<s>
VT1.5	B-Protocol
is	O
a	O
type	O
of	O
virtual	O
tributary	O
in	O
SONET	B-Protocol
.	O
</s>
<s>
SONET	B-Protocol
bandwidth	O
is	O
defined	O
in	O
multiples	O
of	O
an	O
OC-1/STS	O
-1	O
,	O
each	O
of	O
which	O
can	O
transport	O
up	O
to	O
51.84	O
Mbit/s	O
.	O
</s>
<s>
In	O
North	O
America	O
and	O
Japan	O
,	O
the	O
VT1.5	B-Protocol
is	O
the	O
most	O
common	O
virtual	O
tributary	O
because	O
it	O
can	O
carry	O
1.544	O
Mbit/s	O
;	O
just	O
enough	O
room	O
for	O
a	O
DS1/T1	B-Protocol
signal	O
.	O
</s>
<s>
Some	O
SONET	B-Protocol
manufacturers	O
offer	O
products	O
that	O
can	O
switch	O
at	O
the	O
VT1.5	B-Protocol
level	O
.	O
</s>
<s>
Such	O
equipment	O
is	O
able	O
to	O
re-arrange	O
the	O
data	O
payloads	O
so	O
that	O
inbound	O
VT1.5s	B-Protocol
are	O
placed	O
into	O
a	O
completely	O
different	O
set	O
of	O
outbound	O
STS	O
's	O
than	O
the	O
ones	O
they	O
arrived	O
in	O
.	O
</s>
