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"

The speed of the wireless connection (WiFi) to the FRITZ!Box displayed by wireless devices such as computers, smartphones, or tablets, is significantly lower than the data rate allowed by the wireless standard 802.11n. 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 wireless channels it uses in the 2.4 GHz frequency band are in heavy use by other wireless networks. To ensure stable wireless connections, it automatically reduces the channel bandwidth from 40 MHz to 20 MHz. This FRITZ!Box behavior is conform to wireless coexistence, which is part of the wireless standard 802.11n. Although wireless devices then display a lower data rate, the user data rate is increased because there is less interference and the wireless 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.

Simply proceed as described below. After each measure, check whether the problem persists.

1 Automatically configuring wireless channel settings

Configure the following settings so that the FRITZ!Box checks the wireless environment on a regular basis and automatically selects the best wireless channel settings.

  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 wireless connections to the FRITZ!Box are briefly cleared and then automatically reestablished.

2 Establishing a wireless connection to the 5 GHz frequency band

The FRITZ!Box provides a wireless network in the 2.4 GHz as well as the 5 GHz frequency band. The 5 GHz frequency band is less affected by interference. Therefore, switch to this frequency band if your wireless devices support the 5 GHz frequency band:

Note:Not all wireless devices support the 5 GHz frequency band.
FRITZ!WLAN Stick AC 430, FRITZ!WLAN Stick AC 860, and FRITZ!WLAN Stick N (v2) support the 5 GHz frequency band.

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Network" in the "Wireless" ("WLAN") menu.
  3. Enable the option "Wireless radio network enabled" in the "5-GHz Frequency Band" section.
  4. Enter a different name in the field "Name of the wireless radio network (SSID)" so that you can distinguish the 5 GHz wireless network from the 2.4 GHz wireless network in the future. If only one field is displayed, enable the Advanced View first.

    Important:Not all wireless devices support all special characters. Therefore, only use standard alphanumeric characters and not symbols or special letters such as ä, ë, ö, ü, á, é, í in the wireless network name.

  5. Click "Apply" to save the settings.
  6. Establish a wireless connection to the FRITZ!Box wireless network with the name (SSID) that you assigned to the 5 GHz frequency band.

Now wireless connections to the FRITZ!Box are established with the maximum possible data rate.

Note:If the message "Wireless LAN transmission quality increased by reduced channel bandwidth [...]" is still displayed in the event log of the FRITZ!Box, this is due to the heavy use by wireless networks in the vicinity.

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