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