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Knowledge document #241

Transfer rate of LAN connections to the FRITZ!Box is only 100 Mbit/s

The maximum transfer rate of the LAN connection between the FRITZ!Box and a computer, NAS system, or other devices is 100 Mbit/s, although the device supports gigabit LAN.

Simply proceed as described below. After each measure, check whether the problem is solved.

Note:All instructions on configuration and settings given in this guide refer to the FRITZ!Box 6820 LTE v2 and v3 with the latest FRITZ!OS, the FRITZ!Box 6820 LTE v1 may vary.

1 Adjusting the FRITZ!Box's LAN settings

  1. Click "Home Network" in the FRITZ!Box user interface.
  2. Click "Network" in the "Home Network" menu.
  3. Click on the "Network Settings" tab.
  4. Enable "Power Mode" (1 Gbit/s) for the LAN port.
  5. Click "Apply" to save the settings.

2 Connecting the device directly to the FRITZ!Box

This step is only necessary if the device is connected to the FRITZ!Box by means of a hub/switch, powerline device, LAN/Wi-Fi converter, or other device instead of being connected directly to the FRITZ!Box:

  1. Connect the device directly to a LAN port on the FRITZ!Box. If possible, use the network cable included with the FRITZ!Box.
  2. If you can establish a gigabit LAN connection to the FRITZ!Box now, then the intermediary device or its cabling does not support gigabit LAN:
      1. Make sure that the devices support gigabit LAN.
      2. Update the software / firmware of the devices.
      3. Use different network cables to connect the devices to the FRITZ!Box. Use the shortest possible high-quality network cables (CAT 5e or higher).

3 Testing a different cable

The network cable used to connect the device to the FRITZ!Box may be too long, incorrectly wired, or defective:

  1. Use the shortest possible high-quality network cable to connect the device to the FRITZ!Box, for example use the network cable included with the FRITZ!Box.

    Note:Any standard network cable CAT 5e or higher (STP, 1:1) with a maximum length of 100 m can be used to connect network devices to the FRITZ!Box.

4 Installing the latest software for the device

  1. Install the latest software version for the device or the latest driver for the computer's LAN network adapter.

    Note:Since Windows Update often does not offer the latest drivers, install the drivers from the manufacturer's website, for example from the Intel Download Center.

5 Disabling energy-saving functions for the network adapter

  1. If any energy-saving functions are enabled for the computer's LAN network adapter or the device, disable them for testing purposes.

    Note:In Windows, different power saving functions can be set for many network adapters under "Properties > Power Management" in the Device Manager.

6 Disabling EEE (Energy Efficient Ethernet) in the FRITZ!Box

With EEE, network adapters can be put into an energy-saving standby mode, thus also significantly reducing their average power consumption. Since there may be compatibility issues with individual network adapters when EEE is enabled, disable EEE for testing purposes:

Links "Help and Info" and then "FRITZ!Box Support"
  1. In the FRITZ!Box user interface, click "Help and Info" on the bottom left of the page and then on "FRITZ!Box Support" at the bottom.
  2. Enable the option "Disable EEE (Energy Efficient Ethernet)" in the "Ethernet Compatibility" section.
  3. Click "Apply setting" to save the settings.
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