A fluctuating annuity payment is determined and generated, and that annuity payment is subsequently fixable. this invention is composed of a cell segmentation and reassembler portion and a frame handling portion, wherein SAR portion receives a stream of ATM cells from lines VC1 to VCn, separates ATM cells depending on whether they come from VP or VC connections, and assembles them into AAL5 frames. The information is cleared from the display following receipt of an indication from the second device that the information has been successfully inputted at the second device.