| 摘要 |
PURPOSE:To attain calling or interruption connection after the occupied state of an object subscriber is grasped in advance by displaying a busy state on a corresponding display lamp depending on busy data stored in plural busy data flip- flops. CONSTITUTION:Lamps displaying busy state of all subscriber terminal devices called or controlled are arranged on an attendant board DSPBD connected to an exchange switch SW. Further, in calling a required terminal device, a dial signal is transmitted from a trunk OGT by acquiring an outgoing trunk OGT and depressing a call button via the switch SW. The busy information of a subscriber of other station is inputted to a busy information receiver BIFR via a busy information transmission line L, the device BIFR extracts the busy information to the required terminal device from the received busy information and stores the result into the plural incorporated busy data FFs and an output of the FF displays the busy state to a corresponding lamp on the attendant board DSPBD via a position controller (POSC). |
