I was at a customer's office today putting in a server and noticed they recently got an alarm system. Of course I just had to see how they wired the RJ31X. In typical alarm guy fashion, they used the orange pair as the feed from the RJ21X, (which was really just a block with a 25 pair feeding it from the building's phone room, and cables punched down going to the phone system) and the brown pair as the return. They punched it down right on top of the pair of wire coming from the phone system. Gotta love it! I guess it all works but the little things just get me...

Jeff Moss

Moss Communications
Computer Repair-Networking-Cabling