| 摘要 |
PURPOSE:To omit setting of the generating timing of a pulse signal, by dividing plural circuits stored in a key telephone device into several groups and selecting properly these groups by operating a semifixed switch. CONSTITUTION:The 12 semifixed switches are turned on with every group when installing a key telephone set. For instance, the contact of each of semifixed switches 85SX, 85RY, 85ER, 85FR, 85GR, 85HR, 85VX, 85UY, 85MU, 85NU, 85OU and 85PU is closed when a key telephone set of the 1st group is installed. Accordingly the key telephone set of the 1st group selects the 1st-16th trunk lines among the 1st-20th trunk lines and 4 extension circuits. The 8 trunk lines of the 1st-4th and the 9th-12th ones are allotted in common to all groups. At the same time the 4 extension circuits are allotted in common to all key telephone sets. |
