The D-Link DSL-35MF is a standard UK ADSL microfilter (splitter) designed for use with British telephone sockets.
Function: It plugs directly into a standard BT master socket or extension and splits the single line into two separate outputs:
BT Phone Socket: For analog telephones, fax machines, or Caller ID boxes.
ADSL Socket (RJ-11): For connecting an ADSL broadband modem or router.
Purpose: It filters out high-frequency ADSL data noise from the voice band, preventing static interference on telephone calls and ensuring a stable broadband connection.