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About 2G System

 

2G: 2G (or 2G) is short for second generation wireless telephone technology. Second generation 2G cellular telecom networks were commercially launched on the GSM standard in Finland by Radiolinja in 1991. Three primary benefits of 2G networks over their predecessors were that phone conversations were digitally encrypted; 2G systems were significantly more efficient on the spectrum allowing for far greater mobile phone penetration levels; and 2G introduced data services for mobile, starting with text messages. After 2G was launched, the previous mobile telephone systems were retrospectively dubbed 1G. While radio signals on 1G networks are analog, radio signals on 2G networks are digital. Both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system. 2G has been superseded by newer technologies such as 2.5G, 4G; however, 2G networks are still used in many parts of the world. GSM (TDMA-based), originally from Europe but used in almost all countries on all six inhabited continents. Today accounts for over 80% of all subscribers around the world. Over 60 GSM operators are also using CDMA2000 in the 450 MHz frequency band (CDMA450). PDC (TDMA-based), used exclusively in Japan iDEN (TDMA-based), proprietary network used by Nextel in the United and Telus Mobility in Canada IS-136 a.k.a. "D-AMPS">D-AMPS (TDMA-based, commonly referred as simply 'TDMA' in the US), was once prevalent in the Americas but most have migrated to GSM.

2G services are frequently referred as Personal Communications Service, or PCS, in the United States.
Capacities, advantages, and disadvantages
Capacity
Using digital signals between the handsets and the towers increases system capacity in two key ways:

Disadvantages

Advantage

Reference:

Wireless communication
By
Andrea Goldsmith
Stanford University

MCSE TRAINING GUIDE
TCP/IP
By
Emmett Dulaney
john white
Sherwood Lawrence
raymond williams
Robert Scrimger
kevin wolford
Anthony tilke
http://en.wikipedia.org/wiki/2G

 

Images:

Google Images

 

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