Which type of jack should be used to connect a digital communicator?

The RJ-31X jack is specifically designed for connecting digital communicators and is commonly used in alarm systems. It allows for the integration of the alarm panel with a phone line, enabling effective communication between the alarm system and monitoring services.

The RJ-31X jack serves a crucial role; it provides a way for the alarm system to seize the phone line during an alarm condition, ensuring that the system can send signals or alerts without interference from other devices that might normally use the phone line. This capability is critical for maintaining the integrity and reliability of alarm communications.

In contrast, the RJ-11 is typically used for standard telephone connections, while the RJ-45 is used primarily for Ethernet and network connections. The RJ-12 is a variation of the RJ-11, which can be used for telephone applications but does not provide the same functionality required for alarm communicators. Thus, the design and function of the RJ-31X make it the appropriate choice for ensuring effective communication of alarm signals.