GSM PARAMETERS

1. 200 KHZ TRAFFIC CHANNELS.
   
2. 992 FULL DUPLEX CHANNEL.
   
3. FDMA/TDMA ACCESS.
   
4. 890MHZ to 915 MHZ mobile transmit band (reverse channel).
   
5. 935MHZ to 960 MHZ base station transmit band (forward channel)
   
6. GSM uses two 25 MHZ frequency for system use in all member companies.

The main features of GSM are:

• Unauthorized access in GSM is very rare and is near impossible as encryption keys are used to authenticate a user. There fore it is a very secure technology.
  
• Very clear high quality sound comparable to landline phone is available at the output of the receiver set as digital technology is used. The noise level is reduced to minimal level and dropout level is also very low.
  
• You can change your handset as SIM card, which is the identification of user for the network, can be placed in other GSM handsets also.
  
• You can use your mobile phone anywhere in your country where GSM network is available and even in other countries that operate GSM network. As most of the European countries use GSM network, a mobile user can literally roam anywhere in Europe without any problem.
  
• GSM provides maximum flexibility to other services like ISDN, gives improved spectrum efficiency, better quality transmission.
  
• Cheap services as compared to other technologies as handsets used are developed through semiconductor electronic chips, which are produced by VLSI techniques (very large scale integration), and are interchangeable.
  
• The frequency band (890-915MHz and 935-960MHz) and the signaling system are used according to international standards.
  

See Some Reference Sites:

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