<s>
VME	B-Architecture
eXtensions	I-Architecture
for	I-Architecture
instrumentation	I-Architecture
bus	O
(	O
VXI	B-Architecture
bus	O
)	O
refers	O
to	O
standards	O
for	O
automated	B-Application
test	I-Application
based	O
upon	O
VMEbus	B-Architecture
.	O
</s>
<s>
VXI	B-Architecture
defines	O
additional	O
bus	O
lines	O
for	O
timing	O
and	O
triggering	O
as	O
well	O
as	O
mechanical	O
requirements	O
and	O
standard	O
protocols	O
for	O
configuration	O
,	O
message-based	O
communication	O
,	O
multi-chassis	O
extension	O
,	O
and	O
other	O
features	O
.	O
</s>
<s>
In	O
2004	O
,	O
the	O
2eVME	O
extension	O
was	O
added	O
to	O
the	O
VXI	B-Architecture
bus	O
specification	O
,	O
giving	O
it	O
a	O
maximum	O
data	O
rate	O
of	O
160	O
MB/s	O
.	O
</s>
<s>
The	O
basic	O
building	O
block	O
of	O
a	O
VXI	B-Architecture
system	O
is	O
the	O
mainframe	O
or	O
chassis	O
.	O
</s>
<s>
Instruments	O
in	O
the	O
form	O
of	O
VXI	B-Architecture
Modules	O
then	O
fit	O
the	O
slots	O
in	O
the	O
rack	O
.	O
</s>
<s>
VXI	B-Architecture
bus	O
modules	O
are	O
typically	O
6U	O
in	O
height	O
(	O
see	O
Eurocard	O
)	O
and	O
C-size	O
(	O
unlike	O
VME	B-Architecture
bus	I-Architecture
modules	O
which	O
are	O
more	O
commonly	O
B-size	O
)	O
.	O
</s>
<s>
This	O
patent	O
was	O
freely	O
licensed	O
by	O
Tektronix	O
to	O
the	O
VXIbus	B-Architecture
Consortium	O
.	O
</s>
<s>
The	O
VXIbus	B-Architecture
grew	O
from	O
the	O
VME	B-Architecture
bus	I-Architecture
specification	O
,	O
it	O
was	O
established	O
in	O
1987	O
by	O
Hewlett	O
Packard	O
(	O
now	O
Keysight	O
Technologies	O
)	O
,	O
Racal	O
Instruments	O
(	O
now	O
Astronics	O
Test	O
Systems	O
)	O
,	O
Colorado	O
Data	O
Systems	O
,	O
Wavetek	O
and	O
Tektronix	O
.	O
</s>
<s>
VXI	B-Architecture
's	O
core	O
market	O
is	O
in	O
Military	O
and	O
Avionics	O
Automatic	O
Test	O
Systems	O
.	O
</s>
<s>
The	O
VXIplug&play	O
Alliance	O
specified	O
additional	O
hardware	O
and	O
software	O
interoperability	O
standards	O
,	O
such	O
as	O
the	O
Virtual	B-General_Concept
Instrument	I-General_Concept
Software	I-General_Concept
Architecture	I-General_Concept
(	O
VISA	O
)	O
,	O
although	O
the	O
alliance	O
was	O
eventually	O
merged	O
with	O
the	O
.	O
</s>
<s>
Application	O
software	O
that	O
supports	O
VXIplug&play	O
instrument	O
drivers	O
for	O
controlling	O
instruments	O
include	O
LabVIEW	B-Application
and	O
MATLAB	B-Language
.	O
</s>
