<s>
It	O
is	O
based	O
on	O
a	O
QoS	O
and	O
CBQ	B-Algorithm
.	O
</s>
<s>
An	O
implementation	O
of	O
HFSC	O
is	O
available	O
in	O
all	O
operating	O
systems	O
based	O
on	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
such	O
as	O
e.g.	O
</s>
<s>
OpenWrt	B-Application
,	O
and	O
also	O
in	O
DD-WRT	B-Protocol
,	O
NetBSD	B-Device
5.0	O
,	O
FreeBSD	B-Operating_System
8.0	O
and	O
OpenBSD	B-Operating_System
4.6	O
.	O
</s>
