Wireless LAN – WLAN
102
3.7
IEEE 802.11i for point-to-point connections
BAT54-Rail/F..
Release
7.54
06/08
D Off: The access point only communicates with mobile clients
D On: The access point can communicate with other access points and with
mobile clients
D Exclusive: The access point only communicates with other base stations
In the 5 GHz band, the automatic search for vacant WLAN channels can lead
to several simultaneous test transmissions from multiple access points, with
the result that they do not find each other. This stalemate situation can be
avoided with the appropriate "Channel selection scheme":
D Master: This access point takes over the leadership when selecting a free
WLAN channel.
D Slave: All other access points will search for a channel until they have
found a transmitting Master.
Thus it is recommended for the 5 GHz band that one central access point
should be configured as 'Master' and all other point-to-point partners should
be configured as 'Slave'. In the 2.4 GHz band, too, this setting simplifies the
establishment of point-to-point connections if the automatic channel search
is activated.
Note: It is imperative that the channel selection scheme is configured cor-
rectly if the point-to-point connections are to be encrypted with 802.11i/
WPA.
3.7.1 Antenna alignment for P2P operations
The precise alignment of the antennas is of considerable importance in es-
tablishing P2P connections. The more central the receiving antenna is locat-
ed in the "ideal line" of the transmitting antenna, the better are the actual
performance and the effective bandwidth 쐃. If the receiving antenna is out-
side of this ideal area, however, significant losses in performance will be the
result 쐇.
The current signal quality over a P2P connection can be displayed on the de-
vice's LEDs or in the LANmonitor in order to help find the best possible align-
ment for the antennas. Right-clicking with the mouse on 'Point-to-point'
activates the option 'Adjusting Point-to-Point WLAN Antennas...'
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