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Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 1 
 
 
UNIVERSITY SYLLABUS 
PART - A 
UNIT – 1 DEVELOPMENTS OF TELECOMMUNICATIONS, Network structure, Network 
services, terminology, Regulation, Standards. Introduction to telecommunications transmission, 
Power levels, Four wire circuits, Digital transmission, FDM, TDM, PDH and SDH, 
Transmission performance. 
                                                                                                                        8 Hours 
UNIT – 2 EVOLUTION OF SWITCHING SYSTEMS: Introduction, Message switching, 
Circuit switching, Functions of switching systems, Distribution systems, Basics of crossbar 
systems, Electronic switching, Digital switching systems. 
4 Hours 
DIGITAL SWITCHING SYSTEMS: Fundamentals : Purpose of analysis, Basic central office 
linkages, Outside plant versus inside plant, Switching system hierarchy, Evolution of digital 
switching systems, Stored program control switching systems, Digital switching system 
fundamentals, Building blocks of a digital switching system, Basic call processing.  
4 Hours 
UNIT – 3 TELECOMMUNICATIONS TRAFFIC: Introduction, Unit of traffic, Congestion, 
Traffic measurement, Mathematical model, lost call systems, Queuing systems. 
6 Hours 
UNIT – 4 SWITCHING SYSTEMS: Introduction, Single stage networks, Grading, Link 
Systems, GOS of Linked systems.  
6 Hours 
PART - B 
UNIT – 5 TIME DIVISION SWITCHING: Introduction, space and time switching, Time 
switching networks, Synchronization. 
4 Hours 
 
UNIT – 6 SWITCHING SYSTEM SOFTWARE: Introduction, Scope, Basic software 
architecture, Operating systems, Database Management, Concept of generic program, Software 
Page 2


Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 1 
 
 
UNIVERSITY SYLLABUS 
PART - A 
UNIT – 1 DEVELOPMENTS OF TELECOMMUNICATIONS, Network structure, Network 
services, terminology, Regulation, Standards. Introduction to telecommunications transmission, 
Power levels, Four wire circuits, Digital transmission, FDM, TDM, PDH and SDH, 
Transmission performance. 
                                                                                                                        8 Hours 
UNIT – 2 EVOLUTION OF SWITCHING SYSTEMS: Introduction, Message switching, 
Circuit switching, Functions of switching systems, Distribution systems, Basics of crossbar 
systems, Electronic switching, Digital switching systems. 
4 Hours 
DIGITAL SWITCHING SYSTEMS: Fundamentals : Purpose of analysis, Basic central office 
linkages, Outside plant versus inside plant, Switching system hierarchy, Evolution of digital 
switching systems, Stored program control switching systems, Digital switching system 
fundamentals, Building blocks of a digital switching system, Basic call processing.  
4 Hours 
UNIT – 3 TELECOMMUNICATIONS TRAFFIC: Introduction, Unit of traffic, Congestion, 
Traffic measurement, Mathematical model, lost call systems, Queuing systems. 
6 Hours 
UNIT – 4 SWITCHING SYSTEMS: Introduction, Single stage networks, Grading, Link 
Systems, GOS of Linked systems.  
6 Hours 
PART - B 
UNIT – 5 TIME DIVISION SWITCHING: Introduction, space and time switching, Time 
switching networks, Synchronization. 
4 Hours 
 
UNIT – 6 SWITCHING SYSTEM SOFTWARE: Introduction, Scope, Basic software 
architecture, Operating systems, Database Management, Concept of generic program, Software 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 2 
 
 
architecture for level 1 control, Software architecture for level 2 control, Software architecture 
for level 3 control, Digital switching system software classification, Call models, Connect 
sequence, Software linkages during call, Call features, Feature flow diagram, Feature interaction.  
6 Hours 
UNIT – 7 MAINTENANCE OF DIGITAL SWITCHING SYSTEM: Introduction, Scope, 
Software maintenance, Interface of a typical digital switching system central office, System 
outage and its impact on digital switching system reliability, Impact of software patches on 
digital switching system maintainability, Embedded patcher concept, Growth of digital switching 
system central office, Generic program upgrade, A methodology for proper maintenance of 
digital switching system, Effect of firmware deployment on digital switching system, Firmware-
software coupling, Switching system maintainability metrics, Upgrade process success rate, 
Number of patches applied per year, Diagnostic resolution rate, Reported critical and major 
faults corrected, A strategy improving software quality, Program for software process 
improvement, Software processes improvement, Software processes, Metrics, Defect analysis, 
Defect analysis. 
8 Hours 
 
