DATA COMMUNICATION
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Data Communication Fundamentals: Introduction to Transmission Concepts and Signals, Exams of Data Communication Systems and Computer Networks
analog_and_digital_data_transmission.pptx
Typology: Exams
2016/2017
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DATA COMMUNICATION
Data Communication Fundamentals
- (^) Traffic Growth
- (^) Development of new services and
- (^) Advances in technology
Data Communication Model
- (^) Source This device generates the data to be transmitted.
- (^) Transmitter It transforms and encodes the information in such a way as to produce electromagnetic signals that can be transmitted across some sort of transmission system
Communication Tasks
- (^) Transmission system utilization
- (^) Interfacing
- (^) Signal Generation
- (^) Synchronization
- (^) Exchange Management
- (^) Error Detection and Correction
- (^) Flow Control
- (^) Addressing
- (^) Routing
- (^) Recovery
- (^) Message Formatting
- (^) Security
- (^) Network Management
Transmission Terminology
- (^) Guided
- (^) Unguided Guided media
- (^) Point to Point
- (^) Multipoint
Analog & Digital Signals
Periodic
Signals
Varying Sine Waves
s(t) = A sin(2ft +)
Wavelength ()
- (^) is distance occupied by one cycle
- (^) between two points of corresponding phase in two consecutive cycles
- (^) assuming signal velocity v have = vT
- (^) or equivalently f = v (^) especially when v=c (^) c = 3*108 ms-1 (speed of light in free space)
Addition of
Frequency
Components
(T=1/f)
- (^) c is sum of f & 3f
Frequency Domain Representations
- (^) freq domain func of
Fig 3.4c
- (^) freq domain func of
single square pulse
^ < <
Data Rate and Bandwidth
- (^) any transmission system has a limited band of
frequencies
- (^) this limits the data rate that can be carried
- (^) square have infinite components and hence
bandwidth
- (^) but most energy in first few components
- (^) limited bandwidth increases distortion
- (^) have a direct relationship between data rate &