STATE DISPLAY DEVICE FOR TELEPHONE TERMINAL AND EXISTING TERMINAL ADAPTOR

PURPOSE:To display the state of all telephone terminals in a telephone system independently of kinds of a telephone terminal by collecting state display signals from plural telephone terminals altogether and displaying the state of the telephone terminals based on the collected signals. CONSTITUTION:A group of telephone sets 2 are connected to telephone lines L1-Lk via an existing terminal adaptor 1, telephone lines Lk+1-Ln are accommodated in a master set 3 of the key telephone system and key telephone sets 4 are connected to the master set 3. A state display device 5 collects the state display signals from the telephone sets 2, 4 altogether and displays the state of the telephone sets 2, 4 based on the collected signals.