<s>
Category	O
3	O
cable	O
,	O
commonly	O
known	O
as	O
or	O
station	B-Protocol
wire	I-Protocol
,	O
and	O
less	O
commonly	O
known	O
as	O
VG	O
or	O
voice-grade	O
(	O
as	O
,	O
for	O
example	O
,	O
in	O
100BaseVG	B-Protocol
)	O
,	O
is	O
an	O
unshielded	O
twisted	O
pair	O
(	O
UTP	O
)	O
cable	O
used	O
in	O
telephone	O
wiring	O
.	O
</s>
<s>
Although	O
designed	O
to	O
reliably	O
carry	O
data	O
up	O
to	O
10Mbit/s	O
,	O
modern	O
data	B-Architecture
networks	I-Architecture
run	O
at	O
much	O
higher	O
speeds	O
,	O
and	O
or	O
better	O
cable	O
is	O
generally	O
used	O
for	O
new	O
installations	O
.	O
</s>
<s>
Cat	B-Protocol
3	I-Protocol
cables	I-Protocol
may	O
have	O
2	O
,	O
3	O
or	O
4	O
pairs	O
.	O
</s>
<s>
was	O
widely	O
used	O
in	O
computer	B-Architecture
networking	I-Architecture
in	O
the	O
early	O
1990s	O
for	O
10BASE-T	B-Protocol
Ethernet	O
and	O
,	O
to	O
a	O
much	O
lesser	O
extent	O
,	O
for	O
100BaseVG	B-Protocol
Ethernet	O
,	O
Token	B-Device
Ring	I-Device
and	O
100BASE-T4	O
.	O
</s>
<s>
The	O
original	O
Power	B-Device
over	I-Device
Ethernet	I-Device
802.3af	B-Device
specification	O
supports	O
the	O
use	O
of	O
cable	O
,	O
but	O
the	O
later	O
802.3at	B-Device
Type	I-Device
2	I-Device
high-power	O
variation	O
does	O
not	O
.	O
</s>
<s>
In	O
some	O
use	O
cases	O
and	O
for	O
short	O
distances	O
,	O
Cat	O
3	O
may	O
be	O
capable	O
of	O
carrying	O
100BASE-TX	B-Protocol
(	O
2	O
pairs	O
)	O
or	O
even	O
1000BASE-T	O
(	O
4	O
pairs	O
)	O
.	O
</s>
<s>
Dedicated	O
100BASE-T4	O
networks	O
,	O
supporting	O
100Mbit/s	O
over	O
Cat	O
3	O
,	O
appear	O
to	O
have	O
been	O
a	O
rarity	O
as	O
very	O
few	O
network	B-Protocol
interface	I-Protocol
controllers	I-Protocol
and	O
switches	O
were	O
ever	O
released	O
.	O
</s>
<s>
Some	O
examples	O
include	O
the	O
3com	O
3C250-T4	O
Superstack	O
II	O
HUB	O
100	O
,	O
IBM	O
8225	O
Fast	B-Protocol
Ethernet	I-Protocol
Stackable	O
Hub	O
and	O
Intel	O
LinkBuilder	O
FMS	O
100	O
T4	O
.	O
</s>
<s>
The	O
same	O
applies	O
to	O
network	B-Protocol
interface	I-Protocol
controller	I-Protocol
cards	O
.	O
</s>
<s>
Bridging	O
100BASE-T4	O
with	O
100BASE-TX	B-Protocol
required	O
additional	O
network	O
equipment	O
.	O
</s>
<s>
Starting	O
in	O
the	O
mid-1990s	O
,	O
new	O
structured	O
cabling	O
installations	O
were	O
often	O
built	O
with	O
the	O
higher	O
performing	O
cable	O
required	O
by	O
100BASE-TX	B-Protocol
.	O
</s>
