D-AMPS

D-AMPS stands for Digital Advanced Mobile Phone Service (AMPS). D-AMPS uses Time Division Multiple Access (TDMA) to divide every channel into three channels. D-AMPS digitally compresses voice data. D-AMPS uses frequencies between 800 to 900 Megahertz (MHz) where each channel is devides into 30Khz channels or sub-bands.