FRITZ!Box 6840 LTE Service - Knowledge Base

FRITZ!Box 6840 LTE Service

LTE throughput is too low

The FRITZ!Box displays the speed of the LTE connection on the user interface under "Internet > LTE Information > LTE " in the "Throughput" line. According to this, the throughput is significantly lower than the speed specified in your LTE service agreement with your LTE provider.


  • The throughput of the LTE connection depends on factors such as the distance from the LTE base station, the shielding effect of the walls of your own house, of neighboring houses, and also trees. Storms and other users located in the same radio cell can also reduce the throughput.

    Important:In many cases, you will not be able to fully achieve the throughput stipulated in your LTE service agreement. Therefore, LTE providers say that they offer speeds of "up to" a certain value.

Important:Some of the settings described here are only displayed if the advanced view is enabled in the user interface. The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS

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

1 Installing the latest FRITZ!OS for the FRITZ!Box

Installing the latest FRITZ!OS makes your FRITZ!Box compatible with the latest LTE technology used by LTE providers in their radio cells:

2 Finding the ideal location for the FRITZ!Box

You can use the alignment aid to find the ideal location for the FRITZ!Box and the best position for the LTE antennas:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Select the frequency band "Only 2.6 GHz / band 7".

    Note:Normally you can achieve a higher data throughput with the 2.6 GHz frequency band than with the 800 MHz frequency band.

  4. Click "Apply" to save the settings.
  5. Click "LTE Information" in the "Internet" menu.
  6. Click on the "Reception" tab.
  7. Click the "Start Alignment Aid" button.
    • Now the FRITZ!Box shows the signal strength for both LTE antennas.

      Note:When the alignment aid is active, the current signal strength is also displayed in a five-level display on the FRITZ!Box LEDs. This means that you can also find the best location for the FRITZ!Box without using the FRITZ!Box user interface.

  8. Select a location for the FRITZ!Box where the value shown is as high as possible. When doing so, note the following:
    • Do not set up the FRITZ!Box in the corner of a room.
    • Position the FRITZ!Box as close to an outside wall as possible.

      Important:If you know where your provider's LTE radio cell is located, position the FRITZ!Box by the wall facing the LTE radio cell.

    • Position the FRITZ!Box so that it is as unobstructed as possible, i.e. not directly in back of or under an obstacle (for example pieces of furniture, heater).
    • Position the LTE antennas of the FRITZ!Box so that they are as perpendicular as possible (90° angle). For example, position one antenna vertically and the other horizontally.
  9. If the quality of the LTE connection in the 2.6 GHz frequency band is not sufficient:
      1. Click "Account Information" in the "Internet" menu.
      2. Select the frequency band "Only 800 GHz / band 20".
      3. Click "Apply" to save the settings.
      4. Click "LTE Information" in the "Internet" menu.
      5. Click on the "Reception" tab.
      6. Start the alignment aid and repeat the adjustment procedure for the FRITZ!Box.

3 Using an outdoor LTE antenna

If you are using the FRITZ!Box in an area located on the edge of LTE radio coverage or in a building that exhibits a strong shielding effect, the two LTE antennas included in the package may not be sufficient for optimal radio traffic. In this case, you can increase the transmission and reception power of the FRITZ!Box if you use an outdoor LTE antenna (for example on your balcony or mounted on your roof) from a specialized vendor:

4 Contacting your provider

Your LTE provider may have throttled the LTE connection if you have exceeded the data usage threshold, or your LTE provider may be experiencing technical difficulties:

  • Have your LTE provider check your LTE connection.