Which step should be taken to ensure the DSL filter is placed correctly?

• A. Be sure the filter is at the right part of the RJ31X jack
• B. Call internet provider
• C. Be sure the filter is at the alarm panel
• D. Verify that it is a DSL filter for alarms

Answer: (A)

The key point is placing the DSL filter at the correct point of entry for the alarm line—the RJ31X jack at the demarcation point. Putting the filter on the side of the jack that feeds the inside alarm wiring isolates the alarm dialer from DSL noise, ensuring reliable communication. If the filter sits elsewhere (like on the alarm panel) it may not effectively isolate the alarm line from the DSL signal. Calling the internet provider isn’t needed for this step, and simply verifying it’s a DSL filter doesn’t guarantee correct placement.