Data Communication Network
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Data Communication Network
331: STUDY DATA COMMUNICATIONS AND NETWORKS
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331: STUDY DATA COMMUNICATIONS AND NETWORKS
1. Discuss computer networks (5 hrs)
2. Discuss data communications (15 hrs)
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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
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SKILL AREA 331.2.1
Define elements of a Communication
System
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Define elements of a Communication System The following are the basic requirements for
working of a communication system.1. A sender / transmitter (source), which
creates the message to be transmitted.2. A medium that carries the message.3. A receiver (sink), which receives the message.
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Define elements of a Communication System
Basic requirement for working of a communication system
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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.
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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)
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Define elements of a Communication System
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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.
Define elements of a Communication System
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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
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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
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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).
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Discussion Example of data communication: How is the
“Touch n Go” functioning?
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Question?