DSL Internet Can Interfere With Your Alarm Signal!
A DSL Filter for alarm systems.
What Do I Need To Do To Solve The Problem?

You need to call your alarm company, and have them install a DSL filter that is compatible with their alarm equipment.  Installation of a DSL filter requires the temporary disconnection of your alarm panel, and a full system test afterwards.  This test is necessary to verify that the alarm filter is installed properly, and that all systems are functioning as they should.

A DSL filter can be installed quickly and with minimal cost to you. A standard filter can cost anywhere from $30 to $100 installed, depending on your alarm service provider.
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Professional DSL Filter.
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If you have recently upgraded to a DSL (Digital Subscriber Line) internet connection at your home or business, your alarm panel may have difficulty sending vital signals to your alarm company's emergency response center.  Fortunately, there is a simple and low cost solution available to you.
What Is DSL?

DSL (also known as "Broadband" connection) is a premium service offered by most internet service providers.  It sends and receives data from the internet at higher speeds,  using the high frequency spectrum of your telephone line.  The lower frequency of the same line is used for your regular voice calls.  This enables you to surf the net and talk on the phone at the same time.  DSL is an "always on" connection, meaning that you are always connected to the internet, even if your computer is switched off.
Above:
DSL and home security monitoring don't always work well together.
How Does DSL Interfere With My Alarm System's Signal?

This constant stream of information to and from the internet can interfere with your alarm panel's internal modem, disrupting the data communications between the panel and the emergency response center.  Thus, the alarm panel is stopped from communicating reliably with the emergency response center to report events.  Since the alarm panel is an analog telephone device, it needs to be filtered from the DSL to work properly.
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