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Knowledge document #139

Maximum cable lengths

The FRITZ!Box comes with various cables to connect it to your line, a computer, or hub, for example. If a cable is too short, you can extend or replace it. Since you can only extend cables to a certain limit, below you will find information on the maximum possible length for each type of cable.

1 DSL/telephone cable (Y cable)

Important:You can only extend the short ends of the DSL/telephone cable that are connected to the DSL line and your landline. Signal interference may occur if the common DSL/telephone part of the cable is extended.

The following maximum lengths are possible:

  • A maximum of 100 meters between the FRITZ!Box and analog landline.
  • Up to 20 meters between the FRITZ!Box and DSL line; greater distances are possible with many DSL lines.

    Note:If you are making your own DSL cable, we recommend using CAT 5 UTP network cables.

2 Telephone cable

Normally, the cable between a telephony device and an analog extension on the FRITZ!Box may be up to 100 meters long, but this depends on the telephony device used.

3 Network cable

The network cable between the FRITZ!Box and a connected device may be up to 100 meters long.

Note:Any standard STP-type (Shielded Twisted Pair, 1:1) CAT-5e Ethernet cable can be used to connect a network device to the FRITZ!Box.

4 USB cable

The cable of USB devices connected to the USB port on the FRITZ!Box should be a maximum of 5 meters long.

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