC	O
)	O
mechanism	O
based	O
on	O
Reed-Solomon(255, 223 )	O
.	O
</s>
<s>
Upstream	O
channel	O
in	O
the	O
asymmetric	O
EPON	O
is	O
the	O
same	O
as	O
in	O
1	O
Gbit/s	O
EPON	O
,	O
an	O
optional	O
frame-based	O
FEC	O
using	O
Reed-Solomon(255, 239 )	O
.	O
</s>
<s>
10G-EPON	B-Protocol
uses	O
64B/66B	O
line	O
coding	O
,	O
thus	O
encoding	O
overhead	O
is	O
just	O
3.125	O
%	O
compared	O
to	O
25%	O
encoding	O
overhead	O
that	O
1G-EPON	O
has	O
due	O
to	O
its	O
use	O
of	O
8b/10b	B-Protocol
encoding	I-Protocol
.	O
</s>
<s>
The	O
usable	O
bandwidth	O
in	O
10G-EPON	B-Protocol
is	O
10	O
Gbit/s	O
out	O
of	O
a	O
raw	O
bandwidth	O
of	O
10.3125	O
Gbit/s	O
.	O
</s>
<s>
The	O
10G-EPON	B-Protocol
standard	O
defines	O
a	O
new	O
physical	O
layer	O
,	O
keeping	O
the	O
MAC	O
,	O
MAC	O
Control	O
and	O
all	O
the	O
layers	O
above	O
unchanged	O
to	O
the	O
greatest	O
extent	O
possible	O
.	O
</s>
<s>
This	O
means	O
that	O
users	O
of	O
10G-EPON	B-Protocol
can	O
expect	O
backward	O
compatibility	O
of	O
network	O
management	O
system	O
(	O
NMS	O
)	O
,	O
PON-layer	O
operations	O
,	O
administrations	O
,	O
and	O
maintenance	O
(	O
OAM	O
)	O
system	O
,	O
DBA	O
and	O
scheduling	O
,	O
and	O
so	O
on	O
.	O
</s>
<s>
The	O
802.3av	B-Protocol
standard	O
places	O
significant	O
emphasis	O
on	O
enabling	O
simultaneous	O
operation	O
of	O
1	O
Gbit/s	O
and	O
10	O
Gbit/s	O
EPON	O
systems	O
on	O
the	O
same	O
outside	O
plant	O
.	O
</s>
