Nokia D211 Developer's Manual page 37

Gsm/hscsd/gprs and wlan pc card
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Passive scan
Indicates the maximum time
timing
that a station spends on each
channel when performing a
passive scan
Performance
Based on connection quality
management
measurements, performance
management can
automatically change
fragmentation threshold, RTS
threshold, and data rate in
order to improve stability and
bandwidth.
RTS threshold Controls for what size data
packet the MAC (Media
Access Control) protocol
uses the RTS/CTS (Request
to send/Clear To Send)
handshake. Note that
performance management
overrides this setting.
200 – 1000
scanning Passive scan is performed when
(250 time units)
On, Off
Mac
(On)
256 - 2346
Mac
(2346 bytes)
prompting for network to be
joined when selecting the profile.
The value should be higher (at
least double) than the beacon
period of the networks available.
Otherwise it is not guaranteed
that all networks are found during
the passive scan.
The station learns which rates
are most probably successful and
weights these rates while
selecting the transmission rate.
Reduces unnecessary
retransmissions while operating
in low signal strength conditions.
RTS/CTS handshaking is used
for reducing frame collisions
arising from hidden node
problems. Hidden node problems
can also be present in a network
where the stations are operating
at the limits of the range of an
access point so that individual
stations are not able to hear each
other. Hidden node problems can
exist if there are overlapping
networks operating on the same
or neighbouring channels.
RTS/CTS handshake reduces
available bandwidth significantly,
but effectively reduces collisions.
Setting the limit to 2346 bytes
disables the procedure (no frame
can be this long). Value 0 means
that no RTS/CTS is used.
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