<s>
ZMax	B-Protocol
is	O
a	O
file	B-Protocol
transfer	I-Protocol
protocol	O
developed	O
in	O
1990-1991	O
by	O
Mike	O
Bryeans	O
(	O
Micro	O
TECH	O
Systems	O
)	O
who	O
also	O
developed	O
TMODEM	B-Protocol
.	O
</s>
<s>
Zmax	B-Protocol
is	O
designed	O
to	O
replace	O
ZMODEM	B-Device
.	O
</s>
<s>
It	O
uses	O
32	O
bit	O
CRC	O
's	O
on	O
file	O
data	O
blocks	O
,	O
the	O
same	O
as	O
Zmodem	B-Device
,	O
and	O
32	O
bit	O
CRC	O
's	O
on	O
its	O
information	O
blocks	O
where	O
Zmodem	B-Device
uses	O
16	O
bit	O
.	O
</s>
<s>
In	O
stream	O
mode	O
Zmax	B-Protocol
sends	O
blocks	O
,	O
the	O
size	O
being	O
set	O
by	O
the	O
receiver	O
,	O
of	O
data	O
but	O
does	O
n't	O
require	O
ACKs	O
from	O
the	O
receiver	O
.	O
</s>
<s>
Zmax	B-Protocol
should	O
(	O
depending	O
on	O
equipment	O
,	O
phone	O
lines	O
,	O
implementation	O
,	O
etc	O
.	O
)	O
</s>
<s>
allow	O
about	O
97.5	O
percent	O
efficiency	O
at	O
2400	O
baud	O
on	O
a	O
30K	O
file	O
compared	O
to	O
Zmodem	B-Device
's	O
95	O
percent	O
.	O
</s>
<s>
Unlike	O
Zmodem	B-Device
,	O
Zmax	B-Protocol
reaches	O
full	O
speed	O
on	O
considerably	O
smaller	O
files	O
.	O
</s>
<s>
In	O
Non-Stream	O
mode	O
(	O
which	O
can	O
be	O
set	O
by	O
the	O
receiver	O
or	O
the	O
sender	O
)	O
,	O
Zmax	B-Protocol
is	O
a	O
super	O
Batch	O
XMODEM	B-Protocol
or	O
YMODEM	B-Protocol
depending	O
on	O
the	O
block	O
size	O
,	O
because	O
it	O
uses	O
32	O
bit	O
CRCs	O
instead	O
of	O
16	O
.	O
</s>
<s>
Unlike	O
Zmodem	B-Device
which	O
sets	O
an	O
upper	O
limit	O
of	O
1024	O
bytes	O
on	O
block	O
sizes	O
,	O
Zmax	B-Protocol
has	O
an	O
upper	O
limit	O
of	O
over	O
32K	O
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
Zmax	B-Protocol
may	O
be	O
used	O
as	O
a	O
mailer	O
protocol	O
without	O
any	O
modifications	O
.	O
</s>
<s>
Zmax	B-Protocol
also	O
has	O
a	O
lot	O
less	O
CPU	O
overhead	O
than	O
Zmodem	B-Device
,	O
so	O
slower	O
computers	O
can	O
drive	O
highspeed	O
modems	B-Application
faster	O
.	O
</s>
<s>
Zmax	B-Protocol
does	O
not	O
encode	O
each	O
byte	O
of	O
data	O
like	O
Zmodem	B-Device
does	O
.	O
</s>
<s>
Zmax	B-Protocol
also	O
treats	O
all	O
files	O
as	O
binary	O
8	O
bit	O
files	O
and	O
will	O
require	O
word	O
length	O
to	O
be	O
set	O
to	O
8	O
,	O
which	O
is	O
the	O
most	O
common	O
setting	O
.	O
</s>
