PURPOSE: To prevent the shift with time between subscribers to be connected and disconnected by writing a data to a buffer in order starting from the youngest in time slot.
CONSTITUTION: A buffer BUFF is provided between a central controller CC and a control memory CM and the timing writing connecting information from the central controller CC to the buffer BUFF is made asynchronous with a frame clock. The information is written in order starting rom the youngest in time slot and when the write of one set of all connecting information is finished, a write end flag is set and the connecting information stored in the buffer BUFF is transferred to a control memory CM sequentially from the head of a frame started just after the write end flag is set.
KAMIO YOSHIHARU
SUMIDA TETSUAKI
