Session 4

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Session 4

  1. 1. Introduction to IT<br />Session-4<br />
  2. 2. Operating System<br />Collection of system programs that together controls the operation of computer system<br />Two objectives:<br />Managing hardware<br />Provides an interactive interface and interprets commands<br />
  3. 3.
  4. 4.
  5. 5. Types of OS<br />Batch processing OS<br />Multi-user or time-sharing<br />Multi-tasking<br />Multi-processor<br />Real-time<br />Industrial Control , telephone switching equipment , flight control , military applications, railway reservation <br />Embedded<br />Household appliances, traffic control systems<br />
  6. 6. Functions of OS<br />Process management<br />Memory management<br />File management<br />Device management<br />Security management<br />User interface – CLI & GUI<br />
  7. 7. Data Communication<br />Exchange of data between two devices using wired or wireless medium<br />Communication system- collection of hardware and software that facilitate DC<br />Local or remote<br />Components of DC<br />Message<br />Receiver<br />Sender<br />Medium<br />Protocol – set of rules that coordinates the exchange of information<br />
  8. 8. Data transmission mode<br />Simplex<br />Half-duplex<br />Walkie-talkie<br />Full-duplex<br />
  9. 9. Data transmission<br />Analog<br />Continuous signals<br />Digital<br />Data stored in the form of 0 and 1<br />Modem<br />Converts digital to analog and vice versa<br />

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