Nokia D211 Developer's Manual page 35

Gsm/hscsd/gprs and wlan pc card
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Beacon period Indicates the number of time
units that a station will use for
scheduling beacon
transmissions when in the ad
hoc operating mode. Only
valid when creating an ad
hoc network.
Broadcast
Defines the way how the
SSID
station searches for the
WLAN access point.
Channel
Indicates the radio channel
on which the radio card is
used. The option "automatic"
allocates an available
channel automatically.
The option "France" only
allows the use of channels
10 – 13.
Fragmentation
Defines a threshold above
threshold
which the RF packet will be
split up. Note that
performance management
overrides this setting
100 - 1000
ad hoc
(100 time units)
On, Off
scanning If the access point does not allow
(Off)
1 - 13
radio
(automatic)
256 - 2346
Mac
(2346 bytes)
Stations joining an existing ad
hoc network assume that the
beacon period is already defined
for the network. Shorter beacon
period means faster transmission
in an ad hoc network with power
saving. Longer period (when
used with power saving) will
result in lower power
consumption.
for broadcast SSID, it should not
be used with the station either.
If the radio channel is configured
manually, no other channels are
scanned for. In this case roaming
between access points is not
possible if they are in different
channels. This value can be used
if a station is stationary and it
should associate to a certain
access point. NOTE: Using some
channels may be restricted by
local laws e.g. in France.
The fragmentation procedure
divides each frame into
fragments that have the length of
Fragmentation Threshold. Each
fragment is acknowledged and
retransmitted individually, thus
increasing the robustness of the
link in pulsed interference
scenarios (e.g. Bluetooth) at the
expense of reduced throughput.
Other use for fragmentation
would be in a high-multipath
environment with fast changes
(e.g. large industrial indoor sites
with wireless LAN equipment
mounted on moving vehicles).
Setting the threshold to 2346
effectively disables the
fragmentation (no frame can be
this long). Must be an even
value.
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