FRITZ!Box Fon WLAN 7113
82
Frequency Ranges
2.3
Frequency Ranges
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.
2.4-GHz frequency
band
In the 2.4-GHz frequency band WLAN works in the same
range as Bluetooth, microwave equipment and various
other devices like radio-controlled toys, garage-door
openers and video bridges. This means that interference
may occur within WLANs operated in the vicinity of such
devices. Generallythis has adverse effects on the trans-
mission rate, including aborted connections.
In the 2.4-GHz frequency range the European regulation
authorities have designated 13 channels for WLAN. One
channel 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 in the 2.4-
GHz band may overlap and result in mutual interference.
For instance, if several WLANs are operated close to each
other in the 2.4-GHz frequency 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 main-
tains the minimum distance between channels.
WLAN Autochannel
With the WLAN Autochannel function, the FRITZ!Box auto-
matically searches for the channel subject to the least in-
terference. Should problems with interference persist de-
spite this function, try to identify the source of interfer-
ence and switch it off manually.
Additional tips on interference in the WLAN radio network
are presented in the section “Ruling Out Interference
Cause by Other Wireless Networks” from page 63.
