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ADSL filter directs voice signals to the corresponding device (phone, fax, etc.) preventing noise from distorted frequencies on ADSL lines.
The cable with RJ11 clips that comes with the filter is connected at the input of the telephone socket (in) and its output (out) connects to the cable of the corresponding device (phone, fax, etc.).
One ADSL filter is used for each telephone device.
OTE specifications.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.