FRITZ!Box 7369 Service - Knowledge Base

FRITZ!Box 7369 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.

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 cabling

Mistakes in the cabling can often be overlooked, but they can significantly reduce the DSL speed. Therefore, check the wiring in your home:

  • Make sure that the FRITZ!Box is correctly connected to your DSL line. Remove the following:
    • if you have an IP-based line: the DSL splitter,
    • all cable extensions,
    • unused cables and telephone jacks,
    • additional electrical components (for example surge protection, automatic extension outlets).

2 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:

3 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.
  4. Click on the "Reset Setting" link.
    • The interference resistance is now automatically set to "Maximum Performance".

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 a VDSL or 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, contact your DSL provider.

    ATTENTION!Your DSL provider may charge you for checking your DSL line. Ask your DSL provider about charges in advance!