Telecommunication Network Reliability

Course Description

Within the scope of this subject students gain knowledge on system and telecommunication network reliability, availability and security as well as on system fault, error and outcome. Main topics are: Definitions of system reliability, availability and security. System failure, fault, error and outcome. Redundancy structures and calculation of complex system reliability: analytical methods, Monte Carlo simulation. Modelling of dependant failures. Telecommunication network reliability. Topological parameters of network reliability. Failure diagnosis in digital systems. Self-diagnosis systems. Markov reliability and availability models. Fault-tolerant systems. Reliability sensitivity and optimization. Network protection and restoration. Study cases in telecommunication networks. Availability data. Software reliability: models and evaluation methods. Software testing methods and dependability.

General Competencies

Good understanding of reliability and availability performances on different levels of telecommunication systems and networks. Ability to model, analyse, and design reliable, available and resilient complex systems and networks, by using analytical and simulation methods and algorithms.

Learning Outcomes

  1. define reliability, availability and security
  2. match redundancy structures
  3. discuss failure diagnosis and self-diagnosis systems
  4. calculate availability of complex systems
  5. apply Markov reliability and availability models
  6. calculate network reliability and availability
  7. relate software testing process and software reliability
  8. evaluate software reliability models

Forms of Teaching


Teaching is organized in two cycles. First cycle includes 7 weeks of teaching and mid-term exam, and second cycle includes 6 weeks of teaching and final exam. Teaching is executed in 15 weeks with 3 hours of teaching per week.


Two exams - mid-term and final exams.


Excercises are included in lessons

Other Forms of Group and Self Study


Grading Method

By decision of the Faculty Council, in the academic year 2019/2020. the midterm exams are cancelled and the points assigned to that component are transferred to the final exam, unless the teachers have reassigned the points and the grading components differently. See the news for each course for information on knowledge rating.
Continuous Assessment Exam
Type Threshold Percent of Grade Threshold Percent of Grade
Homeworks 33 % 10 % 33 % 10 %
Class participation 0 % 10 % 0 % 10 %
Mid Term Exam: Written 50 % 30 % 0 %
Final Exam: Written 50 % 40 %
Final Exam: Oral 10 %
Exam: Written 50 % 70 %
Exam: Oral 10 %

Week by Week Schedule

  1. Basic definitions; Redundancy cost, Increasing reliability, Pierce law
  2. System, software, time and information redundancy; Quantitative calculation of F(t), R(t), f(t), h(t), MTTF, MTTR
  3. Serial and parallel structure; Hot and cold stand-by; r-of-n structure; N-modular redundancy; Superposition; Exercises
  4. Telecommunication network reliability definition; Topological parameters: connectivity, diameter and girth; Stochastic parameters
  5. Path and cut definition in graph; Semidual graph
  6. Abraham's algorithm, k-reliability, g-reliability , st-reliability
  7. Reliability sensitivity; Markov reliability model
  8. Mid-term exam
  9. System availability; Markov availability model
  10. Failure simulation, p-cycles
  11. Testing and fault diagnosis; Self-diagnostic systems
  12. Software testing process
  13. Software reliability
  14. Software security
  15. Final exam

Study Programmes

University graduate
Telecommunication and Informatics (profile)
Theoretical Course (2. semester)



H. T. Mouftah, P.-H. Ho (2002.), Optical Networks: Architecture and Survivability, Kluwer Academic Publishers
R. Bhandari (1999.), Survivable Networks: Algorithms for Diverse Routing, Kluwer Academic Publishers
M. L. Shooman (2002.), Reliability of Computer Systems and Networks: Fault Tolerance, Analysis, and Design, Wiley-Interscience
M. L. Shooman (1990.), Probabilistic Reliability: An Engineering Approach, Krieger Pub Co
P. Stavroulakis (ed.) (2003.), Reliability, Survivability and Quality of Large Scale Telecommunication Systems, John Wiley & Sons

Associate Lecturers


ID 34459
  Summer semester
L1 English Level
L2 e-Learning
45 Lectures
0 Exercises
0 Laboratory exercises
0 Project laboratory

Grading System

85 Excellent
75 Very Good
65 Good
50 Acceptable