We have an ADT monitored alarms system installed in 2001 and I am trying to put a DSL filter on to the line. The phone line for the alarm box seems to be wired strangly.
6 wires coming into the back from the telephone junction (Red, gree, blue, white, black and yellow). But only the Red, Green, Black and White wires are actively hooked into the junction.
Now for the strangeness, usually I think, the red and the green lines are the two wires you need to get a dial tone on a phone. But in this system you only get a dial tone on the wires form the junction using the red and the black wires. To make it even weirder, if you directly connect the 4 active wires red to red, black to black, green to green and white to white (and tie off the yellow and blue ones) you get a dial tone on the red and black pair as before, but also on the green and white pair! so you get 4 wires and two dial tones? is this usual?
I believe that our system is hooked up so that it will override any regular phone call you are on in order to dial through to the control center. If this is the case does this mean that all 4 wires are needed in this phone line? which would kind of make my 2 wire DSL filter from Excelcius kinda useless...
Is anyone familiar with this kind of monitored alarm set up?