The RJ31X jack interfaces the digital communicator with the telephone line. Which description best matches its role?

The RJ31X jack interfaces the digital communicator with the telephone line. Which description best matches its role?

• A. Interface to Power Supply
• B. Interface to the Internet
• C. Interface to the Door Sensor
• D. Interface Between the Digital Communicator and the Telephone Line

Answer: (D)

The RJ31X jack is the connection point that links the alarm panel’s digital communicator to the home’s telephone line. Its role is to provide a proper interface so the panel can access the telephone network and seize the line to dial out to the monitoring center when an alarm occurs. This keeps the alarm’s call from being interrupted by normal house phones and ensures the panel can reliably transmit the signal. It does not relate to powering the system, connecting to the Internet, or interacting with door sensors, which is why the description that mentions it as the interface between the digital communicator and the telephone line is the correct fit.

The RJ31X jack is the connection point that links the alarm panel’s digital communicator to the home’s telephone line. Its role is to provide a proper interface so the panel can access the telephone network and seize the line to dial out to the monitoring center when an alarm occurs. This keeps the alarm’s call from being interrupted by normal house phones and ensures the panel can reliably transmit the signal. It does not relate to powering the system, connecting to the Internet, or interacting with door sensors, which is why the description that mentions it as the interface between the digital communicator and the telephone line is the correct fit.