GSM ( Global System for Mobile Communication )

        

   FEATURES

• High quality audio and link integrity
• High spectral efficiency
• Identical system in all countries
• Inter-system roaming
• High degree of flexibility
• Compatibility with other systems like ISDN
• High security features
• Additional features such ass SMS facsmile
• Low cost infrastucture  

     GSM network area

• GSM service area 
• PLMN area 
• MSC service area
• Location area
• Cells