What is the most commonly used method for alarm system to communicate to the Central Station?

• A. Internet
• B. Telephone Line
• C. Cellular Network
• D. Radio Frequency

Answer: (B)

The most common way an alarm system reports to the Central Station is through a telephone line. This uses the established landline path from the protected premise to the monitoring center, which has made it the standard in monitoring for many years. It’s simple to install, widely compatible with central stations and monitoring contracts, and doesn’t depend on newer technologies that may not be available in every location.

Cellular and IP (internet) options are increasingly used, but mainly as backups or in newer installations, because cellular coverage can vary and data plans add cost, while internet-based signaling depends on a reliable broadband connection and power to the router. Radio frequency signaling is less common as a primary path due to regulatory, interoperability, and coverage considerations.