<s>
The	O
FC	B-Device
connector	I-Device
is	O
a	O
fiber-optic	B-Device
connector	I-Device
with	O
a	O
threaded	O
body	O
,	O
which	O
was	O
designed	O
for	O
use	O
in	O
high-vibration	O
environments	O
.	O
</s>
<s>
It	O
is	O
commonly	O
used	O
with	O
both	O
single-mode	B-Device
optical	I-Device
fiber	I-Device
and	O
polarization-maintaining	B-Device
optical	I-Device
fiber	I-Device
.	O
</s>
<s>
FC	B-Device
connectors	I-Device
are	O
used	O
in	O
datacom	B-Architecture
,	O
telecommunications	O
,	O
measurement	O
equipment	O
,	O
and	O
single-mode	O
lasers	O
.	O
</s>
<s>
The	O
FC	B-Device
connector	I-Device
has	O
been	O
standardized	O
in	O
TIA	O
fiber	B-Device
optic	I-Device
connector	I-Device
intermateability	O
standard	O
EIA/TIA	O
-604-4	O
.	O
</s>
<s>
The	O
FC	B-Device
connector	I-Device
was	O
originally	O
called	O
a	O
"	O
Field	O
Assembly	O
Connector	O
"	O
by	O
its	O
inventors	O
.	O
</s>
<s>
The	O
name	O
"	O
FC	O
"	O
is	O
an	O
acronym	O
for	O
"	O
ferrule	B-Device
connector	I-Device
"	O
or	O
"	O
fiber	O
channel	O
"	O
.	O
</s>
<s>
Some	O
manufacturers	O
have	O
several	O
grades	O
of	O
polish	O
,	O
for	O
example	O
an	O
FC	B-Device
connector	I-Device
may	O
be	O
designated	O
"	O
FC/PC	O
"	O
(	O
for	O
Physical	O
Contact	O
)	O
,	O
while	O
"	O
FC/SPC	O
"	O
and	O
"	O
FC/UPC	O
"	O
may	O
denote	O
"	O
super	O
"	O
and	O
"	O
ultra	O
"	O
polish	O
qualities	O
,	O
respectively	O
.	O
</s>
<s>
Because	O
of	O
the	O
angle	O
,	O
the	O
reflected	O
light	O
does	O
not	O
stay	O
in	O
the	O
fiber	B-Device
core	I-Device
but	O
instead	O
leaks	O
out	O
into	O
the	O
cladding	O
.	O
</s>
<s>
FC	B-Device
connectors	I-Device
 '	O
floating	O
ferrule	O
provides	O
good	O
mechanical	O
isolation	O
.	O
</s>
<s>
FC	B-Device
connectors	I-Device
need	O
to	O
be	O
mated	O
more	O
carefully	O
than	O
push-pull	O
type	O
connectors	O
due	O
to	O
the	O
need	O
to	O
align	O
the	O
key	O
,	O
and	O
due	O
to	O
the	O
risk	O
of	O
scratching	O
the	O
fiber	O
endface	O
while	O
inserting	O
the	O
ferrule	O
into	O
the	O
jack	O
.	O
</s>
<s>
FC	B-Device
connectors	I-Device
have	O
been	O
replaced	O
in	O
many	O
applications	O
by	O
SC	O
and	O
LC	O
connectors	O
.	O
</s>
<s>
There	O
are	O
four	O
incompatible	O
standards	O
for	O
key	O
widths	O
on	O
FC	B-Device
connectors	I-Device
:	O
one	O
for	O
FC/PC	O
,	O
two	O
for	O
FC/APC	O
,	O
and	O
one	O
that	O
can	O
be	O
used	O
for	O
either	O
.	O
</s>
