1. the phone with a cable welsches on one side a RJ11 connector on the other side a J45 connector has stuck to the network socket.
The RJ11 connector (which is the small connector) comes to the phone. The RJ45 connector (This is the great connector) connects your to the network socket.
2. Now comes Trick 17) as where the other end of the network cable welsches leads from the network socket to the switch you stick it to the adapter, the side with the RJ11 plug into the RJ11 socket must connect to the Fritz box, this is then FON1 or fon2 according as welsche their benefits.
Enjoy implement :)