All power requirements are provided from the AC mains. Visual indication of call arrival and status is given by LEDs (Light Emitting Diodes), at each telephone instrument. Interconnection between the main unit and the extension telephone is by way of an external distribution frame (MDF), via the terminal block using 2 pair cable
A power-fail enables one or more standard telephones to be connected to the Panasonic KXT 308 telephone system. In the event of a mains power -failure the system automatically switches to basic facilities enabling users to make and receive PSTN calls only.
The apparatus must be connected to the PSTN by the connection of the incoming PTO cables to the Test Jack Frame (TJF) which is separately mounted from the main unit.