Which describes an alarm digital communicator?

• A. A handheld remote with power switch.
• B. A siren speaker.
• C. A battery backup.
• D. A device like a computer modem attached to the alarm system that passes digital information to a receiver.

Answer: (D)

What a digital communicator does in an alarm system is to attach to the alarm panel and transmit alarm events as digital data to a monitoring receiver. It acts like a modem that sends information over a communication path—phone line, cellular, or IP network—to a central monitoring station, so responders can be alerted remotely. This is distinct from a handheld remote, which is just a local arming/disarming control, a siren speaker that provides audible alerts on-site, or a battery backup that ensures power during outages. The digital communicator’s role is specifically to move digital alarm information to a receiver for monitoring.