To the knowledge base

Setting up the FRITZ!Box for use with a fiber optic connection

You want to use the FRITZ!Box with a fiber optic modem? ✔ It's easy with this guide.

Not only can you use your FRITZ!Box with an integrated DSL modem on a DSL line, you can also use it with an additional fiber optic modem on a fiber optic connection (Fiber to the Home, FTTH).

Since the FRITZ!Box establishes and controls its own internet connection over the fiber optic modem, all FRITZ!Box functions (such as firewall, telephony) are also available without restriction in this operating mode.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Connecting FRITZ!Box with the fiber optic modem

  1. Insert one end of a network cable into the "LAN 1" port on the FRITZ!Box. Use the network cable supplied with the FRITZ!Box, for example.
  2. Insert the other end of the network cable into the LAN port on the fiber optic modem (ONT, Optical Network Termination).

2 Configuring the internet connection in the FRITZ!Box

Configuring the Telekom internet connection

These steps are only necessary if you are using the FRITZ!Box on a fiber optic line from Deutsche Telekom:

  1. Open the FRITZ!Box user interface.
  2. Enter the password given on the type label of the FRITZ!Box and click "Log In".
  3. If the wizard for internet access does not start automatically, click "Wizards" and then "Configure the Internet Connection".
    Calling up the FRITZ!Box wizard
  4. In the wizard, select "Telekom" from the drop-down list.
  5. Enable the option "EMPFOHLEN: Automatische Einrichtung des Internetzugangs [...]" in the section "Telekom Glasfaser-Anschluss". If you are not offered setup via EasySupport:
    1. Enable the correct connection type and click "Next".
    2. Enter the account information you received from Telekom in the relevant fields.
  6. Click "Next" and follow the wizard's instructions.

Configuring the internet connection of a different provider

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Check whether your internet service provider is displayed in the drop-down list in the "Internet Service Provider" section. If your provider is not displayed, select "more internet service providers" first.
    • If your internet service provider is displayed in the drop-down list:
      1. Select your internet service provider.
      2. If account information is required, enter the account information you received from your internet service provider in the corresponding fields.
      3. Click "Change connection settings".
      4. Enable the option "Via an external modem" in the "Internet connection" section, if this option is displayed.
    • If your internet service provider is not displayed in the drop-down list:
      1. Select "other internet service provider".
      2. Enable the option "Connection to an external modem or router" in the "Connect via" area.
      3. Enable the option "Establish own connection to the internet" in the section "Operating Mode".
      4. If account information is required, enter the account information you received from your internet service provider in the corresponding fields.
        • If account information is not required, enable the option "No" in the "Account Information" section.
      5. If your internet service provider requires you to use a particular VLAN ID, click "Change Connection Settings", enable the option "Use VLAN for internet access", and enter the VLAN ID.
  4. Enter the speeds of your internet connection in the "Downstream" and "Upstream" fields.
  5. Click "Apply" to save the settings.

Now the FRITZ!Box uses the account information you entered to establish the internet connection. Then you can configure your telephone numbers in the FRITZ!Box and connect your wireless devices with the FRITZ!Box.

3 Setting up telephony in the FRITZ!Box

If you want to connect telephones to the FRITZ!Box and use them to make calls over the internet:

  1. Configure the internet telephone numbers in the FRITZ!Box.