Local concentration of accessing loads on a data buffer during data cell reading is reduced. Also, by providing sufficient time for a data cell reading operation with respect to data cell transmission timing, transmission rate fluctuation of CBR data cells in a transmitting side is reduced. When transmission...http://www.google.com/patents/US6940812?utm_source=gb-gplus-sharePatent US6940812 - APPARATUS AND METHOD FOR TRANSMITTING CONSTANT BIT RATE DATA CELLS, CONTROLLING TRANSMISSION OF DATA CELLS TO PREVENT HEAD DATA CELLS FROM BEING SENT OUT THROUGH THE CONTINUOUS SLOTS OF THE TRANSMISSION CYCLE