What is the difference between an alarm, rouble, and supervisory signal?
• ALARM SIGNALS- normally means an alarm condition of some kind. Normally means that the fire authorities are going to be dispatched and the customer notified. The on premise notification appliances (NAC’s) will be sounding. These alarm signals are sent to the central station by the alarm control accompanied with additional information such as what zone etc. • TROUBLE SIGNALS- normally means that there is some kind of trouble with the alarm system or one or more of it’s components. Normally does not result in the authorities being dispatched, as there is no actual fire, just a problem. Usually results in a notification at the premise (beeping keypad, flashing LED’s etc.) and a call to the customer. Examples- low battery, broken wiring, dirty smoke detector, A/C power failure, etc. There is one kind of trouble signal that a system cannot send unless it has a back-up transmission path, and that is a phone line failure (hence the two telephone rule for fire alarm systems). • SUPERVISORY S
