DAC digital and analog communication NOTES, Papers with syllabus MDU BTECH download

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Section A: Communication system components: DOWNLOAD NOTES HERE

• Introduction to Communication: Definition & means of communications;
  
• Digital and analog signals: sign waves, square waves; Properties of signals: amplitude, frequency, phase;
  
• Theoretical basis for data communication:
  
• Fourier analysis: Fourier series and Fourier Transform (property, ESD, PSD and Raleigh) effect of limited bandwidth on digital signal.
  
  

Section B: Data Transmission System: DOWNLOAD NOTES HERE

• Physical connections: modulation, amplitude-, frequency-, phase- modulation;
  
• Data encoding: binary encoding (NRZ), Manchester encoding, differential Manchester encoding.
  
• Transmission Media: Twisted pair-, co-axial-, fiber optic-cables, and wireless media
  
• Transmission impairments: attenuation, limited bandwidth of the channels, delay distortion, noise, data rate of the channels (Nyquist theorem, Shannon limit).
  
• Physical layer interfaces: RS 232, X.21
  
  

Section C: Standards in data communications:

• Communication modes: simplex, half duplex, full duplex;
  
• Transmission modes: serial parallel-transmission;
  
• Synchronizations: Asynchronous-, synchronous-transmission;
  
• Type of services: connection oriented-, connectionless-services;
  
• Flow control: unrestricted simplex protocol, simplex stop- and -wait protocol, sliding window protocol;
  
• Switching systems: circuit switching; picketing switching: data gram, virtual circuits, permanent virtual circuits.
  
• Telephone Systems: PSTN, ISDN, asynchronous digital subscriber line.
  
• Multiplexing: frequency division-, time-, wave- division multiplexing.
  
  

Section D: Security in data communications:  DOWNLOAD NOTES HERE

• Transmission errors: feedback-, forward-error control approaches;
  
• Error detection; Parity check, block sum check, frame check sequences;
  
• Error correction: hamming codes, cyclic redundancy check;
  
• Data encryption: secret key cryptography, public key cryptograph;
  
• Datacompression: run length encoding, Huffman encoding.
  
  

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