ECN Forum Forums General Topics of the Trade General Discussion Area Taking readings from a telephone line?

Scott,

I started out my career installing burglar/fire alarms and we had one type of a system called a "BA" alarm. The central office would send out 130 volts DC over the phone line to our control box. The readings you got back told us if the alarm was off/on/ or in alarm. That 130 VDC would really sting if you got nailed by it.

Harold