Question: are rj11 and rj45 interchangeable?
Answer: Even though the RJ45 and RJ11 connectors look similar and come from the same RJ family, they should never be thought of as interchangeable. If you plug an RJ11 plug into an RJ45 jack, for example, it can potentially damage the equipment. The RJ45 is commonly used for LAN and ADSL connections.