UNIT – 8 A GENERIC DIGITAL SWITCHING SYSTEM MODEL: Introduction, Scope, 
Hardware architecture, Software architecture, Recovery strategy, Simple call through a digital 
system, Common characteristics of digital switching systems. Analysis report. Reliability 
analysis. 
6 Hours 
TEXT BOOKS: 
1. Telecommunication and Switching, Traffic and Networks - J E Flood: Pearson 
Education, 2002. 
2. Digital Switching Systems, Syed R. Ali, TMH Ed 2002. 
REFERENCE BOOK: 
1. Digital Telephony - John C Bellamy: Wiley India 3
rd
 Ed, 2000. 
 
 
 
 
 
 
 
Page 3


Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 1 
 
 
UNIVERSITY SYLLABUS 
PART - A 
UNIT – 1 DEVELOPMENTS OF TELECOMMUNICATIONS, Network structure, Network 
services, terminology, Regulation, Standards. Introduction to telecommunications transmission, 
Power levels, Four wire circuits, Digital transmission, FDM, TDM, PDH and SDH, 
Transmission performance. 
                                                                                                                        8 Hours 
UNIT – 2 EVOLUTION OF SWITCHING SYSTEMS: Introduction, Message switching, 
Circuit switching, Functions of switching systems, Distribution systems, Basics of crossbar 
systems, Electronic switching, Digital switching systems. 
4 Hours 
DIGITAL SWITCHING SYSTEMS: Fundamentals : Purpose of analysis, Basic central office 
linkages, Outside plant versus inside plant, Switching system hierarchy, Evolution of digital 
switching systems, Stored program control switching systems, Digital switching system 
fundamentals, Building blocks of a digital switching system, Basic call processing.  
4 Hours 
UNIT – 3 TELECOMMUNICATIONS TRAFFIC: Introduction, Unit of traffic, Congestion, 
Traffic measurement, Mathematical model, lost call systems, Queuing systems. 
6 Hours 
UNIT – 4 SWITCHING SYSTEMS: Introduction, Single stage networks, Grading, Link 
Systems, GOS of Linked systems.  
6 Hours 
PART - B 
UNIT – 5 TIME DIVISION SWITCHING: Introduction, space and time switching, Time 
switching networks, Synchronization. 
4 Hours 
 
UNIT – 6 SWITCHING SYSTEM SOFTWARE: Introduction, Scope, Basic software 
architecture, Operating systems, Database Management, Concept of generic program, Software 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 2 
 
 
architecture for level 1 control, Software architecture for level 2 control, Software architecture 
for level 3 control, Digital switching system software classification, Call models, Connect 
sequence, Software linkages during call, Call features, Feature flow diagram, Feature interaction.  
6 Hours 
UNIT – 7 MAINTENANCE OF DIGITAL SWITCHING SYSTEM: Introduction, Scope, 
Software maintenance, Interface of a typical digital switching system central office, System 
outage and its impact on digital switching system reliability, Impact of software patches on 
digital switching system maintainability, Embedded patcher concept, Growth of digital switching 
system central office, Generic program upgrade, A methodology for proper maintenance of 
digital switching system, Effect of firmware deployment on digital switching system, Firmware-
software coupling, Switching system maintainability metrics, Upgrade process success rate, 
Number of patches applied per year, Diagnostic resolution rate, Reported critical and major 
faults corrected, A strategy improving software quality, Program for software process 
improvement, Software processes improvement, Software processes, Metrics, Defect analysis, 
Defect analysis. 
8 Hours 
 
UNIT – 8 A GENERIC DIGITAL SWITCHING SYSTEM MODEL: Introduction, Scope, 
Hardware architecture, Software architecture, Recovery strategy, Simple call through a digital 
system, Common characteristics of digital switching systems. Analysis report. Reliability 
analysis. 
6 Hours 
TEXT BOOKS: 
1. Telecommunication and Switching, Traffic and Networks - J E Flood: Pearson 
Education, 2002. 
2. Digital Switching Systems, Syed R. Ali, TMH Ed 2002. 
REFERENCE BOOK: 
1. Digital Telephony - John C Bellamy: Wiley India 3
rd
 Ed, 2000. 
 
