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WLAN—Getting Technical
monitors the selected channel periodically for higher-priority
users, and, if necessary, switches to a different channel. Note
that the FRITZ!Box waits up to ten minutes, as legally re-
quired, before occupying a free channel. During this period
you cannot register any WLAN devices. The WLAN connection
is then established automatically. For more information, see
the section
A prerequisite for use of the 5-GHz frequency band is that
WLAN devices used in the network support this frequency
range in accordance with the IEEE 802.11a or IEEE 8002.11n
standard.
2.4 GHz or 5 GHz
The FRITZ!Box works in the wireless network either in the
2.4-GHz range or in the 5-GHz range, but not parallel in both
frequency ranges at the same time.
Bandwidth
In both frequency ranges you can select between channel
bandwidths of 20 MHz or 40 MHz (exception: channel 140 in
the 5-GHz frequency band). The FRITZ!Box initially attempts
to select a channel with 40 MHz bandwidth. If this is not pos-
sible due to interference or channels already being used by
other WLANs in the vicinity, the FRITZ!Box automatically
switches temporarily to a bandwidth of 20 MHz. Greater
bandwidth provides for higher data throughput:
Bandwidth (MHz)
20
40
Increasing bandwidths also increases the probability of inter-
ference by wireless networks in the vicinity. Large bandwidths
reduce the frequency range available to other wireless net-
works in the vicinity.
FRITZ!Box 3370
Avoiding WLAN Channels with DFS
Maximum Data Throughput (Mbit/s)
216
450
66
on
page
101.
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