<s>
CoaXPress	B-Device
(	O
CXP	O
)	O
is	O
a	O
digital	O
interface	B-Application
standard	O
developed	O
for	O
high	O
speed	O
image	O
data	O
transmission	O
in	O
machine	B-General_Concept
vision	I-General_Concept
applications	O
.	O
</s>
<s>
The	O
name	O
is	O
a	O
portmanteau	O
of	O
'	O
express	O
 '	O
(	O
as	O
in	O
express	O
train	O
)	O
and	O
'	O
coaxial	O
 '	O
to	O
emphasize	O
CoaXPress	B-Device
is	O
faster	O
than	O
other	O
standards	O
(	O
e.g.	O
</s>
<s>
Camera	B-Protocol
Link	I-Protocol
,	O
or	O
GigE	B-Protocol
Vision	I-Protocol
)	O
and	O
uses	O
75	O
ohm	O
coaxial	O
cables	O
as	O
the	O
physical	O
transmission	O
medium	O
.	O
</s>
<s>
CoaXPress	B-Device
is	O
mostly	O
used	O
in	O
digital	O
imaging	O
applications	O
but	O
it	O
is	O
also	O
suitable	O
for	O
high-speed	O
transmission	O
of	O
universal	O
digital	O
data	O
.	O
</s>
<s>
an	O
industrial	O
digital	B-Device
camera	I-Device
)	O
is	O
connected	O
with	O
one	O
or	O
more	O
coaxial	O
cables	O
to	O
a	O
'	O
host	O
 '	O
that	O
receives	O
the	O
data	O
(	O
e.g.	O
</s>
<s>
a	O
frame	B-Device
grabber	I-Device
board	O
in	O
a	O
computer	O
)	O
.	O
</s>
<s>
The	O
CoaXPress	B-Device
standard	O
1.0	O
and	O
1.1	O
supports	O
bit	O
rates	O
up	O
to	O
6.25	O
Gbit/s	O
per	O
coaxial	O
cable	O
and	O
the	O
new	O
2.0	O
standard	O
supports	O
bit	O
rates	O
up	O
to	O
12.5	O
Gbit/s	O
per	O
coaxial	O
cable	O
from	O
the	O
'	O
device	O
 '	O
to	O
the	O
'	O
host	O
 '	O
.	O
</s>
<s>
Some	O
recent	O
CoaXPress	B-Device
cameras	O
and	O
frame	B-Device
grabbers	I-Device
use	O
8	O
coaxial	O
cables	O
providing	O
a	O
maximum	O
image	O
data	O
rate	O
of	O
about	O
4.8	O
GB/s	O
.	O
</s>
<s>
The	O
older	O
Camera	B-Protocol
Link	I-Protocol
standard	O
can	O
only	O
carry	O
up	O
to	O
850	O
MB/s	O
.	O
</s>
<s>
A	O
CoaXPress	B-Device
'	O
host	O
 '	O
can	O
supply	O
24	O
V	O
over	O
the	O
coaxial	O
cable	O
up	O
to	O
13	O
W	O
per	O
cable	O
.	O
</s>
<s>
The	O
CoaXPress	B-Device
standard	O
requires	O
that	O
both	O
the	O
'	O
device	O
 '	O
and	O
the	O
'	O
host	O
 '	O
support	O
GenICam	B-General_Concept
,	O
a	O
standardized	O
generic	O
programming	O
interface	B-Application
.	O
</s>
<s>
Other	O
than	O
Camera	B-Protocol
Link	I-Protocol
that	O
is	O
built	O
upon	O
pure	O
LVDS	B-Architecture
with	O
no	O
transport	B-Architecture
layer	I-Architecture
,	O
CoaXPress	B-Device
transmits	O
data	O
in	O
packets	B-Protocol
(	O
cf	O
.	O
</s>
<s>
network	B-Protocol
packet	I-Protocol
)	O
using	O
8b/10b	B-Protocol
encoding	I-Protocol
and	O
provides	O
CRC	O
.	O
</s>
<s>
CoaXPress	B-Device
competes	O
with	O
the	O
Camera	B-Protocol
Link	I-Protocol
HS	O
standard	O
by	O
the	O
Automated	O
Imaging	O
Association	O
.	O
</s>
<s>
CoaXPress	B-Device
has	O
been	O
developed	O
by	O
6	O
companies	O
,	O
of	O
whom	O
Adimec	O
,	O
EqcoLogic	O
(	O
today	O
:	O
Microchip	O
)	O
and	O
Active	O
Silicon	O
were	O
among	O
the	O
biggest	O
drivers	O
,	O
in	O
2008	O
.	O
</s>
<s>
The	O
goal	O
was	O
after	O
the	O
failure	O
of	O
Visilink	O
to	O
develop	O
a	O
successor	O
for	O
the	O
Camera	B-Protocol
link	I-Protocol
standard	O
for	O
high-speed	O
and	O
data-rich	O
vision	O
related	O
communication	O
.	O
</s>
<s>
By	O
this	O
time	O
the	O
Japan	O
Industrial	O
Imaging	O
Association	O
has	O
adopted	O
CoaXPress	B-Device
to	O
mature	O
it	O
to	O
an	O
official	O
standard	O
after	O
which	O
the	O
first	O
draft	O
version	O
1.0	O
was	O
presented	O
in	O
December	O
2010	O
.	O
</s>
<s>
The	O
transmission	O
