2G (GSM)


2G (or 2-G) is short for second-generation cellular phone technology. Cellular technology comes to replace the first cellular technology, which uses 1G analog systems such as AMPS (Advanced Mobile Phone System). 2G is a mobile telecommunications network which was launched commercially in the standard GSM network in Finland by Radiolinja (now part of Elisa) in 1991. In contrast to 1G, 2G systems use digital. In addition to voice communication services, 2G can also serve the communication of text, namely SMS.

2G technology

Time Division Multiple Access (TDMA)

The way this technology works is by dividing a radio frequency allocation based on time unit. TDMA technology could serve the three sessions as well as phones by doing repetitions in units of time slices in a single radio channel. Thus, a frequency channel can serve three-session interval as phones at different times, but still patterned and continuous. With the weave all the time, it will form a communication session.

Personal Digital Cellular (PDC)
PDC has the same relative way of working with TDMA. The difference is the area of implementation. TDMA is more widely used in the United States, while many are implemented in the Japanese PDC

iDEN
iDEN is a technology used only in devices with a particular brand (proprietary FBR technology). This technology is a communications technology company owned the largest in America, Motorola, who later popularized by Nextel. iDEN TDMA-based technology with GSM architecture that works at a frequency of 800 MHz. Typically used for applications Private Mobile Radio (PMR) and “Push-to-Talk”.

Digital European Cordless Telephone (DECT)
DECT TDMA-based technology is focused on enterprise-scale business purposes, instead of scaling the service providers that serve users in a very large quantity. Examples of applications of this technology is a wireless PBX, and wireless intercom antartelepon. The size of radio cells that are not too big cause of this technology used only in a limited range. Nevertheless, the DECT technology to allocate a wide frequency bandwidth, which is about 32 Kbps per channel. Wide frequency bandwidth allocation is to produce quality sound or better data in standard formats ISDN.

Personal Mobile Service (PHPS)
PHS is a technology developed and implemented in Japan. This technology does not differ greatly from the DECT which also allocates 32 Kbps channel to maintain its quality. This technology is focused on the interests of the population within the coverage area high that FBR is not too large. Usually the PHS technology to place base stations at locations around the area of the crowd, like malls, and office buildings.

IS-95 CDMA (CDMAone)
CDMAone different from other 2G technology because this technology-based Code Division Multiple Access (CDMA). These technologies increase the capacity of the session as phones by using an encoding method that is unique for each frequency channel it uses. Given this coding system, then the traffic and time allocation of each session can be arranged. Frequencies used in this technology is 800 MHz. However, there are other variants in the 1900 MHz frequency.

Global System for Mobile (GSM)
GSM uses TDMA system with an allocation of approximately eight users within a frequency channel of 200 KHz per unit time. Initially, the frequency used is 900 MHz. In its development the frequencies used are 1800 MHz and 1900 MHz. The advantage of GSM is the interface that is more for the providers and users. In addition, the ability of providers antarsesama roaming allows users to freely communicate.

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