FRITZ!Box 6890 LTE Service - Knowledge Base

FRITZ!Box 6890 LTE Service
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Mobile connection drops frequently

The mobile connection between your FRITZ!Box and your mobile network operator drops frequently (several times a day). When this occurs, the "Power" LED on the FRITZ!Box flashes and stays lit as soon as the Internet connection has been re-established. The following error message is displayed in the event log of the FRITZ!Box:

  • "LTE no longer responding"

Cause

  • The stability of the mobile connection depends on factors such as the distance from the mobile station and the shielding effect of the walls of your own house. It can also be affected if your mobile network operator is experiencing technical difficulties.

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 Checking the event log of the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Event Log" in the "System" menu.
  3. Check whether events also took place before the time when the error occurred, or whether only events are shown that took place after the error occurred.
  4. If events are also displayed that took place before the time the error occurred, proceed with the following section:

2 Using a different modem version

The software version for the FRITZ!Box's integrated mobile broadband modem undergoes constant development with each FRITZ!OS to ensure that it can establish optimal mobile connections under all circumstances. However, in rare cases the FRITZ!Box may only be able to establish a mobile connection with certain versions. Therefore, test the current and the previous modem version:

Using the latest FRITZ!OS

The modem version is part of FRITZ!OS. Make sure that the FRITZ!Box is using the latest FRITZ!OS and therefore the latest modem version:

Using the previous modem version

If the issue occurs with the latest modem version (for example after updating FRITZ!OS), test the modem version of the previous FRITZ!OS:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "LTE Information" in the "Internet" menu.
  3. Click on the "Reception" tab.
  4. Enable the option "Use previous software version for the integrated mobile communications modem".
  5. Click "Apply setting" to save the settings.

Now the previous modem version is enabled and the modem is reinitialized. Afterwards, the FRITZ!Box attempts to establish a mobile connection again.

3 Selecting the type of mobile communication

Depending on your mobile network operator and contract, if there are several radio cells at your location, you may need to manually select the desired type of mobile communication in the FRITZ!Box:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Click on the "Internet Connection" tab and then on the "Mobile Communications" tab.
  4. In the section "Type of mobile communication", enable the option "Manual" and disable the option "UMTS".
  5. Click "Apply" to save the settings.
  6. If you are now no longer able to connect to the mobile network, re-enable the option "UMTS" and click "Apply".

4 Checking the LTE antennas

Mistakes made when connecting the LTE antennas can often be overlooked. Therefore, check whether the LTE antennas were correctly connected to your FRITZ!Box:

  1. Check the pin in the connector of both LTE antennas. If the pin is bent or has broken off, there can be no contact between the LTE antenna and the FRITZ!Box.
  2. Make sure that both of the LTE antennas included in the package are correctly screwed onto the sockets labeled "LTE" on the FRITZ!Box.
  3. Swap the LTE antennas connected to the two LTE antenna sockets on the FRITZ!Box. Check whether the FRITZ!Box is then able to establish an LTE connection.
  4. If you are using an outdoor LTE antenna, check whether you can establish an LTE connection if you use a different outdoor LTE antenna or a different LTE antenna cable. If you can establish a connection then, either the outdoor antenna or antenna cable is not suitable or is defective.

    Note:If you are using the FRITZ!Box in the indoor coverage area of your LTE provider, test whether you can establish an LTE connection if you use the original LTE antennas included in the package.

5 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 mobile broadband antennas:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "LTE Information" in the "Internet" menu.
  3. Click on the "Reception" tab.
  4. Click the "Start Alignment Aid" button.
    • Now the FRITZ!Box shows the signal strength of both 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.

  5. Select a location for the FRITZ!Box where the value shown is as high as possible. When doing so, note the following:
    1. Do not set up the FRITZ!Box in the corner of a room.
    2. Position the FRITZ!Box as close to an outside wall as possible. If you know where your provider's radio cell is located, position the FRITZ!Box by the wall facing the radio cell.
    3. 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).

6 Connecting an outdoor LTE antenna

The following step is only necessary if you are using the FRITZ!Box in an area located on the edge (outdoor coverage area) of the LTE radio coverage area of your LTE provider:

Note:Internal LTE antennas may not be sufficient for an LTE connection if you are using your FRITZ!Box in the outdoor coverage area of your provider's radio coverage. Your LTE provider can tell you whether you are using the FRITZ!Box in their indoor or outdoor coverage area.

  • Connect an outdoor LTE antenna to the FRITZ!Box.

    Note:If you are using your FRITZ!Box outside of the outdoor coverage area of your LTE provider, outdoor antennas on the balcony or roof may also not be sufficient for your LTE connection.