FRITZ!Box 7390 Service - Knowledge Base

FRITZ!Box 7390 Service
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FRITZ!Box reports "Wireless LAN transmission quality increased by reduced channel bandwidth"

Computers, smartphones, or other wireless devices display a low speed for the Wi-Fi connection to the FRITZ!Box's 2.4 GHz frequency band displayed. The following message is displayed in the event log of the FRITZ!Box:

  • "Wireless LAN transmission quality increased by reduced channel bandwidth (2.4 GHz)"

Cause

  • The FRITZ!Box recognizes when the Wi-Fi channels it uses in the 2.4 GHz frequency band are in heavy use by other Wi-Fi networks. To ensure stable Wi-Fi connections, it automatically reduces the channel bandwidth from 40 MHz to 20 MHz. This FRITZ!Box behavior is conform to wireless coexistence.

Although wireless devices then display a lower data rate, the user data rate is increased because there is less interference and the Wi-Fi connection is no longer affected by constant retransmissions.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Automatically configuring Wi-Fi channel settings

In the factory settings, the FRITZ!Box evaluates the Wi-Fi environment and the quality of the connection of the wireless devices on a regular basis. Based on this evaluation, it automatically selects the best Wi-Fi channel settings. If you disabled the automatic adjustment of Wi-Fi channel settings, enable them again:

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Channel" in the "Wireless" ("WLAN") menu.
  3. Enable the option "Set radio channel settings automatically (recommended)".
  4. Click "Apply" to save the settings. Now Wi-Fi connections to the FRITZ!Box are briefly cleared and then automatically re-established.

2 Finding the ideal location for the FRITZ!Box

  1. If possible, place the FRITZ!Box in a centrally located room. The FRITZ!Box has omnidirectional antennas. The wireless signal is therefore emitted spherically in all directions.
  2. Do not place the FRITZ!Box directly in the corner of a room.
  3. Place the FRITZ!Box so that it is as unobstructed as possible, i.e. not directly in back of or under an obstacle such as pieces of furniture or a heater.
  4. Place the FRITZ!Box as high in the room as possible, for example on a shelf.
  5. Place the FRITZ!Box so that there are as few obstacles as possible between it and the wireless devices. Even small objects in the immediate vicinity of your FRITZ!Box can greatly reduce the range of the wireless signal. Metallic objects or objects containing water, such as radiators, refrigerators, or even houseplants, significantly reduce the quality of the wireless signal.
  6. Place the FRITZ!Box away from other radio transmitters, such as microwaves, wireless speakers, or Bluetooth devices.

Now the FRITZ!Box automatically selects the best Wi-Fi channel settings. If the message "Wireless LAN transmission quality increased by reduced channel bandwidth (2.4 GHz)" is still displayed in the event log of the FRITZ!Box, this is because all of the Wi-Fi channels in the 2.4 GHz frequency band are in heavy use by adjacent Wi-Fi networks.

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