CS333-ch1[1] MIS - Overview 1.1 Data Communication...

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Overview
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1.1 Data Communication Components Data Representation Direction of Data Flow
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Data communications : the exchange of data between two devices via a transmission medium ( e.g. a wire cable) The effectiveness of data communication system depends on: 1. Delivery. Must deliver data to the correct destination. 2. Accuracy. Must deliver unaltered data. 3. Timeliness. Deliver data in timely manner. Data delivered late are useless. Real time transmission (in video audio case): deliver the data as they are produced, in the same order as they are produced. 4. Jitter ( the variation of packet arrival time): the uneven delay in video\audio packets results in an uneven quality in the video.
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Figure 1.1 Five components of data communication Components 1. 2. Sender: device that sends the data – computer, telephone, camera 3. Receiver: device that receives the data – computer, telephone, camera 4. Transmission medium: physical path by which MSG. travels. 5. Protocols: Set of rules that govern data communications/ an agreement between the communicating devices
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Data representation : form of information. Text : represented as a bit pattern. ASCII code. Numbers: bit pattern, not ASCII, numbers converted to binary numbers. Images: bit pattern, image is composed of matrix of pixels (picture element). Where each pixel is a small dot, each pixel is assigned a bit pattern. Audio: broadcasting of sound, audio is contineous not discrete. In ch 4,5 we learn how to change sound to digital or analog signal. Video: broadcasting of movie,
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Data Flow : Simplex Communication is unidirectional. One way street, one device transmit and the other receive, e.g. keyboard - monitor
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Data Flow : half duplex Each station can both transmit and receive but not at the same time, one lane road, e.g. Walkie-Talkies .
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Data Flow : full duplex Both station can transmit and receive simultaneously, two way street, e.g telephone network. Sharing can occur in two ways:
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CS333-ch1[1] MIS - Overview 1.1 Data Communication...

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