<s>
In	O
telecommunications	O
,	O
a	O
remote	B-Application
digital	I-Application
terminal	I-Application
(	O
RDT	O
)	O
typically	O
accepts	O
E1	O
,	O
T1	O
or	O
OC-3	O
digital	B-Protocol
lines	I-Protocol
to	O
communicate	O
with	O
a	O
telephone	O
Access	O
network	O
(	O
AN	O
)	O
or	O
telephone	O
exchange	O
(	O
Local	O
Digital	O
Switch	O
,	O
LDS	O
)	O
on	O
one	O
side	O
,	O
and	O
forms	O
a	O
local	B-Device
exchange	I-Device
(	O
LE	O
)	O
on	O
the	O
other	O
,	O
which	O
is	O
connected	O
to	O
"	O
plain	O
old	O
telephone	O
service	O
"	O
(	O
POTS	O
)	O
lines	O
.	O
</s>
