FRITZ!Box 3272 – Service - Knowledge Base

FRITZ!Box 3272 – Service

DSL throughput is too low

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

Cause

  • The throughput of the DSL connection primarily depends on the length and quality of the access line. Faults in the cabling or problems with the internet service provider's exchange (DSLAM) can also affect it.

    Note:With many DSL lines, you will not be able to fully achieve the guaranteed throughput. Therefore, DSL providers say that they offer DSL speeds of "up to" a certain value.

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 cabling

Mistakes in the cabling can often be overlooked, but they can significantly reduce the DSL speed. 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.

2 Resetting the interference resistance

Set the controls for interference resistance to "Maximum Performance" since any other setting can have a negative effect on the speed of the DSL connection:

  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".

3 Using a different DSL version

The DSL version of the FRITZ!Box undergoes constant development with each FRITZ!OS to ensure that it can establish optimal DSL connections under all circumstances. In individual cases (for example on DSL lines with outdated DSLAMs) the FRITZ!Box may be able to negotiate higher data rates with certain DSL versions. Therefore, test the current and the previous DSL version:

Using the latest FRITZ!OS

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

Using the previous DSL version

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

  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. Enable the option "Use previous DSL version".
  5. Click "Apply" to save the settings.

Now the previous DSL version is enabled and the FRITZ!Box is restarted. The restart will take about two minutes. If the problem no longer occurs then, please send us brief feedback on your FRITZ!Box's synchronization method under "Internet > DSL Information > Feedback".

4 Checking the DSL line

Determining the maximum possible throughput

DSL providers set a maximum achievable throughput for each DSL line. The speed that can actually be achieved on your DSL line cannot be higher than this maximum throughput:

Note:The maximum throughput can only be displayed on the user interface if you have an ADSL2+ line.

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "DSL Information" in the "Internet" menu.
  3. Click on the "DSL" tab.
  4. Check the "Max. DSLAM throughput" line to see the maximum throughput set for your line.
  5. If a higher speed is specified in your DSL service agreement with your DSL provider, contact your DSL provider.

Testing the speed with a different DSL modem

With many DSL lines, you will not be able to fully achieve the speed guaranteed by your DSL provider. To check whether the speed you achieve is limited by your DSL line or whether it is due to a technical issue, use a different DSL modem to test the speed:

Important:Test the other modem soon after you finish testing the FRITZ!Box to ensure that you test it under the same conditions.

  1. Disconnect the FRITZ!Box from the DSL line.
  2. Connect a different DSL modem to the DSL line.
  3. Test which DSL speed you achieve with the other DSL modem.
  4. If the speed you achieve with the other DSL modem is also significantly lower than the speed agreed on with your provider, have your provider check your line.

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