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6.3 Frequency Range
WLAN uses the frequency range around 2.4 GHz in the ISM
band or, alternatively, the frequency range at 5 GHz.
With the FRITZ!WLAN USB Stick N 2.4 you can use the 2.4-
GHz frequency band.
A WLAN in the 2.4-GHz frequency band works in the same
band as Bluetooth, DECT, microwave devices, video bridg-
es and baby monitors. This means that interference may
occur within WLANs operated in the vicinity of such devic-
es. Generally the only adverse effects are to the transmis-
sion rate; aborted connections and data losses are rare.
In the 2.4-GHz frequency range the European regulation
authorities have designated 13 channels for WLAN. One
channel has a bandwidth of 20 or 40 MHz.
Channels located directly next to each other may overlap
and result in mutual interference. For instance, if several
WLANs are operated close to each other in the 2.4-GHz fre-
quency range, a distance of at least five channels should
be left empty between each two channels used. This
means that if channel 1 is selected for one WLAN, the
channels 6 through 13 can be selected for a second
WLAN. This maintains the minimum distance between
channels.
Should interference in a WLAN persist, the first step
should be to select a different channel. If your WLAN ac-
cess point is equipped with an autochannel function, you
can automatically have it search for the WLAN channel in
your frequency range that is subject to the least interfer-
ence. For more instructions, see the section “WLAN Con-
nection Is Not Established” from page 41.
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