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Telecommunications

Telecommunications. Overview of Technology. Timeline of Telecom. 1876 : Bell patents the telephone 1920 : KDKA in Pittsburgh provides regular commercial radio broadcasts 1927 : Philo Farnsworth demonstrates his invention, the television

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Telecommunications

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  1. Telecommunications Overview of Technology

  2. Timeline of Telecom 1876: Bell patents the telephone 1920: KDKA in Pittsburgh provides regular commercial radio broadcasts 1927: Philo Farnsworth demonstrates his invention, the television 1963: Syncom II becomes the first communication satellite to geosynchronously orbit the Earth 1973: ARPANET uses e-mail 1978: GPS begins operating

  3. Telecommunications Communication over long distances • Popular telecom devices today • Telephone • Television • Radio • Satellite • Other telecom devices in history • Smoke signals • Pony Express • Lighting signal fires on top of hills

  4. Telegraph • Sends electronic impulses over wire • Made up of • Battery • Sending device (key) • Wire • Receiver (sounder) • Morse Code

  5. Telegraph cont’d • Significant step in communicating over long distance • Led to the development of the telephone

  6. Telephone • Alexander Graham Bell is credited with the invention of the telephone, but his patent was only two hours ahead of Elisha Gray who also had developed a telephone.

  7. How does the telephone work? • Research what materials Bell used in creating his telephone. • How did he use the materials to carry sounds over long distances. • Find a picture of what his phone looked like.

  8. Cellular Technology • Use radio waves to transmit conversations • Call is transferred from one operating area to another to maintain a good signal • Operating area is called a cell ( hence “cellular”) • Your conversation is bounced around from one cell to another.

  9. Transmission Channels • Wires, cable, optical fibers, microwaves, radio waves. • Look on the Internet and find the uses in transmission for : • Copper wire • Coaxial cable • Optical fibers • Microwaves • Radio waves

  10. Cellular area

  11. Television • Electronic system of transmitting pictures and sounds over a wire or through the air.

  12. How television developed • In the 1920’s sending visual images over distances became the ambition of many inventors • Early TVs had poor picture quality • Small screen • Had to sit directly of front of set

  13. Uses of Television • Thought of only as a entertainment early • Later it became obvious that it could be used for • Education • Information distribution • In 1939, only 1 or 2 programs were aired daily • By 1946, the number of programs was growing rapidly • Now we have hundreds of options

  14. How the TV works • Camera • Transmission • Receiver

  15. The Television Camera • Camera converts images and light (video) and sounds (audio) into electrical signals that can be recorded. • The recorder puts this information onto magnetic tape, discs, or memory cards. How TV works

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