Connection Terms G = generation 2g - 2nd generation 2G Data Transmission Capacity:[3]*.With GPRS (General Packet Radio Service), you have a theoretical transfer speed of max. 50 kbit/s (40 kbit/s in practice).*.With EDGE (Enhanced Data Rates for GSM Evolution), you have a theoretical transfer speed of max. 250 kbit/s (150 kbit/s in practice).Disadvantages*.In less populous areas, the weaker digital signal transmitted by a cellular phone may not be sufficient to reach a cell tower. This tends to be a particular problem on 2G systems deployed on higher frequencies, but is mostly not a problem on 2G systems deployed on lower frequencies. National regulations differ greatly among countries which dictate where 2G can be deployed.*.Analog has a smooth decay curve, but digital has a jagged steppy one. This can be both an advantage and a disadvantage. Under good conditions, digital will sound better. Under slightly worse conditions, analog will experience static, while digital has occasionaldropouts. As conditions worsen, though, digital will start to completely fail, by dropping calls or being unintelligible, while analog slowly gets worse, generally holding a call longer and allowing at least some of the audio transmitted to be understood. Advantage*. While digital calls tend to be free ofstaticandbackground noise, thelossy compressionthey use reduces their quality,meaning that the range of sound that they convey is reduced. Talking on a digital cell phone, a caller hears less of the tonality of someones voice.[citation needed] Evolution2G networks were built mainly for voice services and slow data transmission (defined inIMT-2000specification documents), but are considered by the general public to be 2.5G or 2.75G services because they are several times slower than present-day 3G service. 2.5G (GPRS)2.5G(second and a half generation) is used to describe 2G-systems that have implemented a packet-switched domain in addition to the circuit-switched domain. It does not necessarily provide faster services because bundling of timeslots is used for circuit-switched data services (HSCSD) as well. The first major step in the evolution of GSM networks to 3G occurred with the introduction of General Packet Radio Service (GPRS). CDMA2000 networks similarly evolved through the introduction of 2.5G2.75G (EDGE)GPRS1 networks evolved toEDGEnetworks with the introduction of 8PSK encoding. Enhanced Data rates for GSM Evolution (EDGE), Enhanced GPRS (EGPRS), or IMT Single Carrier (IMT-SC) is a backward-compatible digital mobile phone technology that allows improved data transmission rates, as an extension on top of standard GSM. EDGE was deployed on GSM networks beginning in 2003—initially by AT&T in the United States.EDGE is standardized by 3GPP as part of the GSM family and it is an upgrade that provides a potential three-fold increase in capacity of GSM/GPRS networks. 2G Shut Down Various carriers such as AT&T have made announcements that 2G GSM technology in the United States is in the process of being shut down so that carriers can reclaim those radio bands and re-purpose them for future technology needs. The shut down will be complete by the end of 2016. All 2G GSM devices will lose service at some point between now and the end of 2016.[4]This shut down is having a notable impact on the electronic security industry where many 2G GSM radios are in use for alarm signal communication to Central Station dispatch centers. 2G GSM radios must be replaced by newer generation radios to avoidservice outages.[5]
Posted on: Wed, 15 Oct 2014 06:07:03 +0000
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