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Data Communication Network

Data Communication Network. 331: STUDY DATA COMMUNICATIONS AND NETWORKS. 331: STUDY DATA COMMUNICATIONS AND NETWORKS. 1. Discuss computer networks (5 hrs) 2. Discuss data communications (15 hrs). 331.2: Discuss Data Communications. PERFORMANCE STANDARD

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Data Communication Network

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  1. Data Communication Network 331: STUDY DATA COMMUNICATIONS AND NETWORKS

  2. 331: STUDY DATA COMMUNICATIONS AND NETWORKS • 1. Discuss computer networks (5 hrs) • 2. Discuss data communications (15 hrs)

  3. 331.2: Discuss Data Communications • PERFORMANCE STANDARD • Given a network system, identify and illustrate the different data communications components clearly • Objectives: • Define elements of a communication system • Define data communications • Discuss various types of transmission media and their characteristics • Discuss encoding of information tor transmission • Discuss types of signal & their characteristics • Relate data capacity of a channel and bandwidth • Classify media based on bandwidth • Discuss channel organization

  4. SKILL AREA 331.2.1 Define elements of a Communication System

  5. Define elements of a Communication System • The following are the basic requirements for working of a communication system. • A sender/transmitter (source), which creates the message to be transmitted. • A medium that carries the message. • A receiver (sink), which receives the message.

  6. Define elements of a Communication System Basic requirement for working of a communication system

  7. Define elements of a Communication System • In data communication four basic terms are frequently used. They are: • Data: A collection of facts in raw form that become information after processing. • Signals: Electric or electromagnetic encoding of data. • Signaling: Propagation of signals across a communication medium. • Transmission: Communication of data achieved by the processing of signals.

  8. Define elements of a Communication System • The basic components of communication system are: • Input / Data Source (where the data originates) • Transmitter (device used to transmit data) • Transmission Medium (cables or non cable) • Receiver (device used to receive data) • Output / Destination (where the data will be placed)

  9. Define elements of a Communication System

  10. Define elements of a Communication System • The input produced by a source must be converted to a form suitable for the particular type of communication system. • Example: In electrical communications, speech waves are converted by a microphone to voltage variation.

  11. Define elements of a Communication System • The transmitter processes the input signal to produce a suitable transmitted signal suited to the characteristics of the transmission channel. • The Medium can have different forms: The atmosphere (or free space), coaxial cable, fiber optic, waveguide, etc. • The signal undergoes some amount of degradation from noise, interference and distortion

  12. Define elements of a Communication System • The receiver’s function is to extract the desired signal from the received signal at the channel output and to convert it to a form suitable for the output. • Other functions performed by the receiver: amplification (the received signal may be extremely weak), demodulation and filtering

  13. Define elements of a Communication System • Example: Khaliq uses microphone to sing a song. • Input / data source: voice • The input (in analogue) will be converted to a digital form. • The transmitter will send the digital signal to the receiver (speaker) via a medium/channel (wire).

  14. Discussion • Example of data communication: How is the “Touch n Go” functioning?

  15. Question?

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