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Course Detail

Course Name Digital Telephony
Course Code 15ECE346
Program B. Tech. in Electronics and Communication Engineering
Year Taught 2019


Unit 1

Telephony Background: An overview of telephone networks – Transmission system – Basic switching system – Signaling – Echo cancellation – Working principles of telephone – DC (pulse) and DTMF (tone) – Signaling – Digital Switching Systems. Traffic Analysis: Traffic characterization – Loss systems – Network blocking probabilities – Delay systems (queuing system) – Queues in tandem.

Unit 2

Switching: Single stage – Grading – Progressive grading – Traffic capacity of grading – Applications – Link systems. Space/Time Division Switching: Space switch – Time switch and their design – Hybrid switches – Concentrator and switching components – PBX switches – Digital cross connect – Time division switching: Space and time division switching – General space switches – Time switches – Time division switching networks – Basic networks – Bidirectional pass – Complex switching networks – Concentrators – PBX switches – Digital cross connect units – Grades of services of time division switching networks.

Unit 3

Switching Control: Call processing – Signal exchanges – Signal operations – Common control – Reliability – Availability and security – Network synchronization – Network control network management. Digital Network and Signaling: Integrated service digital network (ISDN) – ISDN overview – ISDN interfaces and functions – User network interface – ISDN protocol architecture. Signaling System Number 7 (SS7): SS7 architecture signaling date link level – signaling link level – Network level – Signaling connection control part.

Text Books

  1. J E Flood, “Telecommunication Switching, Traffic and Networks”, Pearson Education, 2003
  2. John C Bellamy, “Digital Telephony”, Third Edition, John Wiley and Sons, 2002


  1. illiam Stalling, “ISDN and Broadband ISDN with Frame Relay and ATM”, Fourth Edition, Pearson education Asia publication.
  2. Thiagarajan Viswanathan, “Telecommunication Switching and Networks”, PHI Publication

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