FRITZ!Box 6810 LTE Service - Knowledge Base

FRITZ!Box 6810 LTE Service

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

Computers, smartphones, or other wireless devices display a low speed for the wireless connection (WiFi) 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 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.

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.

1 Finding the ideal location for the FRITZ!Box

  1. If possible, place the FRITZ!Box in a central location. 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 coverage area of the wireless signal. Metallic objects or objects containing water, for example radiators, refrigerators, or even houseplants, significantly reduce the quality of the wireless signal.
  6. Place the FRITZ!Box away from other radio transmitters, for example microwaves, wireless speakers, or Bluetooth devices.

2 Selecting the best wireless channel

In the factory settings, the FRITZ!Box automatically checks the wireless environment and selects the wireless channel settings. However, with some disturbances it cannot determine the best wireless channel for all wireless devices. Therefore, select the wireless channel in the FRITZ!Box that is least affected by interference in the wireless environment:

  1. Click "Wireless" ("WLAN") in the FRITZ!Box user interface.
  2. Click "Radio Channel" in the "Wireless" ("WLAN") menu.
  3. Click the link "Show disturbances to wireless network" in the "Wireless Environment" section.
  4. Use the diagram to determine which channel in the lower frequency range is least affected by other wireless networks and interference.
  5. Enable the option "Adjust radio channel settings" in the "Radio Channel Settings" section.
  6. From the drop-down list "Radio channel", select the wireless channel that was the least affected.
  7. Click "Apply" to save the settings.
  8. If the issue with your wireless connection still occurs, repeat steps 3 - 7 with a wireless channel in the middle and then with one in the higher frequency range. Once you have finished testing, use the wireless channel that was least affected by disturbances.

    Important:The diagram of the wireless environment only reflects the current situation! The allocation of the frequency band can change significantly over the course of the day because many wireless networks are turned on when in use. Therefore, check several times to see which wireless channels are least affected by interference.

Now the FRITZ!Box automatically selects the best wireless 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 wireless channels in the 2.4 GHz frequency band are in heavy use by adjacent wireless networks.