<s>
The	O
IBM	B-Device
7701	I-Device
Magnetic	B-Architecture
Tape	I-Architecture
Transmission	O
Terminal	O
was	O
a	O
communications	O
device	O
announced	O
by	O
IBM	O
in	O
1960	O
.	O
</s>
<s>
It	O
was	O
designed	O
to	O
transfer	O
the	O
contents	O
of	O
a	O
reel	O
of	O
magnetic	B-Architecture
tape	I-Architecture
over	O
a	O
leased	O
or	O
dial	O
telephone	O
circuit	O
.	O
</s>
<s>
The	O
IBM	B-Device
7702	I-Device
was	O
a	O
similar	O
device	O
that	O
could	O
communicate	O
at	O
higher	O
speeds	O
.	O
</s>
<s>
The	O
7701	O
communicated	O
using	O
the	O
Synchronous	B-Protocol
transmit-receive	I-Protocol
(	O
STR	O
)	O
communications	O
protocol	O
over	O
either	O
private	O
or	O
switched	O
(	O
message	O
service	O
)	O
telephone	O
lines	O
.	O
</s>
<s>
The	O
devices	O
used	O
a	O
special	O
incremental	O
magnetic	B-Architecture
tape	I-Architecture
drive	O
that	O
was	O
controlled	O
by	O
the	O
STR	O
communications	O
unit	O
.	O
</s>
<s>
The	O
drive	O
used	O
standard	O
one	O
half	O
inch	O
,	O
seven	O
track	O
magnetic	B-Architecture
tape	I-Architecture
reels	O
recorded	O
at	O
200	O
bytes	O
per	O
inch	O
(	O
BPI	O
)	O
.	O
</s>
