FRITZ!Box 7390 Service - Knowledge Base

FRITZ!Box 7390 Service

Maximum cable lengths

The FRITZ!Box comes with various cables to connect your FRITZ!Box to your DSL line or connect it to a computer or network hub, for example. If one of these cables is too short you can extend it.

Note:The FRITZ!Box is available in several different product variants, each of which is delivered with different components. For the exact contents of the package, see the information printed on the FRITZ!Box packaging.

1 DSL/telephone cable (Y cable)

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

The following maximum lengths are possible:

  • A maximum of 10 m between the FRITZ!Box and an ISDN-NT.

    Note:If the ISDN-NT is too far away, you can have a technician install an S0 bus that you can connect the ISDN-NT to.

  • A maximum of 100 m between the FRITZ!Box and an analog telephone line.
  • Up to 20 m between the FRITZ!Box and the DSL line; many DSL lines allow greater lengths.

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

2 Network cable

The network cable between the FRITZ!Box and a computer or hub/switch can be up to 100 m in length.

3 Cables for telephony devices

The cable between a telephony device and an analog extension (for example "FON 1") on the FRITZ!Box can normally be up to 100 m in length. However, this depends on the telephony device being used.

The cable between a telephony device and the "FON S0" port on the FRITZ!Box may be up to 10 m in length.

Note:You can also have a technician install an S0 bus which is connected to the "FON S0" port. The ISDN port "FON S0" on the FRITZ!Box must be terminated (two 100 Ohm resistors are switched on the "FON S0" port).

4 Cables for USB devices

The cable of a USB device (for example a printer, mass storage device) connected to the USB port on the FRITZ!Box should not exceed 5 m.