| 摘要 |
PURPOSE:To prevent mis-operation by coloring and displaying the connection state of a line onto a display window in at least intermediate color of two lighting colors of each lighting color of plural light sources so as to easily identify the connecting state of a trunk line. CONSTITUTION:Two light emitting diodes 21, 22, e.g., green and red light emit ting diodes are built in one display window, the idle state of a trunk line is displayed by turning off the light emitting diodes 21, 22 on the display window, the one telephone set acquisition state is displayed by the illumination of the lighting color of the light emitting diode 21 the holding state thereof is displayed by the blink of the lighting color of the light emitting diode 21, the other tele phone set acquisition state is displayed by the illumination of the lighting color of the light emitting diode 22, the holding state thereof is displayed by the blink of the lighting color of the light emitting diode 22 and the incoming state is displayed by the blink of the intermediate color between the lighting color of the light emitting diodes 21, 22 respectively. Thus, since the display color on the display window is increased without increasing the number of the light emitting diodes 21, 22, the connecting state of the trunk line is identified easily.
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