Operation Manual

Frequency Range
33
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.
The FRITZ!WLAN USB Stick 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
while using the same frequency.
In Europe, 13 channels are provided for WLAN in the 2.4-
GHz range. One channel has a bandwidth of 22 MHz. A 5-
MHz interval is left empty between adjacent channels.
That means that channels located directly next to each
other may overlap and result in mutual interference. If sev-
eral WLANs are operated within a small space, a distance
of at least five channels should be left empty between
each two channels used. For instance, 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
access 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” on page 39.