<s>
Currently	O
known	O
as	O
TIA-530-A	O
,	O
but	O
often	O
called	O
EIA-530	B-Protocol
,	O
or	O
RS-530	B-Protocol
,	O
is	O
a	O
balanced	O
serial	B-Protocol
interface	I-Protocol
standard	O
that	O
generally	O
uses	O
a	O
25-pin	O
connector	O
,	O
originally	O
created	O
by	O
the	O
Telecommunications	O
Industry	O
Association	O
.	O
</s>