 
 
 
 
 
 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 3 
 
 
 
INDEX SHEET 
 
SL.NO TOPIC 
PAGE 
NO. 
PART – A   
UNIT 1: DEVELOPMENTS OF TELECOMMUNICATIONS: 
1.  Network structure, Network services 6-17 
2.  terminology, Regulation, Standards 17-18 
3.  Power levels, Four wire circuits 18-21 
4.  Digital transmission, FDM ,TDM, PDH and SDH 21-25 
UNIT 2: EVOLUTION OF SWITCHING SYSTEMS: 
1 Introduction, 26 
2 Message switching 28 
3 Circuit switching 29 
4 Functions of switching systems 29-30 
5 Distribution systems: Electronic switching 30-31 
6 Digital switching systems 31-32 
7 Basics of crossbar systems 32-38 
DIGITAL SWITCHING SYSTEMS 
1.  Fundamentals : Purpose of analysis 38 
2.  Basic central office linkages 39-40 
3.  Outside plant versus inside plant 41 
4.  Switching system hierarchy 41-43 
5.  Evolution of digital switching systems 43 
6.  Stored program control switching systems 43-44 
7.  switching system fundamentals 44-46 
8.  Building blocks of a digital switching system 46-50 
9.   Basic call processing 50-53 
UNIT 3: TELECOMMUNICATIONS TRAFFIC: 
1.  Introduction 53 
2.  Unit of traffic 54-55 
3.  Congestion 56 
4.  Traffic measurement 56 
5.  Mathematical model 57-61 
6.  lost call systems 61 
7.  Queuing systems 62-65 
8.  problems 65-68 
UNIT 4: SWITCHING SYSTEMS: 
1.  Introduction 68 
2.  Single stage networks 69 
Page 4


Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 1 
 
 
UNIVERSITY SYLLABUS 
PART - A 
UNIT – 1 DEVELOPMENTS OF TELECOMMUNICATIONS, Network structure, Network 
services, terminology, Regulation, Standards. Introduction to telecommunications transmission, 
Power levels, Four wire circuits, Digital transmission, FDM, TDM, PDH and SDH, 
Transmission performance. 
                                                                                                                        8 Hours 
UNIT – 2 EVOLUTION OF SWITCHING SYSTEMS: Introduction, Message switching, 
Circuit switching, Functions of switching systems, Distribution systems, Basics of crossbar 
systems, Electronic switching, Digital switching systems. 
4 Hours 
DIGITAL SWITCHING SYSTEMS: Fundamentals : Purpose of analysis, Basic central office 
linkages, Outside plant versus inside plant, Switching system hierarchy, Evolution of digital 
switching systems, Stored program control switching systems, Digital switching system 
fundamentals, Building blocks of a digital switching system, Basic call processing.  
4 Hours 
UNIT – 3 TELECOMMUNICATIONS TRAFFIC: Introduction, Unit of traffic, Congestion, 
Traffic measurement, Mathematical model, lost call systems, Queuing systems. 
6 Hours 
UNIT – 4 SWITCHING SYSTEMS: Introduction, Single stage networks, Grading, Link 
Systems, GOS of Linked systems.  
6 Hours 
PART - B 
UNIT – 5 TIME DIVISION SWITCHING: Introduction, space and time switching, Time 
switching networks, Synchronization. 
4 Hours 
 
UNIT – 6 SWITCHING SYSTEM SOFTWARE: Introduction, Scope, Basic software 
architecture, Operating systems, Database Management, Concept of generic program, Software 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 2 
 
 
architecture for level 1 control, Software architecture for level 2 control, Software architecture 
for level 3 control, Digital switching system software classification, Call models, Connect 
sequence, Software linkages during call, Call features, Feature flow diagram, Feature interaction.  
6 Hours 
UNIT – 7 MAINTENANCE OF DIGITAL SWITCHING SYSTEM: Introduction, Scope, 
Software maintenance, Interface of a typical digital switching system central office, System 
outage and its impact on digital switching system reliability, Impact of software patches on 
digital switching system maintainability, Embedded patcher concept, Growth of digital switching 
system central office, Generic program upgrade, A methodology for proper maintenance of 
digital switching system, Effect of firmware deployment on digital switching system, Firmware-
software coupling, Switching system maintainability metrics, Upgrade process success rate, 
Number of patches applied per year, Diagnostic resolution rate, Reported critical and major 
faults corrected, A strategy improving software quality, Program for software process 
improvement, Software processes improvement, Software processes, Metrics, Defect analysis, 
Defect analysis. 
8 Hours 
 
