<s>
Lynx	B-Protocol
is	O
a	O
file	B-Protocol
transfer	I-Protocol
protocol	I-Protocol
for	O
use	O
with	O
modems	B-Application
,	O
and	O
the	O
name	O
of	O
the	O
program	O
that	O
implements	O
the	O
protocol	O
.	O
</s>
<s>
Lynx	B-Protocol
is	O
based	O
on	O
a	O
sliding	O
window	O
protocol	O
with	O
two	O
to	O
sixteen	O
packets	O
per	O
window	O
(	O
or	O
"	O
block	O
"	O
)	O
,	O
and	O
64	O
bytes	O
of	O
data	O
per	O
packet	O
.	O
</s>
<s>
It	O
also	O
applies	O
run	B-Algorithm
length	I-Algorithm
encoding	I-Algorithm
(	O
RLE	O
)	O
to	O
the	O
data	O
on	O
a	O
per-block	O
basis	O
to	O
compress	O
suitable	O
data	O
.	O
</s>
<s>
Lynx	B-Protocol
was	O
developed	O
by	O
Matthew	O
Thomas	O
,	O
who	O
released	O
it	O
as	O
shareware	B-License
in	O
1989	O
.	O
</s>
<s>
The	O
protocol	O
was	O
supported	O
primarily	O
by	O
the	O
Lynx	B-Protocol
program	O
,	O
and	O
appears	O
to	O
have	O
seen	O
little	O
or	O
no	O
support	O
in	O
bulletin	B-Application
board	I-Application
systems	I-Application
(	O
BBSs	O
)	O
or	O
online	O
services	O
.	O
</s>
<s>
The	O
Lynx	B-Protocol
program	O
was	O
run	O
from	O
the	O
command	B-Application
line	I-Application
to	O
start	O
transfers	O
,	O
there	O
is	O
no	O
documented	O
example	O
of	O
a	O
3rd	O
party	O
terminal	B-Application
emulator	I-Application
supporting	O
the	O
system	O
.	O
</s>
<s>
The	O
protocol	O
was	O
relatively	O
simple	O
,	O
largely	O
identical	O
to	O
WXMODEM	B-Protocol
with	O
the	O
exception	O
that	O
it	O
used	O
fixed-size	O
64-byte	O
packets	O
in	O
windows	O
of	O
two	O
to	O
sixteen	O
packets	O
,	O
rather	O
than	O
one	O
to	O
four	O
128-byte	O
packets	O
in	O
WXMODEM	B-Protocol
.	O
</s>
<s>
Like	O
TeLink	O
,	O
Lynx	B-Protocol
also	O
included	O
a	O
separate	O
header	O
packet	O
that	O
contained	O
file	O
information	O
:	O
</s>
<s>
This	O
allowed	O
file	B-Protocol
transfers	I-Protocol
to	O
be	O
automated	O
,	O
sending	O
multiple	O
files	O
in	O
a	O
single	O
session	O
by	O
having	O
the	O
receiver	O
extract	O
the	O
names	O
of	O
the	O
files	O
as	O
they	O
were	O
received	O
.	O
</s>
<s>
The	O
Lynx	B-Protocol
program	O
allowed	O
up	O
to	O
99	O
files	O
to	O
be	O
sent	O
in	O
a	O
batch	O
,	O
although	O
there	O
is	O
no	O
limit	O
in	O
the	O
protocol	O
itself	O
.	O
</s>
<s>
Lynx	B-Protocol
tests	O
each	O
block	O
for	O
compressibility	O
before	O
transmitting	O
it	O
.	O
</s>
<s>
RLE	B-Algorithm
compression	I-Algorithm
is	O
used	O
for	O
this	O
operation	O
.	O
</s>
<s>
Archived	O
,	O
ZIPped	B-General_Concept
,	O
or	O
other	O
compressed	O
files	O
will	O
likely	O
not	O
be	O
further	O
condensed	O
by	O
this	O
technique	O
.	O
</s>
<s>
Note	O
that	O
Lynx	B-Protocol
will	O
always	O
optimize	O
the	O
transmission	O
of	O
each	O
block	O
,	O
if	O
RLE	O
decreases	O
the	O
block	O
length	O
,	O
it	O
will	O
be	O
used	O
;	O
otherwise	O
,	O
the	O
uncompressed	O
packet	O
will	O
be	O
sent	O
.	O
</s>
<s>
Lynx	B-Protocol
required	O
8-bit	O
clean	O
links	O
and	O
did	O
not	O
include	O
any	O
sort	O
of	O
escaping	O
.	O
</s>
<s>
It	O
only	O
supports	O
CTS/RTS	O
hardware	O
handshaking	B-Protocol
,	O
is	O
considered	O
valid	O
data	O
.	O
</s>
