Why enroll

People join this course to understand how telephone networks actually connect calls and messages behind the scenes. It helps them learn how modern digital switching systems replaced old mechanical exchanges, making communication faster and more reliable. The course builds strong basic knowledge of telecom systems, which is very useful for careers in networking and communication fields. Many students also take this course to prepare for exams in electronics and communication engineering. Overall, it helps learners develop practical understanding for designing, analyzing, and troubleshooting telecom systems in real life.

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Course content

The course is readily available, allowing learners to start and complete it at their own pace.

Digital Switching - I

30 Lectures

989 min

Introduction to Telephony and Networks
Preview
46 min
Strowger Automatic Exchange
26 min
Crossbar Switching
46 min
Logic Circuit for Crosspoint Operation
13 min
Introduction to Multistage Interconnection Networks
16 min
Blocking probability of crossbar switches
32 min
Call congestion and time congestion
17 min
Clos network
26 min
Lee's approximation
14 min
Karnaugh's approximation
50 min
Time switch
25 min
Time switch and Clos network
24 min
TST switch, Strictly Non-blocking network, Rearrangeably non-blocking network
34 min
Paull"s Matrix
34 min
f-way multicasting
29 min
Strictly sense non blocking multicasting switch
18 min
Rearrangeably non blocking networks
20 min
Slepian Duguid theorem, Paull's theorem
54 min
Paull's matrix for rearrangeabbly non blocking networks
13 min
Recursive construction; Crosspoint complexity for rearrangebly and strictly non-blocking networks
54 min
Cantor network
29 min
Wide-sense non blocking network
43 min
Example of wide -sense non-blocking switch
37 min
Packet Switching
32 min
Buffering strategies
40 min
Output Queued Switch
36 min
Input Queued Switch
37 min
Banyan Network, Delta Network
46 min
Shufflenet as Delta network
68 min
Performance analysis of crossbar and delta network
30 min

Course details

This course teaches you how modern telephone and data networks connect people and information using digital technology. It starts with the basic idea of a telephone network — how two phones get connected when you make a call — and explains what happens inside the big machines called switches that make that connection fast and accurate.You’ll learn the history and evolution of switching — from old electromechanical systems with relays and mechanical selectors, to fully digital switches that use computers and software to route calls. The course breaks down how different switching systems are designed, how calls are set up and torn down, and how networks handle many calls at once without confusion. It also introduces basic packet switching, which is the foundation of modern data networks like the Internet. Along the way you’ll explore fundamentals like signaling methods, blocking and non-blocking networks, and multistage switch designs. By the end, you’ll understand both theory and practical concepts used in real telecommunications systems.

Source: Digital Switching - I [Youtube Channel] NPTEL

Course suitable for

Automotive
Electrical
Engineering & Design
Research & Developmnet
Project Management

Key topics covered

Basics of telephone networks and why switching is needed
Difference between analog and digital switching systems
How telephone exchanges work at a high level
Structure of signaling systems in telecom networks
Principles of Strowger (step-by-step) automatic exchange
How crossbar switching systems operate
Logic circuits used for crosspoint switching
Pulse and message signaling methods
Introduction to time-division multiplexing (TDM)
Digital switching fabrics and their advantages
Blocking vs. non-blocking switch design
Call setup and teardown procedures in digital systems
Common channel signaling concepts
Stored program control (SPC) in exchanges
Reliability, maintenance, and faults in switching networks

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