<s>
The	O
X2	B-Device
transceiver	I-Device
format	O
is	O
a	O
10	O
gigabit	O
per	O
second	O
modular	O
fiber	O
optic	O
interface	O
intended	O
for	O
use	O
in	O
routers	O
,	O
switches	O
and	O
optical	O
transport	O
platforms	O
.	O
</s>
<s>
It	O
is	O
an	O
early	O
generation	O
10	O
gigabit	O
interface	O
related	O
to	O
the	O
similar	O
XENPAK	B-Protocol
and	I-Protocol
XPAK	I-Protocol
formats	O
.	O
</s>
<s>
X2	O
may	O
be	O
used	O
with	O
10	O
gigabit	O
ethernet	O
or	O
OC-192/STM	O
-64	O
speed	O
SDH/SONET	B-Protocol
equipment	O
.	O
</s>
<s>
X2	O
modules	O
are	O
smaller	O
and	O
consume	O
less	O
power	O
than	O
first	O
generation	O
XENPAK	B-Protocol
modules	O
,	O
but	O
larger	O
and	O
consume	O
more	O
energy	O
than	O
the	O
newer	O
XFP	B-Protocol
transceiver	I-Protocol
standard	O
and	O
SFP+	B-Protocol
standards	O
.	O
</s>
<s>
As	O
of	O
2016	O
this	O
format	O
is	O
relatively	O
uncommon	O
and	O
has	O
been	O
replaced	O
by	O
10Gbit/s	O
SFP+	B-Protocol
in	O
most	O
new	O
equipment	O
.	O
</s>
