<s>
In	O
telecommunications	O
a	O
point	B-Architecture
of	I-Architecture
interface	I-Architecture
(	O
POI	O
)	O
is	O
used	O
to	O
show	O
the	O
physical	O
interface	O
between	O
two	O
different	O
carriers	O
,	O
such	O
as	O
a	O
local	O
exchange	O
carrier	O
(	O
LEC	O
)	O
and	O
a	O
wireless	O
carrier	O
,	O
or	O
an	O
LEC	O
and	O
an	O
IntereXchange	O
Carrier	O
(	O
IXC	O
)	O
.	O
</s>
<s>
This	O
demarcation	B-Architecture
point	I-Architecture
often	O
defines	O
responsibility	O
as	O
well	O
as	O
serving	O
as	O
a	O
point	O
for	O
testing	O
.	O
</s>
<s>
In	O
many	O
cases	O
,	O
a	O
POI	O
exists	O
as	O
a	O
point	O
of	O
demarcation	O
(	O
"	O
DEMARC	B-Architecture
"	O
)	O
within	O
an	O
LEC	O
building	O
,	O
and	O
is	O
established	O
under	O
"	O
co-location	B-Application
"	O
agreements	O
.	O
</s>
<s>
A	O
long	O
distance	O
,	O
wireless	O
,	O
or	O
competitive	O
local	O
carrier	O
"	O
rents	O
"	O
space	O
at	O
the	O
local	O
telephone	O
(	O
usually	O
tandem	B-Device
switch	I-Device
)	O
location	O
.	O
</s>
<s>
In	O
recent	O
years	O
,	O
"	O
electronic	O
frames	O
"	O
such	O
as	O
digital	B-Architecture
cross	I-Architecture
connect	I-Architecture
systems	I-Architecture
have	O
been	O
used	O
as	O
POI	O
devices	O
.	O
</s>