medium	O
for	O
CoaXPress	B-Device
is	O
coaxial	O
cable	O
with	O
a	O
characteristic	O
impedance	O
of	O
75	O
Ω	O
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
to	O
reuse	O
existing	O
coaxial	O
cable	O
when	O
upgrading	O
from	O
an	O
analogue	O
to	O
a	O
digital	B-Device
camera	I-Device
system	O
.	O
</s>
<s>
The	O
original	O
connector	O
for	O
CoaXPress	B-Device
is	O
a	O
75	O
Ω	O
IEC	O
61169-8	O
BNC	B-Protocol
connector	I-Protocol
.	O
</s>
<s>
The	O
smaller	O
DIN	B-Protocol
1.0/2.3	I-Protocol
connector	O
was	O
added	O
in	O
CoaXPress	B-Device
1.1	O
,	O
and	O
the	O
Micro-BNC	O
connector	O
was	O
then	O
added	O
to	O
CoaXPress	B-Device
2.0	O
for	O
the	O
new	O
speeds	O
faster	O
than	O
CXP-6	O
.	O
</s>
<s>
Most	O
of	O
recent	O
camera	O
and	O
framegrabber	B-Device
products	O
use	O
either	O
DIN	B-Protocol
1.0/2.3	I-Protocol
or	O
Micro-BNC	O
connectors	O
and	O
the	O
IEC	O
61169-8	O
BNC	O
has	O
become	O
rather	O
rare	O
.	O
</s>
<s>
Solutions	O
with	O
a	O
5W5	O
connector	O
have	O
also	O
been	O
demonstrated	O
,	O
but	O
this	O
is	O
not	O
officially	O
supported	O
by	O
the	O
CoaXPress	B-Device
consortium	O
.	O
</s>
<s>
CoaXPress	B-Device
is	O
a	O
scalable	O
standard	O
and	O
can	O
be	O
used	O
for	O
connections	O
from	O
1.25	O
Gbit/s	O
up	O
to	O
25	O
Gbit/s	O
and	O
more	O
.	O
</s>
<s>
Note	O
that	O
the	O
following	O
chart	O
represents	O
typical	O
practical	O
cable	O
lengths	O
;	O
the	O
CoaXPress	B-Device
specification	O
only	O
specifies	O
the	O
electrical	O
characteristics	O
of	O
CXP	O
cables	O
for	O
each	O
speed	O
standard	O
,	O
it	O
does	O
not	O
explicitly	O
specify	O
maximum	O
lengths	O
.	O
</s>
<s>
CoaXPress	B-Device
supports	O
a	O
low	O
speed	O
uplink	O
channel	O
from	O
frame	B-Device
grabber	I-Device
to	O
camera	O
.	O
</s>
<s>
The	O
uplink	O
channel	O
uses	O
8b/10b	B-Protocol
encoding	I-Protocol
.	O
</s>
<s>
When	O
using	O
the	O
multilane	O
DIN	B-Protocol
1.0/2.3	I-Protocol
cabling	O
solution	O
an	O
optional	O
high	O
speed	O
uplink	O
can	O
also	O
be	O
used	O
,	O
allowing	O
6.25	O
Gbit/s	O
uplink	O
communication	O
to	O
the	O
camera	O
.	O
</s>
<s>
The	O
most	O
common	O
application	O
is	O
to	O
interface	B-Application
cameras	O
to	O
computers	O
(	O
via	O
a	O
frame	B-Device
grabber	I-Device
)	O
on	O
applications	O
(	O
such	O
as	O
Machine	B-General_Concept
vision	I-General_Concept
)	O
which	O
involve	O
automated	O
acquisition	O
and	O
analysis	O
of	O
images	O
.	O
</s>
<s>
Some	O
cameras	O
and	O
frame	B-Device
grabbers	I-Device
have	O
been	O
introduced	O
which	O
support	O
and	O
utilize	O
the	O
CoaXPress	B-Device
interface	B-Application
standard	O
.	O
</s>
<s>
So	O
far	O
,	O
there	O
is	O
just	O
one	O
company	O
,	O
Microchip	O
(	O
through	O
its	O
acquisition	O
of	O
EqcoLogic	O
)	O
,	O
which	O
develops	O
CoaXPress	B-Device
compatible	O
driver	O
and	O
equalizer	O
devices	O
.	O
</s>
<s>
These	O
devices	O
must	O
be	O
used	O
with	O
FPGA	B-Architecture
devices	O
,	O
in	O
order	O
to	O
implement	O
CoaXPress	B-Device
standard	O
protocol	O
.	O
</s>
<s>
Such	O
standard	O
implementation	O
is	O
executed	O
using	O
FPGA	B-Architecture
IP	B-Architecture
core	I-Architecture
,	O
specially	O
designed	O
for	O
this	O
protocol	O
,	O
while	O
it	O
takes	O
care	O
of	O
all	O
the	O
features	O
defined	O
by	O
standard	O
.	O
</s>
<s>
Camera	O
or	O
frame	B-Device
grabber	I-Device
,	O
requires	O
dedicated	O
FPGA	B-Architecture
IP	B-Architecture
core	I-Architecture
.	O
</s>
