Section A: Communication system components:
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:
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, 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:
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; Data
compression: run length encoding, Huffman encoding.