Wireless LAN—Getting Technical
FRITZ!Box 4020
73
In the 2.4-GHz frequency range the European regulation au-
thorities have designated 13 channels for wireless LAN.
A channel can have a bandwidth of 20 MHz (throughput of up
to 216 Mbit/s) or 40 MHz (throughput of up to 450 Mbit/s).
Channels located directly next to each other in the 2.4-GHz
band may overlap and result in mutual interference. For in-
stance, if several wireless networks 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 wireless network, the
channels 6 through 13 can be selected for a second wireless
network. This maintains the minimum distance between
channels.
Should interference in a wireless network persist, the first
step should be to select a different channel.
Wireless Auto Channel
With the wireless auto channel function, the FRITZ!Box auto-
matically searches for the channel subject to the least inter-
ference. This process takes into consideration interference
from radio networks in the vicinity (wireless 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.
Allocation of the Wireless LAN Channels in the 2.4-GHz Range
Channel
Frequency (GHz)
Channel
Frequency (GHz)
1
2.412
8
2.447
2
2.417
9
2.452
3
2.422
10
2.457
4
2.427
11
2.462
5
2.432
12
2.467
6
2.437
13
2.472
7
2.442
