<s>
The	O
term	O
data	B-Architecture
access	I-Architecture
arrangement	I-Architecture
(	O
DAA	O
)	O
has	O
the	O
following	O
meanings	O
:	O
</s>
<s>
In	O
public	O
switched	O
telephone	O
networks	O
,	O
a	O
single	O
item	O
or	O
group	O
of	O
items	O
at	O
the	O
customer	O
side	O
of	O
the	O
network	B-Protocol
interface	I-Protocol
device	I-Protocol
for	O
data	O
transmission	O
purposes	O
,	O
including	O
all	O
equipment	O
that	O
may	O
affect	O
the	O
characteristics	O
of	O
the	O
interface	O
.	O
</s>
<s>
Data	B-Architecture
access	I-Architecture
arrangements	I-Architecture
are	O
an	O
integral	O
part	O
of	O
all	O
modems	B-Application
built	O
for	O
the	O
public	O
telephone	O
network	O
.	O
</s>
<s>
In	O
view	O
of	O
mixed	O
voice	O
and	O
data	B-General_Concept
access	I-General_Concept
,	O
DAAs	O
are	O
more	O
generally	O
referred	O
to	O
as	O
direct	B-Architecture
access	I-Architecture
arrangements	I-Architecture
.	O
</s>
<s>
While	O
DAA	O
now	O
describes	O
an	O
integral	O
component	O
of	O
a	O
device	O
that	O
connects	O
to	O
the	O
telephone	O
network	O
,	O
during	O
the	O
60s	O
and	O
70s	O
it	O
described	O
a	O
separate	O
device	O
mandated	O
by	O
the	O
Bell	O
System	O
,	O
connected	O
between	O
the	O
telephone	O
line	O
and	O
non-Bell	O
equipment	O
,	O
typically	O
a	O
modem	B-Application
.	O
</s>
<s>
At	O
the	O
time	O
,	O
some	O
subscribers	O
believed	O
that	O
the	O
DAA	O
was	O
a	O
scheme	O
by	O
AT&T	O
to	O
penalize	O
and	O
discourage	O
use	O
of	O
non-Bell	O
modems	B-Application
and	O
recover	O
lost	O
profits	O
from	O
hardware	O
sales	O
,	O
and	O
the	O
FCC	O
began	O
investigations	O
into	O
the	O
legality	O
of	O
the	O
practice	O
.	O
</s>
<s>
A	O
manual	O
DAA	O
required	O
a	O
call	O
to	O
be	O
initiated	O
(	O
or	O
answered	O
)	O
as	O
normal	O
,	O
at	O
which	O
point	O
it	O
could	O
then	O
be	O
connected	O
to	O
the	O
third-party	O
device	O
,	O
while	O
an	O
automatic	O
DAA	O
allowed	O
an	O
attached	O
device	O
to	O
be	O
connected	O
without	O
human	O
intervention	O
,	O
important	O
for	O
receiving	O
modem	B-Application
use	O
.	O
</s>
<s>
This	O
technically	O
eliminated	O
the	O
need	O
for	O
DAAs	O
,	O
although	O
the	O
first	O
modem	B-Application
that	O
did	O
n't	O
require	O
a	O
separate	O
DAA	O
was	O
not	O
marketed	O
until	O
1977	O
when	O
a	O
court	O
ruled	O
that	O
Part	O
68	O
was	O
legal	O
.	O
</s>
