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Frequency Ranges
2.3
Frequency Ranges
2.4-GHz Frequency
Band
WLAN
Autochannel
5-GHz Frequency
Band
FRITZ!Box Fon WLAN 7270
WLAN uses the frequency range around 2.4 GHz in the ISM
band or, alternatively, the frequency range at 5 GHz.
You can use both frequency ranges with the FRITZ!Box.
A WLAN in the 2.4-GHz frequency band works in the same
band as Bluetooth, microwave devices and many cordless
telephones. This means that interference may occur within
WLANs operated in the vicinity of such devices. Generally
the only adverse effects are to the transmission rate; abor-
ted connections and data losses are rare.
In the 2.4-GHz frequency range the European regulation au-
thorities have designated 13 channels for WLAN. One chan-
nel has a bandwidth of 20 MHz.
A channel can have a bandwidth of 20 MHz (throughput up
to 130 Mbit/s) or 40 MHz (throughput of up to 300 Mbit/s).
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 with a bandwidth of 20 MHz, 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 be-
tween channels.
With the WLAN Autochannel function, the FRITZ!Box auto-
matically searches for the channel subject to the least inter-
ference. Should problems with interference persist despite
this function, try to identify the source of interference and
switch it off manually.
Additional tips on interference in the WLAN radio network
are presented in the section "Ruling Out Interference
Caused by Other Wireless Networks" from page 102.
The FRITZ!Box can operate in the 5-GHz frequency band as
an alternative. This frequency range is used much less of-
ten than the most common 2.4-GHz frequency range.
128
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