<s>
A	O
fax	B-Device
modem	I-Device
enables	O
a	O
computer	O
to	O
transmit	O
and	O
receive	O
documents	O
as	O
faxes	O
on	O
a	O
telephone	O
line	O
.	O
</s>
<s>
A	O
fax	B-Device
modem	I-Device
is	O
like	O
a	O
data	O
modem	B-Application
but	O
is	O
designed	O
to	O
transmit	O
and	O
receive	O
documents	O
to	O
and	O
from	O
a	O
fax	O
machine	O
or	O
another	O
fax	B-Device
modem	I-Device
.	O
</s>
<s>
Some	O
,	O
but	O
not	O
all	O
,	O
fax	B-Device
modems	I-Device
do	O
double	O
duty	O
as	O
data	O
modems	B-Application
.	O
</s>
<s>
As	O
with	O
other	O
modems	B-Application
,	O
fax	B-Device
modems	I-Device
can	O
be	O
internal	O
or	O
external	O
.	O
</s>
<s>
Internal	O
fax	B-Device
modems	I-Device
are	O
often	O
called	O
fax	O
boards	O
.	O
</s>
<s>
In	O
the	O
early	O
1990s	O
small	O
business	O
PCs	O
commonly	O
had	O
a	O
PC-based	O
fax/modem	B-Device
card	O
and	O
fax	O
software	O
(	O
typically	O
WinFax	B-Protocol
Pro	O
)	O
.	O
</s>
<s>
Largely	O
replaced	O
by	O
email	O
,	O
PC-based	O
faxing	O
with	O
a	O
fax/modem	B-Device
declined	O
at	O
the	O
turn	O
of	O
the	O
century	O
.	O
</s>
<s>
Computer	O
users	O
may	O
set	O
up	O
a	O
PC	O
fax/modem	B-Device
with	O
card	O
,	O
telephone	O
line	O
access	O
and	O
software	O
.	O
</s>
<s>
A	O
special	O
printer	B-Application
driver	I-Application
may	O
be	O
included	O
to	O
allow	O
treating	O
a	O
fax	B-Device
modem	I-Device
as	O
a	O
printer	O
.	O
</s>
<s>
Fax	O
integration	O
is	O
available	O
in	O
unified	B-Protocol
communications	I-Protocol
(	O
e.g.	O
</s>
<s>
E-mail	O
,	O
Voice	O
Mail	O
and	O
Fax	O
managed	O
together	O
)	O
,	O
in	O
a	O
number	O
of	O
Hosted	O
PBX	O
products	O
where	O
standard	O
features	O
allow	O
users	O
to	O
send	O
a	O
fax	O
by	O
using	O
the	O
fax	O
phone	O
number	O
as	O
the	O
address	O
of	O
a	O
E-mail	O
message	O
,	O
and	O
receive	O
incoming	O
faxes	O
via	O
E-mail	O
with	O
the	O
Fax	O
content	O
presented	O
as	O
a	O
PDF	B-Application
attachment	O
.	O
</s>
<s>
Medical	O
systems	O
continue	O
to	O
use	O
this	O
technology	O
into	O
the	O
21st	O
century	O
,	O
but	O
many	O
home	O
and	O
business	O
users	O
dropped	O
the	O
use	O
of	O
fax	B-Device
modems	I-Device
in	O
favor	O
of	O
high	B-General_Concept
speed	I-General_Concept
internet	I-General_Concept
.	O
</s>
