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Dokument informacyjny #3600
FRITZ!Box 5590 Fiber
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FRITZ!Box does not establish a fiber optic connection

Although the FRITZ!Box was configured for use with a fiber optic line, the FRITZ!Box does not establish a fiber optic connection. The message "Fiber optics interrupted" is displayed on the "Overview" page of the FRITZ!Box user interface. The message "Fiber optic cable not connected" may be displayed in the fiber optic information of the FRITZ!Box.

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

1 Checking the SFP module

The FRITZ!Box is available in several different product variants, each of which is delivered with different components. If there was no SFP module inserted in your FRITZ!Box, perform the following steps:

  1. Insert the SFP module that is suitable for your fiber optic connection into the SFP slot of the FRITZ!Box:
    1. If you have an active fiber optic connection (AON), insert the SFP module "FRITZ!SFP AON" into the SFP slot of the FRITZ!Box.
    2. If you have a passive fiber optic connection (GPON), insert the SFP module "FRITZ!SFP GPON" into the SFP slot of the FRITZ!Box.
    3. If you have a passive fiber optic connection according to XGS-PON, insert the SFP module "FRITZ!SFP XGS-PON" into the SFP slot of the FRITZ!Box.
      Inserting the SFP module into the FRITZ!Box

      Important:If you do not know what kind of fiber optic connection you have, test both of the SFP modules supplied with the FRITZ!Box. The Power/Fiber LED on the FRITZ!Box remains lit as soon as the FRITZ!Box is connected to the fiber optic connection using the correct SFP module.

2 Checking the cabling

  1. Remove all cable extensions and adapters between the FRITZ!Box and the fiber optic socket.
  2. Use an undamaged cable to connect the FRITZ!Box with the fiber optic socket. The fiber optic cable may not have any kinks or be damaged.

    Note:The SFP modules included with the FRITZ!Box have LC/APC sockets. If your fiber optic socket has a different type of socket, use the corresponding adapter or cable with different plugs on both ends. Normally the cable length in the home does not matter.

3 Installing the latest FRITZ!OS for the FRITZ!Box

Install the latest version of FRITZ!OS because it contains improvements for different fiber optic connections that can resolve the error:

  1. Install the latest FRITZ!OS on the FRITZ!Box.

4 Unlocking your FRITZ!Box

If you purchased your FRITZ!Box from a retailer, your internet service provider may have to unlock it first:

  1. Contact the customer service of your internet service provider and have them unlock the FRITZ!Box for your fiber optic connection, if necessary. Depending on the provider, you can either call their customer service or use an activation portal to activate it.
    • With some providers, the "modem ID" on the bottom of the FRITZ!Box is required to unlock it:
      Modem ID on the bottom of the FRITZ!Box
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