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Knowledge document #522
FRITZ!Box 7340
This support document is available for the following products:
- FRITZ!Box 7590 AX
- FRITZ!Box 7590
- FRITZ!Box 7583 VDSL
- FRITZ!Box 7583
- FRITZ!Box 7582
- FRITZ!Box 7581
- FRITZ!Box 7560
- FRITZ!Box 7530 AX
- FRITZ!Box 7530
- FRITZ!Box 7520
- FRITZ!Box 7510
- FRITZ!Box 7490
- FRITZ!Box 7430
- FRITZ!Box 7390
- FRITZ!Box 7369
- FRITZ!Box 7360
- FRITZ!Box 7330
- FRITZ!Box 7272
- FRITZ!Box 6890 LTE
- FRITZ!Box 6850 5G
- FRITZ!Box 6850 LTE
- FRITZ!Box 6840 LTE
- FRITZ!Box 6820 LTE
- FRITZ!Box 6810 LTE
- FRITZ!Box 6690 Cable
- FRITZ!Box 6670 Cable
- FRITZ!Box 6660 Cable
- FRITZ!Box 6591 Cable
- FRITZ!Box 6590 Cable
- FRITZ!Box 6490 Cable
- FRITZ!Box 6430 Cable
- FRITZ!Box 5590 Fiber
- FRITZ!Box 5530 Fiber
- FRITZ!Box 5491
- FRITZ!Box 5490
- FRITZ!Box 4060
- FRITZ!Box 4040
- FRITZ!Box 4020
- FRITZ!Box 3490
- FRITZ!Box 3390
- FRITZ!Box 3370
- FRITZ!Box 3272
- FRITZ!Repeater 6000
- FRITZ!Repeater 3000 AX
- FRITZ!Repeater 3000
- FRITZ!Repeater 2400
- FRITZ!Repeater 1750E
- FRITZ!Repeater 1200 AX
- FRITZ!Repeater 1200
- FRITZ!WLAN Repeater 1160
- FRITZ!Repeater 600
- FRITZ!WLAN Repeater 450E
- FRITZ!WLAN Repeater 310
- FRITZ!WLAN Repeater DVB-C
- FRITZ!Powerline 1260
- FRITZ!Powerline 1260E
- FRITZ!Powerline 1240 AX
- FRITZ!Powerline 1240E
- FRITZ!Powerline 546E
- FRITZ!Powerline 540E
FRITZ!Box reports "Wi-Fi transmission quality increased by reduced channel bandwidth"
The following message is displayed in the event log of the FRITZ!Box:
- "Wi-Fi transmission quality increased by reduced channel bandwidth (2.4 GHz)"
Cause
- In environments with many other 2.4 GHz Wi-Fi networks, the FRITZ!Box automatically reduces the channel bandwidth in the 2.4 GHz Wi-Fi network from 40 MHz to 20 MHz. By temporarily reducing the channel bandwidth, Wi-Fi connections in the 2.4 GHz Wi-Fi network are disturbed less and the user data rate of the connections is increased.
1 Selecting the best Wi-Fi channel
In the factory settings, the FRITZ!Box automatically checks the Wi-Fi environment and selects the Wi-Fi channel settings. However, with some disturbances it cannot determine the best Wi-Fi channel for all wireless devices. Therefore, select the Wi-Fi channel in the FRITZ!Box that is least affected by interference in the Wi-Fi environment:
- Click "Wi-Fi" ("Wireless") in the FRITZ!Box user interface.
- Click "Wi-Fi Channel" ("Radio Channel") in the "Wi-Fi" ("Wireless") menu.
- Click the link "Show disturbances to wireless network" in the section "Wi-Fi environment".
- Use the diagram to determine which channel in the lower frequency range is least affected by other Wi-Fi networks and interference.
- Enable the option "Adjust Wi-Fi channel settings" ("Adjust radio channel settings") in the section "Wi-Fi Channel Settings".
- From the drop-down list "Radio channel", select the Wi-Fi channel that was the least affected.
- Click "Apply" to save the settings.
- If the issue with your Wi-Fi connection still occurs, repeat steps 3 - 7 with a Wi-Fi channel in the middle and then with one in the higher frequency range. Then, use the Wi-Fi channel with the least interference.
Important:The diagram of the Wi-Fi environment only reflects the current situation! The allocation of the frequency band can change significantly over the course of the day because many Wi-Fi networks are turned on when in use. Therefore, check several times to see which Wi-Fi channels are least affected by interference.