ELECTRONIC IDF SYSTEM

PURPOSE:To set optionally a desired connection state based on external information input in a terminal board used to connect a host line of a telephone exchange and a terminal equipment such as a telephone set in an optional relation. CONSTITUTION:A terminal board used to connect optionally plural host lines of a telephone exchange 4 and plural terminals of telephone sets 51-5n is provided with a matrix switch section 2 to connect each host line to each terminal of a terminal array in one axial direction respectively and to connect each terminal equipment to each terminal of a terminal array in other axial direction respectively, to connect a switch a cross point between a connection line from each terminal of one axial direction and a connection line from each terminal of other axial direction, and the system is provided with a controller section 3 to control the drive of each switch in the matrix switch section 2 and the connection between an optional host line and an optional terminal equipment is selectively realized by the setting of connection control information of each switch of the matrix switch section 2 with respect to the controller section 3.