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DCN_rpj2 - NT503 Data Communication Networking...

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1 NT503: Data Communication & Networking Communication Networks
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2 Hardware of a communication system Source - ¾ generates data to be transmitted ¾ e.g. PC, workstation Transmitter - ¾ converts digital data into signal (or transmittable form) ¾ e.g. modem (modulation) Transmission media - ¾ carries signal ¾ e.g. public telephone network Receiver - ¾ converts received signal into digital data ¾ e.g. modem (demodulation) Destination - ¾ receives digital data ¾ e.g. PC, workstation
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3 Communications Model
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4 Signal representation
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5 Important tasks of a communication system Signal generation ¾ digital data converted into analogue form for transmission by process called modulation ¾ amplitude, phase and frequency modulation Message Formatting ¾ Compression and decompression of data Synchronization ¾ synchronization between sender and receiver Interfacing ¾ conversion between various interfacing standards Exchange Management ¾ opening a session, delivering to the right process Error Detection and Correction ¾ e.g. parity checking, checksum, CRC
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6 Important tasks of a communication system Recovery ¾ in case of missing data, system crash Addressing, Routing, Switching ¾ switching between various networks and networking devices Transmission System Utilization ¾ utilization of allotted bandwidth ¾ effective channel utilization, multiplexing etc.
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