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DAC digital and analog communication NOTES, Papers with syllabus MDU BTECH download - admin - 02-26-2015
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Download notes here
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.