The L5100 has a built-in phone dialer and can be outfitted with a cellular communicator as a backup in case the internet connection is disrupted.
If the internet communicator stops working, a "103 Comm. Trouble" message will appear on your alarm keypad. Power outages and temporary lapses in network connectivity are often the culprits behind a malfunctioning IP communicator. As soon as power or network signal is restored, the error message will clear away and your L5100 will resume sending alarm signals to your central station.
Although internet communication is fast, it's also unreliable. For that reason, many users choose to outfit their L5100 with a cellular communicator, like theGSMVLP5-4G. Cellular communicators are more reliable, and they provide a backup line of communication to central station.
