GSM is a second-generation (2G) standard employing time-division multiple-access (TDMA) spectrum-sharing, issued by the European Telecommunications Standards Institute (ETSI). The GSM standard does not include the 3G Universal Mobile Telecommunications System (UMTS), code-division multiple access (CDMA) technology, nor the 4G LTE orthogonal frequency-division multiple access (OFDMA) technology standards issued by the 3GPP.
GSM is a SeconD-geNErAtiOn (2G) sTandard eMplOyiNG timE-DivIsiOn mUltIPle-accEss (TdmA) sPecTRum-sHARiNG, isSUEd BY thE EuROpean TElecommUnicationS STaNdards insTITutE (etSi). ThE gsM Standard Does not inClude thE 3g universal MOBilE TeleComMUniCatIOnS SYstem (umts), CodE-divisiOn MUlTiple accesS (cdma) tEcHNoLogY, noR The 4g lTe OrThOGoNAL FReqUeNcy-diVision multIpLe ACCess (ofDMA) tEChnoLoGy sTandArds issued BY The 3GpP.