<s>
Remote	B-General_Concept
data	I-General_Concept
transmission	I-General_Concept
(	O
RDT	O
)	O
was	O
a	O
term	O
used	O
in	O
the	O
1980s	O
,	O
primarily	O
in	O
Germany	O
,	O
for	O
the	O
transmission	O
of	O
data	O
between	O
computers	O
over	O
a	O
medium	O
using	O
a	O
communications	O
protocol	O
.	O
</s>
<s>
Systems	O
for	O
remote	B-Protocol
administration	I-Protocol
of	O
facilities	O
and	O
remote	B-Protocol
control	I-Protocol
adjustments	O
may	O
use	O
remote	B-General_Concept
data	I-General_Concept
transmission	I-General_Concept
standards	O
.	O
</s>
<s>
For	O
this	O
,	O
special	O
hardware	B-Architecture
,	O
e.g.	O
,	O
a	O
modem	B-Application
or	O
an	O
ISDN	B-Protocol
card	I-Protocol
is	O
necessary	O
.	O
</s>
<s>
When	O
remote	B-General_Concept
data	I-General_Concept
transmission	I-General_Concept
began	O
,	O
data	O
were	O
exchanged	O
by	O
the	O
use	O
of	O
diskettes	B-Device
,	O
magnetic	O
tape	O
,	O
punched	O
tape	O
and	O
dispatched	O
via	O
courier	B-Protocol
(	O
the	O
so-called	O
sneaker	O
net	O
)	O
.	O
</s>
<s>
In	O
the	O
beginning	O
,	O
electronic	O
remote	B-General_Concept
data	I-General_Concept
transmission	I-General_Concept
was	O
also	O
accomplished	O
through	O
special	O
adapters	O
on	O
special	O
data	O
or	O
telex	B-Application
lines	O
,	O
teleprinter	O
,	O
serial	B-Protocol
ports	I-Protocol
,	O
and	O
analog	O
telephone ]	O
or	O
over	O
simple	O
radio	O
connections	O
.	O
</s>
<s>
Acoustic	B-Device
couplers	I-Device
that	O
could	O
be	O
attached	O
to	O
a	O
normal	O
telephone	O
handset	O
,	O
and	O
later	O
modems	B-Application
,	O
were	O
used	O
.	O
</s>
<s>
RDT	O
achieved	O
great	O
significance	O
for	O
private	O
users	O
at	O
the	O
end	O
of	O
the	O
1980s	O
with	O
the	O
arrival	O
of	O
local	O
and	O
global	O
bulletin	B-Application
board	I-Application
systems	I-Application
like	O
FidoNet	O
and	O
CompuServe	O
.	O
</s>
<s>
Many	O
of	O
these	O
systems	O
later	O
had	O
internet	O
access	O
via	O
computer	O
gateways	B-Application
,	O
but	O
they	O
were	O
mostly	O
discontinued	O
by	O
the	O
end	O
of	O
the	O
1990s	O
with	O
the	O
internet	O
rise	O
to	O
dominance	O
.	O
</s>
<s>
Communication	O
between	O
PCs	B-Device
through	O
the	O
internet	O
is	O
also	O
a	O
form	O
of	O
remote	B-General_Concept
data	I-General_Concept
transmission	I-General_Concept
.	O
</s>
