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6.2 LOW PASS FILTERS FOR ADSL
Most ADSL clients will be required to install a simple device that prevents the ADSL line from interfering with
regular telephone services. These devices are commonly referred to as microfilters or low pass filters. There are two
basic styles of low pass filters commonly used.
6.2.1 IN-LINE FILTER
In line low pass filters are used for each telephone or telephone device (answering machines, Faxes etc.) that
shares the line with the ADSL service. These devices are attached to the telephone cable between the telephone and
wall jack. Filters that install behind the wall plate hidden from view are also available. A typical in-line filter installation is
shown in the diagram below.
In-line low pass filter
Chapter 6 Troubleshooting
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