<s>
VMEBus	B-Architecture
Switched	O
Serial	O
,	O
commonly	O
known	O
as	O
VXS	B-Architecture
,	O
is	O
an	O
ANSI	O
standard	O
(	O
ANSI/VITA	O
41	O
)	O
that	O
improves	O
the	O
performance	O
of	O
standard	O
parallel	O
VMEbus	B-Architecture
by	O
enhancing	O
it	O
to	O
support	O
newer	O
switched	O
serial	O
fabrics	O
.	O
</s>
<s>
The	O
base	O
specification	O
(	O
ANSI	O
41	O
)	O
defines	O
all	O
common	O
elements	O
of	O
the	O
standard	O
,	O
while	O
"	O
dot	O
"	O
-specifications	O
(	O
ANSI	O
41.n	O
)	O
define	O
extensions	O
which	O
use	O
specific	O
serial	O
fabrics	O
(	O
such	O
as	O
PCI	O
Express	O
,	O
RapidIO	B-General_Concept
,	O
StarFabric	O
from	O
Dolphin	O
Interconnect	O
Solutions	O
and	O
InfiniBand	B-Architecture
)	O
or	O
additional	O
functionality	O
.	O
</s>
<s>
VXS	B-Architecture
is	O
backward	O
compatible	O
with	O
VMEBus	B-Architecture
.	O
</s>
<s>
In	O
common	O
with	O
other	O
similar	O
standards	O
,	O
VXS	B-Architecture
comprises	O
a	O
‘	O
base	O
line’	O
specification	O
,	O
which	O
defines	O
the	O
basic	O
mechanical	O
and	O
electrical	O
elements	O
of	O
VXS	B-Architecture
,	O
together	O
with	O
a	O
series	O
of	O
‘	O
dot	O
level’	O
specifications	O
,	O
one	O
or	O
more	O
of	O
which	O
must	O
be	O
implemented	O
to	O
create	O
a	O
functional	O
module	O
.	O
</s>
