<s>
The	O
IBM	B-Protocol
1009	I-Protocol
Data	O
Transmission	O
Unit	O
was	O
an	O
IBM	O
communications	B-General_Concept
controller	I-General_Concept
introduced	O
in	O
1960	O
.	O
</s>
<s>
The	O
1009	O
used	O
the	O
Synchronous	B-Protocol
transmit-receive	I-Protocol
(	O
STR	O
)	O
protocol	O
to	O
transfer	O
data	O
at	O
150	O
characters	O
per	O
second	O
(	O
cps	O
)	O
over	O
a	O
single	O
point-to-point	O
dial	O
or	O
leased	O
telephone	O
line	O
.	O
</s>
<s>
The	O
system	O
was	O
advertised	O
as	O
being	O
able	O
to	O
"	O
link	O
the	O
magnetic	O
core	O
memories	O
of	O
IBM	B-Device
1401	I-Device
computers	O
over	O
telephone	O
lines.	O
"	O
</s>
<s>
In	O
1962	O
the	O
1009	O
was	O
part	O
of	O
a	O
test	O
of	O
data	O
communications	O
using	O
the	O
Telstar	B-Application
satellite	O
to	O
link	O
two	O
1401	B-Device
computer	O
systems	O
.	O
</s>
