What is a defining feature of a Remote Station Alarm System?

The defining feature of a Remote Station Alarm System is that it transmits signals over a leased telephone line. This type of system is designed to send alarm signals from a remote location, such as a building that is not staffed continuously, directly to a monitoring station or fire department. By utilizing a leased telephone line, the system ensures reliable and continuous communication of alarms and alerts, which is essential for prompt emergency response.

Other features, such as using municipal fire alarm circuits, locating the system off-site, or automatically retraining signals, do not specifically characterize a Remote Station Alarm System. Instead, those aspects might pertain to different types of alarm systems or configurations. The emphasis on leased telephone lines highlights the method of communication critical for remote monitoring and alerting, which is what distinguishes this type of alarm system from others.