The Microfilter is a low-pass filter (300 to 3.400 Hz) that should be installed between each telephone and the telephone socket. Its application on xDSL and RF systems avoids the hearing of interferences generated by the modulation of these systems. Specifically for the ADSL technology (Asymmetric Digital Subscriber Line), it provider an attenuation higher than 40 dB in the range of 30Khz to 2.2 Mhz.

Microfilter Telebrás Standard (ADSL)

The Telebrás Microfilter has an entry for telephone sockets Telebrás Standard and an exit Telebrás Standard through the low-pass filter for the telephone. Resides, it incorporates two more connectors (RJ11 female), one identified with the symbol “Tel” for the telephone, and the other with the symbol “Modem PC” for the connection of the ADSL modem.

Simple Microfilter (ADSL)

The Simple Microfilter has an entry for the telephone socket and an exit (RJ11 female) for the telephone or for the user’s Terminal device, through the low-pass.

Combined Microfilter (ADSL)

The Combined Microfilter has an entry (RJ11 male) for the telephone socket and two exits (RJ11 female) for the telephone or for the user’s Terminal device, through the low-pass filter, and another for the ADSL modem.