PURPOSE: To enable diverse segmentation and to make unnecessary the work design and wiring work accompanied with the terminal change, by performing the tenant designation with the control of terminal corresponding bits from the central processing unit, in PBX.
CONSTITUTION: The attendant boards ATTO to N belonging to the tenants A and B are allocated at the subscriber terminals of the exchanger network NW and the main line trunk COT assigned to the tenants A and B is allocated to the trunk terminals. Further, the incoming of main line is detected with the central processing unit CC via the trunk scanning unit TSCN, and the display for incoming is made to the attendant boards ATTO to N by setting "1" to the corresponding bit of the attendant board control unit POS via the signal distributer SD. The reference table of the attendant board corresponding to each tenant is memorized in the memory M, and the display relay of POS desired is operated by referencing the reference table by program with CC.
ISHII TADAO
ISHIWATARI MASAO
INOMOTO NORIHIKO
