Operating Instructions and Installation Instructions

Cannot Establish a WLAN Connection
FRITZ!Box 3370 101
Avoiding WLAN Channels with DFS
The FRITZ!Box loses the WLAN connection in the 5-GHz
frequency band for no apparent reason.
A forced channel change is taking place. In the 5-GHz fre-
quency band the WLAN base station is programmed to
change the channel whenever a radar source transmits on the
same channel (Dynamic Frequency Selection, DFS).
You can prevent forced channel changes by selecting in the
FRITZ!Box a channel for the 5-GHz frequency band that does
not use DFS (channels 36, 40, 44, 48).
Ruling Out Interference from Other Wireless Networks
If there are other devices in the immediate vicinity of your
FRITZ!Box that use the same frequency band, mutual interfer-
ence and interrupted connections can occur. Devices that can
cause disruptions include other WLAN base stations, baby
monitors, game consoles, garage door openers, Bluetooth
devices, or wireless AV bridges, which also use the 2.4-GHz
frequency band.
If such devices are located in the vicinity of the FRITZ!Box,
test a different radio channel for the FRITZ!Box or switch the
radio channel setting to “Autochannel”. Then the FRITZ!Box
will automatically set the best WLAN channel for transmis-
sion.
For applications that rely on a high throughput rate (“stream-
ing”), you should use the 5-GHz frequency band. This fre-
quency band provides more channels and is subject to signif-
icantly less external interference.
1. Connect a computer to the FRITZ!Box with a network ca-
ble (see page 17).
2. Open the FRITZ!Box user interface (see page 26).
3. Select “WLAN / Radio Channel”.
Cause
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