1.intro. data communication
- 1. Chapter 1 By-Uttara tiwari and Sushant sharma
- 2. What is data communication? Not to be confused with telecommunication— Any process that permits the passage from a sender to one or more receivers of information of any nature, delivered in any easy to use form by any electromagnetic system. Data communication- Defined as a subset of telecommunication involving the transmission of data to and from computers and components of computer systems. More specifically data communication is transmitted via mediums such as wires, coaxial cables, fiber optics, or radiated electromagnetic waves such as broadcast radio, infrared light, microwaves, and satellites.
- 3. History of Telecommunications Invention of telegraph Samuel Morse – 1837 Invention of telephone- Alexander Graham Bell – 1876 Development of wireless By ??? – 1896 Concept of universal access and growth of AT&T Divestiture of AT&T—what year??
- 4. 4 Data Communication Hi, how are Hi, how are you? 01010001 Hi, how are Hi, how are you? Computer User you? you? 01010001
- 5. 5 Basic Components Every communication system has 5 basic requirements •Data Source (where the data originates) •Transmitter (device used to transmit data) •Transmission Medium (cables or non cable) •Receiver (device used to receive data) •Destination (where the data will be placed) Graham Betts
- 6. 5 Basic Components Graham Betts
- 7. 7 Data Representation Numbers 8/16/32 bit integers floating point Text ASCII, Unicode Images Bit patterns, Graphics formats JPG/GIF/etc Audio ® Samples of continuous signal Video ® Sequence of bitmap images 150 2 255