FRITZ!Box 7390 Service - Knowledge Base

FRITZ!Box 7390 Service

"Power" LED flashes

As soon as you connect your FRITZ!Box to your DSL line, the FRITZ!Box establishes a connection to your DSL provider's exchange. This can take up to 10 minutes. During this time, the "Power" LED on the FRITZ!Box flashes. As soon as the DSL connection has been established, it stays lit.

This guide shows you how to resolve the following issues:

  • The FRITZ!Box's "Power" LED flashes continuously.
  • The FRITZ!Box does not establish a DSL connection.

The following error message is displayed in the event log of the FRITZ!Box:

  • "DSL not responding (no DSL synchronization)"

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

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 the error message "DSL not responding" is constantly displayed, or whether the FRITZ!Box establishes an intermittent DSL connection and then only displays the message when the connection drops.
  4. If the message "DSL not responding" is constantly displayed, proceed with the following section.

2 Making sure that the DSL line is supported

3 Selecting the DSL standard in the FRITZ!Box

The following step is only necessary if you are using the FRITZ!Box on an ADSL line:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "DSL Information" in the "Internet" menu.
  3. Click on the "Line Settings" tab. If the tab is not displayed, enable the Advanced View first.
  4. In the "Annex Settings" section, select whether your FRITZ!Box is connected to a DSL line that uses Annex A or Annex B.

    Note:Your DSL provider can tell you whether your DSL line uses Annex A or Annex B. In Germany, all ADSL lines use Annex B.

  5. Click "Apply" to save the settings.

4 Checking the cabling

It is often difficult to recognize mistakes in the cabling and they can remain unnoticed for a long time. Therefore, check the wiring in your home:

  1. Remove the DSL splitter if you are using the FRITZ!Box on an IP-based connection.
  2. Remove all cable extensions, unused cables, telephone jacks, and additional electrical components (for example surge protection, automatic extension outlets).
  3. Make sure that the FRITZ!Box is correctly connected to your DSL line. You will find detailed instructions on the installation poster included with the FRITZ!Box and in the manual.

5 Resetting the interference resistance

Set the control for interference resistance to "Maximum Performance" since otherwise you will not be able to establish a DSL connection with some DSL lines:

Note:The interference resistance should only be changed if your DSL connection is occasionally interrupted (for example due to brief disturbances on the DSL line).

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "DSL Information" in the "Internet" menu.
  3. Click on the "Line Settings" tab. If the tab is not displayed, enable the Advanced View first.
  4. Click on the "Reset Setting" link.
    • Now the interference resistance is automatically set to "Maximum Performance".

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

Installing the latest FRITZ!OS makes your FRITZ!Box compatible with the latest DSL technology used by DSL providers in their DSL exchanges:

7 Checking the DSL line

There may be a problem with the DSL line. Since it may take a while for your DSL provider to check your line, you may be charged for the service, and our experience shows that there is often a problem with DSL lines even if they have been checked by your provider, proceed as follows:

  1. Either: Test whether a different DSL modem works on your DSL line.
    • Or: Test whether the FRITZ!Box can establish a DSL connection on a different DSL line, for example at your neighbor's.

      Note:Only connect the FRITZ!Box to the DSL line and the power mains. A DSL connection was established if the "Power" LED remains lit after no more than 10 minutes.

  2. If a different DSL modem does not work on the line or the FRITZ!Box can establish a DSL connection on a different line, have your provider check your line. There is a problem with the DSL line.

    ATTENTION!You may be charged for checking. Ask your provider about charges in advance!