FRITZ!Box 7430 Service - Knowledge Base
Pin assignment of cables and ports
The FRITZ!Box has various ports for connecting it to your DSL line and connecting your telephony devices to it. Here you will find the pin assignment of the cables included with delivery and the FRITZ!Box port so you can use your own cables, for example.
1 DSL cable (RJ45/RJ11)
Pins 4 and 5 of the RJ45 plugs must be assigned. Pins 3 and 4 of the RJ11 plugs must be assigned. Since the order does not matter, they cannot be accidentally swapped.
2 RJ11 socket of "FON" extension
The RJ11 socket "FON" only uses the two middle pins.