<s>
The	O
Fibre	B-Architecture
Channel	I-Architecture
electrical	I-Architecture
interface	I-Architecture
is	O
one	O
of	O
two	O
related	O
Fibre	B-Architecture
Channel	I-Architecture
standards	O
that	O
can	O
be	O
used	O
to	O
physically	O
interconnect	O
computer	O
devices	O
.	O
</s>
<s>
The	O
other	O
standard	O
is	O
a	O
Fibre	B-Application
Channel	I-Application
optical	I-Application
interface	I-Application
,	O
which	O
is	O
not	O
covered	O
in	O
this	O
article	O
.	O
</s>
<s>
Fibre	B-Architecture
channel	I-Architecture
electrical	O
signals	O
are	O
sent	O
over	O
a	O
duplex	O
differential	O
interface	O
.	O
</s>
<s>
The	O
definition	O
of	O
the	O
Fibre	B-Architecture
Channel	I-Architecture
signalling	O
voltage	O
is	O
complex	O
.	O
</s>
<s>
The	O
Bit-Error	O
Rate	O
(	O
BER	O
)	O
objective	O
for	O
Fibre	B-Architecture
Channel	I-Architecture
systems	O
is	O
1	O
in	O
1012	O
(	O
1	O
bit	O
in	O
1,000,000,000,000	O
bits	O
)	O
.	O
</s>
<s>
There	O
are	O
various	O
Fibre	B-Architecture
Channel	I-Architecture
connectors	B-Protocol
in	O
use	O
in	O
the	O
computer	O
industry	O
.	O
</s>
<s>
Details	O
of	O
their	O
pinouts	B-Application
are	O
distributed	O
between	O
different	O
official	O
documents	O
.	O
</s>
<s>
The	O
following	O
sections	O
describe	O
the	O
most	O
common	O
Fibre	B-Architecture
Channel	I-Architecture
pinouts	I-Architecture
with	O
some	O
comments	O
about	O
the	O
purpose	O
of	O
their	O
electrical	O
signals	O
.	O
</s>
<s>
The	O
most	O
familiar	O
Fibre	B-Architecture
Channel	I-Architecture
connectors	B-Protocol
are	O
cable	O
connectors	B-Protocol
,	O
used	O
for	O
interconnects	O
between	O
initiators	B-Device
and	O
targets	B-Device
(	O
usually	O
disk	O
enclosures	O
)	O
.	O
</s>
<s>
There	O
are	O
also	O
"	O
device	O
connectors	B-Protocol
"	O
that	O
can	O
be	O
found	O
on	O
Fibre	B-Architecture
Channel	I-Architecture
disk-drives	O
and	O
backplanes	O
of	O
enclosures	O
.	O
</s>
<s>
The	O
device	O
connectors	B-Protocol
include	O
pins	O
for	O
power	O
and	O
for	O
setting	O
disk	O
options	O
.	O
</s>
<s>
Fibre	B-Architecture
channel	I-Architecture
DE-9	B-Protocol
connectors	I-Protocol
often	O
have	O
only	O
the	O
4	O
required	O
contacts	O
installed	O
.	O
</s>
<s>
the	O
same	O
as	O
used	O
for	O
Token	B-Device
Ring	I-Device
,	O
this	O
is	O
an	O
easy	O
way	O
to	O
tell	O
a	O
fibre	B-Architecture
channel	I-Architecture
cable	O
from	O
an	O
RS-232	O
cable	O
.	O
</s>
<s>
Although	O
SCA-2	B-Architecture
is	O
the	O
official	O
name	O
for	O
this	O
connector	O
,	O
it	O
is	O
often	O
called	O
SCA-40	O
to	O
distinguish	O
it	O
by	O
its	O
pin	O
count	O
from	O
other	O
similar	O
connectors	B-Protocol
.	O
</s>
<s>
Some	O
of	O
the	O
input	O
signals	O
to	O
a	O
Fibre	B-Architecture
Channel	I-Architecture
disk	O
are	O
used	O
to	O
control	O
options	O
,	O
as	O
follows	O
:	O
</s>
