<s>
4VSB	B-Device
is	O
an	O
abbreviation	O
for	O
4-level	O
vestigial	O
sideband	O
modulation	O
,	O
a	O
type	O
of	O
radio	O
transmission	O
capable	O
of	O
transmitting	O
two	O
bits	O
of	O
information	O
(	O
22	O
=	O
4	O
)	O
at	O
a	O
time	O
.	O
</s>
<s>
Other	O
faster	O
but	O
less	O
rugged	O
forms	O
include	O
8VSB	B-Device
and	O
16VSB	B-Device
.	O
</s>
<s>
While	O
2VSB	B-Device
is	O
more	O
rugged	O
,	O
it	O
is	O
also	O
slower	O
.	O
</s>
