PUSHBUTTON TELEPHONE SET

PURPOSE:To relax a limit of number of special terminal equipments to be connected by connecting plural special terminal equipments to the telephone set, allowing data transmission by polling, adding an address to the data and sending a simultaneous data to the special terminal equipments. CONSTITUTION:Plural special terminal equipments 103-n03 are branched to one of communication lines 4-1-4-n leading to each of pushbutton telephone sets 2-1-2-m and data is transferred simultaneously to all special terminal equipments by using an address preset by a pushbutton telephone set. Then data transmission enable is implemented by polling and a data from each special terminal equipment is stored to a data storage means 22 built in the pushbutton telephone set. Thus, plural special terminal equipments are connected more to the pushbutton telephone set and the communication of data between a master set and the special terminal equipment is implemented more smoothly without giving effect onto the communication of the pushbutton telephone set.