<s>
Zeta-TCP	B-Protocol
refers	O
to	O
a	O
set	O
of	O
proprietary	O
Transmission	B-Protocol
Control	I-Protocol
Protocol	I-Protocol
(	O
TCP	O
)	O
algorithms	O
aiming	O
at	O
improving	O
the	O
end-to-end	O
performance	O
of	O
TCP	O
,	O
regardless	O
of	O
whether	O
the	O
peer	O
is	O
Zeta-TCP	B-Protocol
or	O
any	O
other	O
TCP	B-Protocol
protocol	I-Protocol
stack	O
,	O
in	O
other	O
words	O
,	O
to	O
be	O
compatible	O
with	O
the	O
existing	O
TCP	O
algorithms	O
.	O
</s>
<s>
Zeta-TCP	B-Protocol
primarily	O
provides	O
the	O
following	O
improvements	O
:	O
</s>
<s>
TCP	B-Protocol
Vegas	I-Protocol
and	O
its	O
variations	O
,	O
most	O
notably	O
FAST	B-Protocol
TCP	I-Protocol
,	O
base	O
their	O
congestion	O
predications	O
on	O
the	O
RTT	O
measurement	O
only	O
.	O
</s>
<s>
Zeta-TCP	B-Protocol
addresses	O
the	O
problem	O
by	O
combining	O
the	O
strength	O
of	O
latency-based	O
and	O
loss-based	O
algorithms	O
.	O
</s>
<s>
Zeta-TCP	B-Protocol
provides	O
a	O
simple	O
algorithm	O
to	O
calculate	O
the	O
loss	O
probability	O
on	O
every	O
unSACK	O
'd	O
packet	O
.	O
</s>
<s>
Therefore	O
,	O
Zeta-TCP	B-Protocol
minimizes	O
the	O
number	O
of	O
retransmitted	O
packets	O
,	O
further	O
improving	O
the	O
bandwidth	O
utilization	O
.	O
</s>
<s>
Lab	O
tests	O
have	O
confirmed	O
that	O
Zeta-TCP	B-Protocol
retransmitted	O
much	O
fewer	O
packets	O
than	O
the	O
other	O
TCP	O
implementations	O
under	O
the	O
same	O
loss	O
rate	O
.	O
</s>
<s>
Zeta-TCP	B-Protocol
has	O
developed	O
a	O
mechanism	O
to	O
accurately	O
detect	O
the	O
packet	O
loss	O
at	O
the	O
earliest	O
time	O
once	O
it	O
suspects	O
a	O
loss	O
is	O
likely	O
to	O
happen	O
.	O
</s>
<s>
The	O
inbound	O
rate	O
limiting	O
of	O
Zeta-TCP	B-Protocol
lays	O
the	O
foundation	O
of	O
the	O
inbound	O
flow	O
control	O
of	O
AppEx	O
IPEQ	O
.	O
</s>
<s>
At	O
the	O
time	O
of	O
writing	O
,	O
Zeta-TCP	B-Protocol
has	O
been	O
implemented	O
as	O
software	O
modules	O
for	O
Linux	O
(	O
Netfilter	B-Application
Kernel	O
Module	O
)	O
,	O
Microsoft	O
Windows	O
10	O
down	O
to	O
XP	O
and	O
related	O
Windows	O
Server	O
versions	O
(	O
NDIS	B-Application
IM	O
Filter/NDIS	O
LWF	O
)	O
,	O
and	O
WinCE	O
.	O
</s>
