Asymmetric digital subscriber line (ADSL) is a type of high speed Internet connection that uses existing telephone infrastructure to deliver Internet service. Telephone equipment like phones and fax machines aren’t designed for ADSL signals. As a result, phones can interfere with Internet connections and vice versa. ADSL micro filters were created to keep normal phone signals and ADSL separated, even though they are running on the same wires. ADSL micro filters are installed between telephones and your phone jack.
ADSL filters prevent your Internet signal from interfering with the voice part of your phone line. When ADSL interference occurs, it typically sounds like a series of fast clicks. ADSL filters also ensure that your lines are terminated correctly by preventing signal reflections that can cause errors on your ADSL Internet connection.
If your ADSL Internet connection works correctly when your telephone equipment is disconnected from your phone line, but stops working when telephone equipment is connected to the line or is in use, then there might be a problem with your ADSL filter installation.
All telephone equipment and other non-ADSL devices that might use telephone lines (like home alarm systems) must be connected to a line that has been filtered at some point. How many filters you need and where they should be installed depends on how your phone wiring is laid out; just make sure that your ADSL modem is not on a filtered line while all other devices that use your telephone line are filtered.
The following diagrams show typical ADSL micro filter installations:
In this example, the primary phone jack uses an integrated ADSL filter with an unfiltered port for the modem and a filtered port for other devices. Only the filter in the primary phone jack is required.
In this example, a single filter is placed between the primary socket and the extensions. The modem is connected to the ADSL socket on the filter while the extensions are connected to the phone socket.
In this example, each phone is filtered separately. Since the ADSL modem is connected to an extension, all the other sockets must have a filter.
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Last Updated:04/18/2022
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Article ID: 22205