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Download TSSN Tutorial (PDF Version) TSSN i TSSN About the Tutorial This tutorial will help you understand the different aspects of telecommunication switching systems. It is designed to deliver knowledge about the basic concepts of telephony. Audience A beginner who is interested in the fundamentals of telephony can go ahead with this tutorial, with even little knowledge in communications. Prerequisites It is highly recommended that a reader of this tutorial has prior knowledge about what is telecommunication and how it works. Copyright & Disclaimer Copyright 2017 by Tutorials Point (I) Pvt. Ltd. All the content and graphics published in this e-book are the property of Tutorials Point (I) Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish any contents or a part of contents of this e-book in any manner without written consent of the publisher. We strive to update the contents of our website and tutorials as timely and as precisely as possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt. Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our website or its contents including this tutorial. If you discover any errors on our website or in this tutorial, please notify us at [email protected] i TSSN Table of Contents About the Tutorial ............................................................................................................................................ i Audience ........................................................................................................................................................... i Prerequisites ..................................................................................................................................................... i Copyright & Disclaimer ..................................................................................................................................... i Table of Contents ............................................................................................................................................ ii 1. TSSN – Introduction .................................................................................................................................. 1 Telecommunications ....................................................................................................................................... 1 2. TSSN – Switching Systems ......................................................................................................................... 5 Classification of Switching Systems ................................................................................................................. 5 Electromechanical Switching Systems ............................................................................................................. 6 Electronic Switching Systems .......................................................................................................................... 6 Telecommunication Network .......................................................................................................................... 6 Basics of a Switching System ........................................................................................................................... 7 Folded Network ............................................................................................................................................... 8 Blocking Network ............................................................................................................................................ 9 3. TSSN – Elements of a Switching System .................................................................................................. 10 Switching System ........................................................................................................................................... 10 4. TSSN – Strowger Switching System ......................................................................................................... 13 Automatic Switching System ......................................................................................................................... 13 Rotary Dial Telephone ................................................................................................................................... 14 Signaling Tones .............................................................................................................................................. 17 SWITCHING MECHANISMS ........................................................................................................ 20 5. TSSN – Switching Mechanisms ................................................................................................................ 21 6. TSSN – Common Control Subsystem ....................................................................................................... 30 Common Control Subsystem ......................................................................................................................... 31 7. Touch-tone Dial Telephone ..................................................................................................................... 34 ii TSSN Need for Touch-tone ..................................................................................................................................... 34 How does the Touch-tone Dial Telephone Operate? .................................................................................... 35 8. Crossbar Switching .................................................................................................................................. 40 The Features of Crossbar Switches ................................................................................................................ 40 Crossbar Switching Matrix ............................................................................................................................. 40 Diagonal Crosspoint Matrix ........................................................................................................................... 42 9. TSSN – Crossbar Switch Configurations ................................................................................................... 45 Blocking Crossbar Switches ........................................................................................................................... 45 Transfer Line Support .................................................................................................................................... 47 10. TSSN – Crosspoint Technology ................................................................................................................ 49 Challenges for the Crosspoint Technology .................................................................................................... 49 Electromechanical Crosspoint Technology .................................................................................................... 49 Crossbar Exchange Organization ................................................................................................................... 51 Call Processing ............................................................................................................................................... 51 11. TSSN – Stored Program Control ............................................................................................................... 53 Centralized SPC .............................................................................................................................................. 53 Distributed SPC .............................................................................................................................................. 55 12. TSSN – Software Architecture ................................................................................................................. 56 Process in a Multiprogramming Environment ............................................................................................... 56 Process Control Block .................................................................................................................................... 57 Multi-Stage Networks .................................................................................................................................... 60 13. TSSN – Switching Techniques .................................................................................................................. 63 Network Traffic .............................................................................................................................................. 66 14. Time Division Switching .......................................................................................................................... 68 Space Division Switching ............................................................................................................................... 68 Time Division Switching ................................................................................................................................. 69 Time Division Space Switching ...................................................................................................................... 70 Time Division Time Switching .......................................................................................................................
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