The cable wires for DSL lead from the middle pins 4 and 5 of the plug on the single cable end to the middle pins 4 and 5 of the (gray) DSL plug at the split end of the cable (see fig.).

Note:If you hold an RJ45 plug so that the cable clip on the plug is pointing down and the golden pins are showing upwards and towards you (see fig.), pin 1 is on the right-hand side, and pin 8 on the left-hand side.

The cable wires for landline telephony (ISDN/analog) lead from pins 1, 2, 3, 6, 7 and 8 of the plug on the single cable end to pins 4, 5, 1, 8, 3 and 6 of the black telephone plug at the split end of the cable (see fig.).

Fig.: Assignment of the DSL/telephone cable

The cables of ISDN devices connected to the "FON S0" socket on the FRITZ!Box must be assigned as follows:

Note:You can have a technician install an S0 interface connected to the "FON S0" socket. The "FON S0" socket is terminated (two 100 Ohm resistors are switched on the "FON S0" socket in the FRITZ!Box).

Fig.: Assignment of the ISDN cable

The two middle pins 3 and 4 are assigned on the RJ11 sockets.