TK interface for the audio connection of a Sfera analog audio or video door intercom system to a telephone system with TFE interface in accordance with FTZ 123D12. Features: - Door call on the TK system (potential-free or active signal input on the TK system, not via SK100) - Floor call on additional loudspeaker possible - Speaking with a door station - Door opening via the TK system - Loudspeaker and microphone power can be set separately - The interface is powered via the door intercom system Dimensions: 69 x 57 x 24 mm
