AVM Fritz!Box 3490, Руководство по конфигурации и эксплуатации

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FRITZ!Box 3490 94
Wireless LAN—Getting Technical
FRITZ!Box supports the AES encryption procedure as part of
the WPA2 mechanism, and the TKIP encryption procedure as
part of the WPA mechanism. This means that the FRITZ!Box
can be used in combination with any wireless devices that al-
so support WPA2 with AES or WPA with TKIP.
Frequency Ranges
Wireless LAN uses the frequency ranges at 2.4 GHz and 5 GHz
for transmission.
With the FRITZ!Box 3490 you can establish wireless LAN con-
nections in both frequency ranges at the same time.
2.4-GHz Frequency Band
In the 2.4-GHz frequency band wireless LAN works in the
same range as Bluetooth, microwave devices and various
other devices like radio-controlled toys, garage-door openers
and video bridges. This means that interference may occur
within wireless networks operated in the vicinity of such de-
vices. Generally this has adverse effects on the transmission
rate, including aborted connections.
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.