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Communication Systems

Communication Systems

Process describing transfer of information, data, instructions between one or more systems through some media

nExamples

npeople, computers, cell phones, etc.

nComputer communication systems

nSignals passing through the communication channel can be Digital, or analog

nAnalog signals: continuous electrical waves

nDigital signals: individual electrical pulses (bits)

nReceivers and transmitters: desktop computers, mainframe computers, etc.

A Communications Model

How Computers Work

How Computers Work

The parts of a computer

• The Central Processing Unit:
  
  • (CPU),
  • Buses,
  • Ports and controllers,
  • ROM;
• Main Memory (RAM);
• Input Devices;
• Output Devices;
• Secondary Storage;
  • floppy disks,
  • hard disk,
  • CD-ROM

The History Information Technology

The History Information Technology