<s>
Enhanced	B-Algorithm
Transmission	I-Algorithm
Selection	I-Algorithm
(	O
ETS	O
)	O
is	O
a	O
network	B-Application
scheduler	I-Application
scheduling	O
algorithm	O
that	O
has	O
been	O
defined	O
by	O
the	O
Data	B-Protocol
Center	I-Protocol
Bridging	I-Protocol
Task	O
Group	O
of	O
the	O
IEEE	O
802.1	O
Working	O
Group	O
.	O
</s>
<s>
It	O
is	O
a	O
hierarchical	O
scheduler	O
that	O
combines	O
static	O
priority	O
scheduling	O
and	O
a	O
bandwidth	O
sharing	O
algorithms	O
(	O
such	O
as	O
Weighted	B-Algorithm
round	I-Algorithm
robin	I-Algorithm
or	O
Deficit	B-Algorithm
round	I-Algorithm
robin	I-Algorithm
)	O
.	O
</s>
<s>
The	O
Enhanced	B-Algorithm
Transmission	I-Algorithm
Selection	I-Algorithm
algorithm	O
is	O
one	O
scheduling	O
algorithm	O
supported	O
by	O
IEEE	O
802.1Q	O
.	O
</s>
<s>
In	O
Enhanced	B-Algorithm
Transmission	I-Algorithm
Selection	I-Algorithm
,	O
they	O
are	O
two	O
types	O
or	O
queues	O
:	O
Strict	O
priority	O
or	O
Credit-based	O
queues	O
,	O
and	O
bandwidth-assigned	O
queues	O
.	O
</s>
<s>
The	O
standard	O
does	O
not	O
specify	O
which	O
bandwidth-sharing	O
algorithm	O
must	O
be	O
used	O
since	O
there	O
are	O
a	O
number	O
of	O
variants	O
of	O
bandwidth	O
sharing	O
algorithm	O
,	O
but	O
gives	O
some	O
constraints	O
and	O
references	O
Weighted	B-Algorithm
round	I-Algorithm
robin	I-Algorithm
.	O
</s>
<s>
The	O
does	O
not	O
consider	O
Credit-based	O
queues	O
and	O
uses	O
Deficit	B-Algorithm
round	I-Algorithm
robin	I-Algorithm
as	O
bandwidth-sharing	O
algorithm	O
.	O
</s>
