3.3.3

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  • 3.3.3
    • Mobile phone networks
      • Cellular
        • A base station links the mobile phone to the rest of the mobile and fixed phone network
          • Telephone cables
            • Cellular
              • A base station links the mobile phone to the rest of the mobile and fixed phone network
                • Telephone cables
                  • Radio links between antenna at base station and another at main telephone network
                    • 3 factors: Local terrain, Frequency band, capacity needed for given area
              • Radio links between antenna at base station and another at main telephone network
                • 3 factors: Local terrain, Frequency band, capacity needed for given area
            • Satellite
              • A mobile that connects to satellite - calls, texts, internet (slow) and video confrencing
                • Geosynchronous
                  • Satellite
                    • A mobile that connects to satellite - calls, texts, internet (slow) and video confrencing
                      • Geosynchronous
                        • Fixed over the same point of earth, line of sight is needed between the phone and the satellite
                      • Low earth orbit
                        • Not fixed, circles the earth. signal is better as it reaches more areas due to movement
                  • Fixed over the same point of earth, line of sight is needed between the phone and the satellite
                • Low earth orbit
                  • Not fixed, circles the earth. signal is better as it reaches more areas due to movement
            • Phone use can be seen as antisocail as it discourages face to face communication
              • Credit is needed which can seem expensive, battery life, and signal is needed
            • It provides security as there is help just a call away
          • Broadband connections
            • Asymmetric digital subscriber line
              • Uses copper cable, can be used for data and voice at the same time. Uses existing phone network so minimal disruption.
                • Upstream - Uploading Downstream - Downloading
                  • Full duplex - messages can be sent and received at same time. Half duplex - sent or received
            • Cable

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