This is a low cost, very small size ADSL in line microfilter, designed to separate ADSL and POTS telephone service. It consists of 2 pole passive, low pass filter, which eliminates interference between ADSL signals and POTS equipment.
Small size: 50 x 20 x 20 mm, with 10 cm cable, lowest cost, handles loop current up to 100mA and consistance of all passive elements are its benefits.