> From: Steve Crocker <steve@xxxxxxxxxxxx> > > I honestly don't remember whether the plugs were the clunky four pin > or the then-modern RJ11. I recall studying RJ11 and RJ45 plugs and > sockets at some point and discovering that some plugs and sockets > had six wires instead of only four or two. I never did learn if > they had a different number. The form factor was the same. Wikipedia has a long list: http://en.wikipedia.org/wiki/Registered_jack It's probably not complete. Dale