<s>
Communications	B-Device
and	I-Device
networking	I-Device
riser	I-Device
(	O
CNR	O
)	O
is	O
a	O
slot	O
found	O
on	O
certain	O
PC	B-Device
motherboards	I-Device
and	O
used	O
for	O
specialized	O
networking	B-Protocol
,	O
audio	B-Device
,	O
and	O
telephony	O
equipment	O
.	O
</s>
<s>
A	O
motherboard	B-Device
manufacturer	O
can	O
choose	O
to	O
provide	O
audio	B-Device
,	O
networking	B-Protocol
,	O
or	O
modem	B-Application
functionality	O
in	O
any	O
combination	O
on	O
a	O
CNR	O
card	O
.	O
</s>
<s>
CNR	O
slots	O
were	O
once	O
commonly	O
found	O
on	O
Pentium	O
III-class	O
motherboards	B-Device
,	O
but	O
have	O
since	O
been	O
phased	O
out	O
in	O
favor	O
of	O
on-board	O
or	O
embedded	O
components	O
.	O
</s>
<s>
CNR	O
Type	O
A	O
uses	O
8-pin	O
PHY	O
interface	O
,	O
while	O
Type	O
B	O
uses	O
17-pin	O
media-independent	B-Protocol
interface	I-Protocol
(	O
MII	O
)	O
bus	O
LAN	O
interface	O
.	O
</s>
<s>
Both	O
types	O
carry	O
USB	B-Protocol
and	O
AC'97	O
signals	O
.	O
</s>
<s>
As	O
with	O
AMR	O
,	O
CNR	O
had	O
the	O
cost	O
savings	O
potential	O
for	O
manufacturers	O
by	O
removing	O
analog	O
I/O	B-General_Concept
components	O
from	O
the	O
motherboard	B-Device
.	O
</s>
<s>
This	O
allowed	O
the	O
manufacturer	O
to	O
only	O
certify	O
with	O
the	O
US	O
Federal	O
Communications	O
Commission	O
(	O
FCC	O
)	O
for	O
the	O
CNR	O
card	O
,	O
and	O
not	O
the	O
entire	O
motherboard	B-Device
.	O
</s>
<s>
This	O
resulted	O
in	O
a	O
quicker	O
production-to-market	O
time	O
for	O
new	O
motherboards	B-Device
,	O
and	O
allowed	O
mass-production	O
of	O
CNR	O
cards	O
to	O
be	O
used	O
on	O
multiple	O
motherboards	B-Device
.	O
</s>
<s>
Its	O
principal	O
advantage	O
over	O
CNR	O
was	O
the	O
backwards-compatible	B-General_Concept
slot	O
layout	O
which	O
allowed	O
it	O
to	O
use	O
both	O
AMR	O
and	O
ACR	O
cards	O
.	O
</s>
<s>
The	O
same	O
group	O
also	O
developed	O
a	O
physically	O
smaller	O
version	O
,	O
the	O
MDC	B-Device
.	O
</s>
<s>
Intel	O
developed	O
the	O
CNR	O
slot	O
to	O
replace	O
its	O
own	O
audio/modem	O
riser	O
(	O
AMR	O
)	O
technology	O
,	O
drawing	O
on	O
two	O
distinct	O
advantages	O
over	O
the	O
AMR	O
slot	O
it	O
replaced	O
;	O
CNR	O
was	O
both	O
capable	O
of	O
being	O
either	O
software	O
based	O
(	O
CPU-controlled	O
)	O
or	O
hardware	O
accelerated	O
(	O
dedicated	O
ASIC	O
)	O
,	O
and	O
was	O
plug-and-play	B-Device
compatible	O
.	O
</s>
<s>
On	O
some	O
motherboards	B-Device
,	O
a	O
CNR	O
slot	O
replaced	O
the	O
last	O
PCI	B-Protocol
slot	I-Protocol
,	O
but	O
most	O
motherboard	B-Device
manufacturers	O
engineered	O
boards	O
which	O
allow	O
the	O
CNR	O
and	O
last	O
PCI	B-Protocol
slot	I-Protocol
to	O
share	O
the	O
same	O
space	O
.	O
</s>
<s>
With	O
the	O
integration	O
of	O
components	O
such	O
as	O
ethernet	O
and	O
audio	B-Device
into	O
the	O
motherboard	B-Device
,	O
the	O
CNR	O
is	O
obsolete	O
,	O
and	O
is	O
not	O
found	O
on	O
PC	B-Device
motherboards	I-Device
anymore	O
.	O
</s>
