<s>
Van	B-Protocol
Jacobson	I-Protocol
TCP/IP	I-Protocol
Header	I-Protocol
Compression	I-Protocol
is	O
a	O
data	B-General_Concept
compression	I-General_Concept
protocol	O
described	O
in	O
,	O
specifically	O
designed	O
by	O
Van	O
Jacobson	O
to	O
improve	O
TCP/IP	B-Protocol
performance	O
over	O
slow	O
serial	O
links	O
.	O
</s>
<s>
Van	O
Jacobson	O
compression	O
reduces	O
the	O
normal	O
40	O
byte	B-Application
TCP/IP	B-Protocol
packet	O
headers	O
down	O
to	O
3	O
–	O
4	O
bytes	B-Application
for	O
the	O
average	O
case	O
.	O
</s>
<s>
Van	O
Jacobson	O
Header	O
Compression	O
(	O
also	O
VJ	O
compression	O
,	O
or	O
just	O
Header	O
Compression	O
)	O
is	O
an	O
option	O
in	O
most	O
versions	O
of	O
PPP	B-Protocol
.	O
</s>
<s>
Versions	O
of	O
Serial	B-Protocol
Line	I-Protocol
Internet	I-Protocol
Protocol	I-Protocol
(	O
SLIP	O
)	O
with	O
VJ	O
compression	O
are	O
often	O
called	O
CSLIP	B-Protocol
(	O
Compressed	B-Protocol
SLIP	I-Protocol
)	O
.	O
</s>
