Structure_CDMA - WhatisTeleCommunication? o

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         What is Tele-Communication ? o Tele means DISTANCE and Communication means  INFORMATION  TRANSFER o So transfer of information  between two or more  entities which may be far apart is called as Tele- Communication. Types of Communication tech. o Wireline o Wireless Communication Path 0.         Wireline Physical layout of wires or optical fiber cables between entities . A physical contact is essential between the peer entities for communication 1.           Wireless NO Physical connectivity is required . Communication is done through radio links ( Electro Magnetic Waves ) and repeaters
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( CELL SITES) are placed in between peer entities for efficient communication   What does one expects from Wireless ? 2. Lower cost  3. Roaming 4. Better service and coverage 5. NO dropped calls  6. Enhanced Privacy 7. NO Speech Clipping 8. NO Echo Wireless o It is type of communication technology where   electromagnetic  waves carry the signal (voice and data) on   whole or part of  communication path.  o Wireless telecommunication involves  converting an audio signal into a Frequency (RF) signal  and broadcasting it using radiating devices called  antennas .  
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TATA Teleservices Delhi MSC ARCHITECTURE 1
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COMPONENTS OF WIRELESS o Main Switching Center (MSC) o Cell Site o Cells o Hand set Main Switching Center ( MSC) The center where the wireless switch is situated is called of main  switching center. All the call are first come to msc then they are  then routed to their respective handsets through cell sites  locating the shortest path to the respective handset. CELL SITE A Cell site contains a BTS(Base trans-receiver system which  manages, sends, and receives traffic from the mobiles in its  geographical area to a cellular telephone switch. It also  employs a tower which has antennas, and provides a  microwave link to the distant cellular switch called  MSC and  HandSet
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The Base Station Subsystem controls the radio link with the Mobile  Station.  It is physical system which is installed with cell site. It has Receiver ,  Transmitter and Power back up. It receives signal and add strength to the  signals thus repeating the signal to its original form and transmitting it again  to next entity which may be cell site or hand set.   CELL CELL is the geographical area covered by a cell site . All the  receivers ( handsets) in this particular area respond to this cell  site i.e. they receives and transmits signal to a particular cell  only. Techniques Used in Wireless
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Structure_CDMA - WhatisTeleCommunication? o

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