ABSENCE TRANSFER INDICATING SYSTEM

摘要

PURPOSE:To facilitate confirming absence transfer register by monitoring the absence transfer register subscriber storage position at every fixed time to send the indication tone. CONSTITUTION:When subscriber SUB-A performs absence transfer register operation, the number of SUB-A and the number of SUB-B of the absence transfer destination are sent to central control unit CC. Unit CC stores these numbers in main memory unit MU and executes the absence transfer register processing. Absence transfer indication control unit CFSC reads out the storage position of the subscriber stored internally successively at a fixed period and sends it to subscriber scanner LSC. When it is recognized by this scanning result that SUB-A is idle, unit CC connects tone transmission trunk RGT to SUB-A to transmit the indication tone for a fixed time.