2G Cell Phone Systems Three basic second-generation (2G) digital cell phone systems are in wide use today.
{"Image DocumentName": "2G Cell Phone SystemsThree basic second-generation (2G) digital cell phone systems are in wide use today.", "Image ImageDescription": "Two of them use time division multiplexing (TDM), and the third uses spread spectrum (SS). The TDM systems are the Global System for Mobile Communications (GSM) and the IS-136 standard for time division multiple access (TDMA). The SS system is code division multiple access (CDMA).", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}