Lona, don't be insulted by my question, I have to ask as I found a similar fault at work today...
Is the alarm thingy plugged into the telephone line directly or via your ADSL splitter?
One of our sattellite offices had been complaining for ages that their Internet connection was slow and their router often crashed. I checked the software and the hardware but couldn't find a fault. But the router continued to crash and the net was very slow. Then I noticed that someone had installed a panic alram and instead of plugging it into the ADSL splitter, ther had installed a normal phone line splitter and plugged the alarm into one side and the ADSL splitter into the other!
Needless to say, the ADSL splitter is now stuck firmly into the BT wall box with duck tape :heehee: