At the completion of the GSM Full Rate exercise, the Half Rate (HR) speech coding exercise was started, with the objective of meeting the same basic quality of the GSM full rate by using half the bit rate (the GSM full rate speech codec requires 13 kbit/s, added to 9.8 kbit/s to the channel coder, making a total rate for the GSM speech channel The GSM is compatible with ISDN (Integrated Services Digital Network) What is CDMA? CDMA is an acronym for Code Division Multiple Access, which is also a radio telecommunication standard similar to GSM. The CDMA came into existence in 2G and 3G generation as the protocol of wireless communication.
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2G refers to the second generation of mobile networks based on GSM. The radio signals used by the 1G network were analog, while 2G networks were digital. 2G capabilities were achieved by allowing multiple users on a single channel via multiplexing. During 2G, cellular phones were used for data along with voice. Some of the key features of 2G were:

2G and 3G networks. Study objectives This report aims at identifying the most suitable market, regulatory and commercial conditions for switching off 2G and 3G networks in APAC markets. In particular, it examines: • Likely drivers for legacy 2G and 3G network shutdown; • The necessary steps to initiate a network switch-off; GPRS and EDGE are both 2G technology, but EDGE is significantly faster with a download speed of up to 384Kbps. EDGE is most-a-times called a 2.5G network as it also has some characteristics of a 3G network, but it doesn’t satisfy the specification. 3G. Introduction of the 3G network made video calling and seamless streaming of video possible. . 380 12 199 129 264 220 208 126

is gsm 2g or 3g