1. Introduction to Communications Technology Mr. Briggs

2. Communication Systems History of Communications: 1450 Johannes Gutenberg builds the movable printing press. 1826 Joseph Niepce of produces the wrold ’ s first permanent photographic image. 1876-Alexander Graham Bell introduced telephone. 1877 Thomas Edison patents the phonograph. 1891 Thomas Edison and William Dickson invent the kinetoscope. 1895 Guglielmo Marconi develops the wireless telegraph 1925 John Logie Baird transmits the first television signal. 1954 The transister radio or tubeless radios become available in the USA 1990 The world wide web is created in Europe. It ’ s chief architect is Tim Berners-Lee.

3. Communication Systems Communication is the ability to send and receive messages. People to people People to machine Machine to people Machine to machine

4. Communication Systems Messages are intended to: – Inform – news papers, TV news casts – Educate – texts, video, DVD ’ s, internet. – Persuade - advertising – Control – machines and tools such as Computer Numeric Control: A type of programmable control system, directed by mathematical data, which uses microcomputers to carry out various machining operations; such as a mill or lathe.

5. Communication Systems All communication systems include a message, a sender, a communication channel, and a receiver. A communication channel is the path over which a message must travel to get from the sender to the receiver.

6. Communication Systems

7. Like all systems, communication systems follow the universal systems model.

8. Communication Systems Inputs: – People – Information – Materials – Tools and machines – Energy – Capital – Time

9. Communication Systems Processes Outputs – Positive Outputs – The desired result of the system. – Negative Outputs – The unwanted results created by the systems. Electromagnetic Radiation Telemarketing Calls Pollution - Old phones, computers, devices, etc. Feedback – Your response to communications

10. Telecommunications Telecommunications means communicating over a long distance.

11. Communication Systems The telegraph by Samuel Morse. Sent electronic signals using wires. Morse devised a language with a series of long and short signals that represented letters and numbers. The telephone by Alexander Graham Bell

12. Communication Systems Video: Digital vs. AnalogDigital vs. Analog

13. Communication Systems Transmission Channels – Copper Wire: Many older phones consist of two thin insulated copper wires twisted around each other. – Coaxial Cable: Carry many more messages all at once than twisted-pair wire. Consists of an outer tube made of a material that conducts electricity (usually copper). Inside the tube is an insulated central conductor (also copper). Several of these cables are combined into one bundle.