Chapter 1 Book Notes - 1 CNT 3004- Chapter 1 Notes...

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1 CNT 3004- Chapter 1 Notes Telecommunication – communication at a distance. Includes telephony, telegraphy, and television. Data – refers to information presented in whatever form is agreed upon by the parties creating and using the data. Data communications – the exchange of data between two devices via some form of transmission medium such as a wire cable. For communication to occur, the communicating devices must be part of a communication system made of hardware and software. The effectiveness depends on 4 things: (1) delivery , (2) accuracy , (3) timeliness , and (4) jitter jitter riders to the variation in the packet arrival time. A data communication system has five components: 1. Message – the info (data) to be communicated 2. Sender – device that sends the data message 3. Receiver – the device that receives the message 4. Transmission medium – the physical path by which a message travels from sender to receiver 5. Protocol – a set of rules that govern data communications Information today comes in different forms such as text, numbers, images, audio, and video.’ ASCII – American Standard Code for Information Interchange RGB red , green , and blue . Data Flow – communication between two devices can be simplex, half-duplex, or full-duplex Simplex mode – the communication is unidirectional, as a one-way street. Only one of the two devices on a link can transmit, the other can only receive. EX : keyboard and traditional monitor. Half-duplex – each station can both transmit and receive, but not at the same time. EX : walkie talkies and CB radio. Full-duplex – both stations can transmit and receive simultaneously. EX : telephone network. Network
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This note was uploaded on 10/05/2010 for the course CNT CNT 3004 taught by Professor K during the Spring '10 term at University of Central Florida.

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Chapter 1 Book Notes - 1 CNT 3004- Chapter 1 Notes...

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