FRITZ!Box 7581 Service - Knowledge Base

FRITZ!Box 7581 Service
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Since updating FRITZ!OS, "Power" LED flashes

Since updating FRITZ!OS, the FRITZ!Box can no longer establish a DSL connection. The FRITZ!Box's "Power" LED flashes continuously since the update and 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 problem persists.

1 Restarting the FRITZ!Box

  • Unplug the FRITZ!Box for 5 seconds.

    Note:The FRITZ!Box settings remain intact. The restart will take about 2 minutes. During this time, you cannot access the FRITZ!Box.

2 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 message "DSL not responding" is displayed constantly or only when the DSL connection drops.
  4. If the message "DSL not responding" is constantly displayed, proceed with the following section.

3 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 the "Reset Setting" link.
    • Now the interference resistance is automatically set to "Maximum Performance".