Two of four jacks don't work
I just moved in to a ten year old house and two of the jacks do not work. I found this when I tried to connect an AT&T wireless modem. I do not have any land line type phones to test with but could borrow one. The jacks are all connected to the blue and blue/white wires. Is there a way to electrically test the jacks or the wires leading to them/ What voltage should I get when they are powered? I suspect that one of the lines in the attic is the problems source.
Thanks
Tom