RJ45 and RJ11 connectors
[This message has been edited by bfriend (edited May 10, 2002).]
The line voltage carried for Ethernet over an RJ-45 is much higher and can fry most modems. Fortunately, the standard RJ-11 is a two pair connector, while the RJ-45 is a 4 pair. If you plug an RJ-11 into an RJ-45 plug it will most like make contact with pins 3,4,5, and 6. The voltage for Ethernet is carried on the transmit wires on pins 1 & 2. So the chanceas are you won't accidently fry anything. Not to say that you can't, but you probably won't.