I had to connect a Fritz box with a fax machine. There were on both devices RJ11 sockets and the two Devices were a total of 20 meters of each other in two different floors. Was in an empty pipe a network cable with RJ 45 connectors. I could now connect the reducer adapter with the RJ45 socket with the network cable and (or Fritz box, fax) the RJ11 connector of Reducing adapter into the respective device plug and the connection was made. This was spared me that I remove the network cable from the superficial and simple Had to move phone cord.
