<s>
A	O
modem	B-Device
sharing	I-Device
device	I-Device
(	O
MSD	O
)	O
,	O
also	O
commonly	O
known	O
as	O
a	O
line	B-Device
sharing	I-Device
device	I-Device
(	O
LSD	O
)	O
,	O
modem	B-Device
sharer	I-Device
,	O
or	O
line	B-Device
sharer	I-Device
,	O
allows	O
multiple	O
devices	O
to	O
share	O
a	O
serial	B-Protocol
connection	O
.	O
</s>
<s>
Only	O
multipoint	O
serial	B-Protocol
protocols	O
such	O
as	O
Bisync	B-Protocol
are	O
supported	O
.	O
</s>
<s>
A	O
common	O
example	O
would	O
be	O
a	O
Tandem	O
as	O
host	O
connected	O
to	O
multiple	O
automatic	O
teller	O
machines	O
often	O
with	O
a	O
modem	B-Application
or	O
Cisco	O
router	B-Protocol
in-between	O
.	O
</s>
