Fritz! Fon WLAN 7390 Installation, Configuration And Operation page 140

Frequency Ranges
if channel 1 is selected for one WLAN, the channels 6
through 13 can be selected for a second WLAN. This main-
tains the minimum distance between channels.
With the WLAN Autochannel function, the FRITZ!Box auto-
WLAN Autochannel
matically searches for the channel subject to the least in-
terference. This process takes into consideration interfer-
ence from radio networks in the vicinity (WLAN access
points) and potential sources of interference (for instance
video bridges, baby monitors, microwave ovens). 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 113.
The FRITZ!Box can operate in the 5-GHz frequency band as
5-GHz Frequency
Band
an alternative. This frequency range is used much less fre-
quently than the most common 2.4-GHz frequency range.
In the 5-GHz frequency band, your FRITZ!Box occasionally
may change channels automatically due to DFS (Dynamic
Frequency Selection) if a "higher-privileged user" simulta-
neously claims the channel selected by the FRITZ!Box.
This can happen especially when military or civilian radar
is used in the immediate vicinity. For more information,
see the section "Ruling Out Interference Caused by Other
Wireless Networks" on page 113.
A prerequisite for use of the 5-GHz frequency band is that
all WLAN devices in the network support this frequency
range in accordance with the IEEE 802.11a or IEEE
8002.11n standard.
The FRITZ!Box works in the wireless network either in the
2.4 GHz or 5 GHz
2.4-GHz range or in the 5-GHz range. Both frequency rang-
es can be used simultaneously for WLAN connections.
This means you always have the optimum data connection
at your disposal:
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