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ALSO CALLED: Time Division Multiplexing, Time Division Multiple Access, TDM
DEFINITION: D-AMPS is now called Time Division Multiple Access/IS-136. D-AMPS (Digital-Advanced Mobile Phone Service), sometimes spelled DAMPS, is adigital version of AMPS (Advanced Mobile Phone Service), the original analog standard for cellular telephone phone service in the United States. Both D-AMPS and AMPS are now used in many countries. D-AMPS adds time division multiple access (TDMA) to AMPS to get  … 
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TDMA DEFINITION (continued): …  three channels for each AMPS channel, tripling the number of calls that can be handled on a channel. D-AMPS is Interim Standard-136 from the Electronics Industries Assocation/Telecommunication Industries Assocation (EIA/TIA).Like AMPS, D-AMPS uses frequency ranges within the 800 and 900 Megahertz (MHz) electromagnetic radiation spectrum. Each service provider can use half of the 824-849 MHz range for receiving signals from cellular phones and half the 869-894 MHz range for transmitting to cellular phones. The bands are divided into 30 kHz sub-bands, called channels. The receiving channels … 
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