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Knowledge Base document #522

FRITZ!Powerline reports 'Wi-Fi transmission quality increased by reduced channel bandwidth'

The following message is displayed in the event log of the FRITZ!Powerline device:

  • '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!Powerline device 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 Optimizing the FRITZ!Powerline device's Wi-Fi settings

Configuring the FRITZ!Box

The following steps are necessary only if you are using a FRITZ!Box as the wireless router and you adjusted the Wi-Fi settings of the FRITZ!Box:

Note:In the factory settings, the FRITZ!Box already uses the ideal Wi-Fi settings, evaluates the Wi-Fi environment and the quality of the connection of the wireless devices connected to it at regular intervals, automatically selects the current ideal Wi-Fi channel settings, and steers wireless devices to whichever Wi-Fi network is best.

  1. Set up the FRITZ!Box as described in the guide Optimizing the Wi-Fi network of the FRITZ!Box.

Setting up the router

The following steps are necessary only if you are using a router from another manufacturer:

Note:Refer to the manufacturer of the router for information on setting it up; for example, consult the manual.

  1. If the wireless router can provide the 2.4-GHz and 5-GHz frequency bands at the same time:
    1. Enable the 2.4-GHz and 5-GHz Wi-Fi networks on the wireless router:
    2. If the wireless router can automatically steer the wireless devices connected to it into the ideal frequency band ('band steering'), enable the corresponding option.
    3. If the wireless router has a 'Zero Wait DFS', 'Always on DFS' option or similar option for uninterrupted use of the 5-GHz Wi-Fi network, enable it. This allows the wireless router's 5-GHz Wi-Fi network to be used even while the Wi-Fi environment is being checked for radar systems (for example for weather service, air traffic control, and the military).
  2. If possible, configure Wi-Fi channels without interference in both the 2.4-GHz and the 5-GHz Wi-Fi network in the wireless router. If you can configure the wireless router so that it automatically selects the best Wi-Fi channel settings, enable this option.
  3. Configure the wireless router so that its Wi-Fi transmits at maximum power.
  4. Give the wireless router a unique Wi-Fi network name (SSID). This prevents your wireless devices from trying to connect to the wrong wireless router if there are Wi-Fi networks with the same name in the vicinity.

    Note:All Wi-Fi connections are cleared when you change the Wi-Fi network name. You must then reconfigure the Wi-Fi connections.

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