39 hours, optionally

Information theory. Information source: Amount of information, entropy, redundance. Discrete communication system: Static and dynamic characteristics of the source, transmission channel, receiver. Coding: Realization principles, signification for transmission, examples of application.
Data transmission. Fundamental conception and terminology: Frequency, spectrum, bandwidth,bit rate, data transfer rate. Data and signals, sorts of transmission and their examples. Data corruption during transmission: Outer influence, inner influence. Transmission reliability. Transmission media.
Coding of analog and discrete signals. Explanantion of the concepts "analog data" and "digital data". Four possible systems for data transmission: Systems "digital data and digital signal", "digital data and analog signals","analog data and digital signals"and "analog data and analog signals". Application and realization regions of these systems.
Coding for redundance reduction. Fundamental methods: Prefix codes, Huffman code. More complex methods: Compression of bit sequences, one- and double-line encoding in the fax system.
Anti-error coding. Method for the simulation of interfering effects. Detection and correction of errors. Example of a decoding Table. Principles of anti-error coding. Protection capability of codes. Classification of anti-error codes.
Block codes. Methods of setting block codes: Generation and control matrix, generation polynomials. Data protection by cyclic codes: Model of the protection process, possibilities of encoder and decoder realization. Examples of block codes.
Tree codes. Classification of tree codes: Fundamental trees codes, trellis codes, convolution codes. Methods of setting convolution codes: Generation polynomials, generation matrix. Protection capability of tree codes. Encoding and decoding process realization.
Anti-error code protection systems (ACPS). Example of the formation of ACPS. Position of ACPS in a superior transmission system. Requirements made on ACPS and their solution possibilities. Examples of ACPS.
Special modulations which make use of the anti-error protection principles. Systems with multilevel phase keying. Artificial increase in modulation system redundancy. Anti error coding in a phase keying system.
Scrambling technology. Necessity of uniform distribution of signal energy. Fundamental scrambler. Scramblers with N counters for N periods. Spectral characteristics of output signal. Scramblers and phasing. Transmission security during scrambling.
Encryption basics. Principles of data security: Cryptography and cryptoanalysis, cryptographic system, cryptographic key, rules of cryptology. Methods of classical cryptology. Public key encryption..
Security assurance in networks. Security problems in computers networks. Encryption in networks. Verification of access. Authentication of users. Endangerment by active nodes. Monitoring of traffic. Data integrity.
Queuing theory. Description of queuing system (QS): Properties, structure, significance of individual parts. Queuing theory characteristics: Kendall classification of QS, other parameters of QT. Examples of application QS in technical practice: Node throughput of communication networks, designing a system of maintenance.

13 hours, compulsory

Data signal compression in data communication systems.
Scrambling in data communication systems.
Fundamentals of encryption technology in data communication systems.
Anti-error protection code systems in data communication systems.
Simulation of the influence of transmission parameters on data signal.