Two benefits of CID?

• A. Cost effective and more information can be sent.
• B. Higher cost but simpler signals.
• C. Slower transmission.
• D. Requires less compatibility.

Answer: (A)

CID signaling uses a standardized set of event codes to report alarm conditions over telephone or IP lines. The main advantage is cost efficiency: it relies on widely supported infrastructure and does not require expensive, custom signaling hardware or protocols. At the same time, it can carry a lot of information in one transmission—such as the exact event type, the zone or location, and device status—so the monitoring center can interpret and respond quickly without back-and-forth communication. This combination—saving money while delivering rich, actionable data—makes CID a practical choice for alarm systems. The other options don’t fit because CID isn’t about higher cost or simpler signals, it doesn’t inherently slow transmission, and it actually promotes broad compatibility rather than requiring less of it.