<s>
SMC	O
(	O
SubMiniature	O
version	O
C	O
)	O
connectors	O
are	O
coaxial	O
RF	B-Protocol
connectors	I-Protocol
developed	O
in	O
the	O
1960s	O
.	O
</s>
<s>
plug	O
)	O
SMC	B-Protocol
connectors	I-Protocol
have	O
a	O
socket	O
for	O
the	O
center	O
contact	O
,	O
and	O
Female	O
(	O
a.k.a.	O
</s>
<s>
jack	O
)	O
SMC	B-Protocol
connectors	I-Protocol
have	O
a	O
pin	O
for	O
the	O
center	O
contact	O
.	O
</s>
<s>
The	O
term	O
Subvis	B-Protocol
connector	I-Protocol
appears	O
to	O
be	O
European	O
usage	O
;	O
the	O
connectors	O
appear	O
to	O
be	O
electrically	O
and	O
mechanically	O
equivalent	O
to	O
SMC	O
.	O
</s>
