<s>
Physical	B-Protocol
medium	I-Protocol
dependent	I-Protocol
sublayers	O
or	O
PMDs	O
further	O
help	O
to	O
define	O
the	O
physical	B-Application
layer	I-Application
of	O
computer	B-Architecture
network	I-Architecture
protocols	O
.	O
</s>
<s>
Common	O
examples	O
are	O
specifications	O
for	O
Fast	B-Protocol
Ethernet	I-Protocol
,	O
Gigabit	O
Ethernet	O
and	O
10	O
Gigabit	O
Ethernet	O
defined	O
by	O
the	O
Institute	O
of	O
Electrical	O
and	O
Electronics	O
Engineers	O
(	O
IEEE	O
)	O
.	O
</s>
<s>
For	O
cable	B-Device
modems	I-Device
physical	B-Protocol
medium	I-Protocol
dependent	I-Protocol
sublayers	O
define	O
the	O
physical	O
sub-layer	O
.	O
</s>
<s>
The	O
Ethernet	O
PMD	O
sublayer	O
is	O
part	O
of	O
the	O
Ethernet	B-Protocol
physical	I-Protocol
layer	I-Protocol
(	O
PHY	O
)	O
.	O
</s>
<s>
10GBASE-E	O
has	O
been	O
defined	O
for	O
single	B-Device
mode	I-Device
fiber	I-Device
operation	O
only	O
.	O
</s>
<s>
10GBASE-L	O
was	O
also	O
defined	O
for	O
single	B-Device
mode	I-Device
fiber	I-Device
operations	O
,	O
uses	O
the	O
1300nm	O
band	O
allowing	O
it	O
to	O
reach	O
up	O
to	O
10km	O
.	O
</s>
<s>
10GBASE-S	O
was	O
defined	O
for	O
use	O
in	O
multimode	B-Device
fiber	I-Device
and	O
ultimately	O
costs	O
less	O
than	O
the	O
other	O
10GbE	O
standards	O
.	O
</s>
<s>
In	O
newer	O
optimized	O
multimode	B-Device
fibers	I-Device
(	O
a.k.a.	O
</s>
<s>
The	O
receiver	O
is	O
arranged	O
in	O
a	O
wavelength-division	O
multiplexing	B-Protocol
manner	O
.	O
</s>
<s>
On	O
legacy	O
FDDI	O
multimode	B-Device
fiber	I-Device
it	O
can	O
reach	O
up	O
to	O
300	O
m	O
while	O
on	O
single	B-Device
mode	I-Device
fiber	I-Device
it	O
can	O
reach	O
up	O
to	O
10km	O
.	O
</s>
<s>
After	O
these	O
specifications	O
have	O
been	O
laid	O
out	O
,	O
they	O
are	O
then	O
completed	O
with	O
local	B-General_Concept
area	I-General_Concept
network	I-General_Concept
and	O
wide	O
area	O
network	O
specifications	O
using	O
different	O
Physical	B-Protocol
Coding	I-Protocol
Sublayer	I-Protocol
standards	O
.	O
</s>
