– 49 –
Chapter
4
|
Wireless
Settings
Radio
Settings
Table
4:
Tx
Power
(Continued)
20
dBM
(100
mW)
√
21
dBM
(125
mW)
√
22
dBM
(158
mW)
√
23
dBM
(199
mW)
√
24
dBM
(251
mW)
√
25
dBM
(316
mW)
√
26
dBM
(398
mW)
√
27
dBM
(501
mW)
√
◆
ACK
Timeout
—
Sets
the
acknowledgement
timeout,
which
is
used
primarily
for
long
‐
distance
connections.
This
timeout
is
used
to
make
an
adjustment
for
link
distance.
It
is
based
on
the
amount
of
time,
in
microseconds,
that
it
should
take
to
transmit
a
frame
to
the
other
end
of
the
link,
be
processed
by
the
receiving
device,
and
have
the
ACK
frame
created
and
returned
to
the
sending
device.
(Range:
0
‐
255
microseconds;
Default:
0
microseconds)
◆
Fragmentation
Thresh.
—
Sets
the
maximum
frame
size
above
which
packets
are
fragmented.
This
reduces
the
time
required
to
transmit
the
frame,
and
therefore
reduces
the
probability
that
it
will
be
corrupted
(at
the
cost
of
more
data
overhead).
(Range:
256
‐
2346
bytes;
Default:
2346
bytes)
◆
RTS
Threshold
—
Sets
the
packet
size
threshold
at
which
a
Request
to
Send
(RTS)
signal
must
be
sent
to
a
receiving
station
prior
to
the
sending
station
starting
communications.
The
access
point
sends
RTS
frames
to
a
receiving
station
to
negotiate
the
sending
of
a
data
frame.
After
receiving
an
RTS
frame,
the
station
sends
a
CTS
(clear
to
send)
frame
to
notify
the
sending
station
that
it
can
start
sending
data.
If
the
RTS
threshold
is
set
to
1,
the
access
point
always
sends
RTS
signals.
If
set
to
2346,
the
access
point
never
sends
RTS
signals.
If
set
to
any
other
value,
and
the
packet
size
equals
or
exceeds
the
RTS
threshold,
the
RTS/CTS
(Request
to
Send
/
Clear
to
Send)
mechanism
will
be
enabled.
The
access
points
contending
for
the
medium
may
not
be
aware
of
each
other.
The
RTS/CTS
mechanism
can
solve
this
“Hidden
Node
Problem.”
(Range:
1
‐
2346
bytes:
Default:
2346
bytes)
◆
SGI
—
The
802.11n
draft
specifies
two
guard
intervals:
400ns
(short)
and
800ns
(long).
Support
of
the
400ns
Short
Guard
Interval
is
optional
for
transmit
and
receive.
The
purpose
of
a
guard
interval
is
to
introduce
immunity
to
propagation
delays,
echoes,
and
reflections
to
which
digital
data
is
normally
very
sensitive.
Enabling
the
SGI
sets
it
to
400ns.
(Default:
Disabled)
Power
Radio
0
(5
GHz)
Radio
1
(2.4
GHz)
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