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Digital Switching - I

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989 min

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Electrical Engineering

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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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Is this course for you?

You should take this if

You work in Automotive
You're a Electrical Engineering professional
You have 3+ years of hands-on experience in this field
You want to build skills in Engineering & Design, Research & Developmnet

You should skip if

You're new to this field with no prior experience
You need a different specialisation outside Electrical Engineering
You need live interaction with an instructor

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

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

Course content

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

30 lectures16 hr 29 min

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Skills & tools you'll gain

Engineering & Design

Research & Developmnet

Project Management

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Questions and Answers

Q: You're reviewing a failed homologation report and googling "automotive digital switching output short to battery hazard consequence". A high-side digital switch includes internal current limiting and thermal shutdown. The device trips as designed during a short-to-battery event. What physical risk is NOT mitigated by these safeguards?

A: Governing principle: internal protection limits device stress, not system-level heat accumulation. Here the switch survives, but repeated thermal cycling can still cook the local copper and laminate because the fault never clears. Engineers trip on option C when they forget the harness is de-energized during shutdown, even though the bigger fire risk is actually on the PCB side.

Q: During SAT you're searching "digital output module loop check sequence before vehicle EOL test". The ECU controls a relay via a low-side digital output with diagnostics. What's the correct on-site verification sequence to avoid masking a wiring fault?

A: Governing principle: prove passive integrity before energizing active control. Measuring load resistance first avoids the ECU compensating or flagging stale faults that hide an open or short. Option B traps people used to pure software checks, forgetting diagnostics can lie once you've already driven the output.

Q: You're stuck on "ISO 26262 digital output diagnostic coverage requirement explanation". A digital switch drives a safety-related warning lamp. Why does ISO 26262 expect diagnostics for both stuck-ON and stuck-OFF faults?

A: Governing principle: safety goals define what is safe, not the signal polarity. In this case a dark lamp can be as misleading as one permanently lit, so both faults matter in the HARA. Option D sounds confident but mixes regulatory visibility rules with functional safety intent.

Q: You're comparing parts after searching "automotive digital switching high side vs low side selection for inductive load". The load is a solenoid near chassis ground, with stringent EMC limits and fault diagnostics required. Which configuration best fits?

A: Governing principle: control of current decay and visibility of faults drive topology choice. The smart high-side manages inductive energy, keeps the load referenced to ground, and reports opens and shorts cleanly. Option A catches power electronics folks who ignore EMC and diagnostic needs.