UNIT – 8 A GENERIC DIGITAL SWITCHING SYSTEM MODEL: Introduction, Scope, 
Hardware architecture, Software architecture, Recovery strategy, Simple call through a digital 
system, Common characteristics of digital switching systems. Analysis report. Reliability 
analysis. 
6 Hours 
TEXT BOOKS: 
1. Telecommunication and Switching, Traffic and Networks - J E Flood: Pearson 
Education, 2002. 
2. Digital Switching Systems, Syed R. Ali, TMH Ed 2002. 
REFERENCE BOOK: 
1. Digital Telephony - John C Bellamy: Wiley India 3
rd
 Ed, 2000. 
 
 
 
 
 
 
 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 3 
 
 
 
INDEX SHEET 
 
SL.NO TOPIC 
PAGE 
NO. 
PART – A   
UNIT 1: DEVELOPMENTS OF TELECOMMUNICATIONS: 
1.  Network structure, Network services 6-17 
2.  terminology, Regulation, Standards 17-18 
3.  Power levels, Four wire circuits 18-21 
4.  Digital transmission, FDM ,TDM, PDH and SDH 21-25 
UNIT 2: EVOLUTION OF SWITCHING SYSTEMS: 
1 Introduction, 26 
2 Message switching 28 
3 Circuit switching 29 
4 Functions of switching systems 29-30 
5 Distribution systems: Electronic switching 30-31 
6 Digital switching systems 31-32 
7 Basics of crossbar systems 32-38 
DIGITAL SWITCHING SYSTEMS 
1.  Fundamentals : Purpose of analysis 38 
2.  Basic central office linkages 39-40 
3.  Outside plant versus inside plant 41 
4.  Switching system hierarchy 41-43 
5.  Evolution of digital switching systems 43 
6.  Stored program control switching systems 43-44 
7.  switching system fundamentals 44-46 
8.  Building blocks of a digital switching system 46-50 
9.   Basic call processing 50-53 
UNIT 3: TELECOMMUNICATIONS TRAFFIC: 
1.  Introduction 53 
2.  Unit of traffic 54-55 
3.  Congestion 56 
4.  Traffic measurement 56 
5.  Mathematical model 57-61 
6.  lost call systems 61 
7.  Queuing systems 62-65 
8.  problems 65-68 
UNIT 4: SWITCHING SYSTEMS: 
1.  Introduction 68 
2.  Single stage networks 69 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 4 
 
 
3.  Grading 69-73 
4.  Link Systems 73-81 
5.  GOS of Linked systems 81-82 
PART – B : 
UNIT 5: TIME DIVISION SWITCHING 
1.  Introduction, 82 
2.  space and time switching 83-85 
3.  Time switching networks 85-88 
4.  Synchronization 88-90 
UNIT 6: SWITCHING SYSTEM SOFTWARE: 
1.  Introduction 91 
2.  Scope 91 
3.  Basic software architecture 91-92 
4.  Operating systems 92-94 
5.  Database Management 94 
6.  Concept of generic program 94-95 
7.  Software architecture for level 1 control 95-96 
8.   Software architecture for level 2 control 96-97 
9.  Software architecture for level 3 control 97 
10.  Digital switching system software classification 98-102 
11.  Call models 102 
12.  Connect sequence 102-104 
13.  Software linkages during call 104-105 
14.  Call features 105-106 
15.  Feature flow diagram 106-107 
16.  Feature interaction 107 
UNIT 7: MAINTENANCE OF DIGITAL SWITCHING SYSTEM: 
1.  Introduction 108 
2.  Scope 108 
3.  Software maintenance 108-109 
4.  Interface of a typical digital switching system central office 109-111 
5.  System outage and its impact on digital switching system reliability 111-112 
6.  Impact of software patches on digital switching system maintainability 112-113 
7.  Embedded patcher concept 113 
8.  Growth of digital switching system central office 113 
9.  Generic program upgrade 114 
10.  A methodology for proper maintenance of digital switching system 114-115 
11.  Effect of firmware deployment on digital switching system 116 
12.  Firmware-software coupling 116-117 
13.  Switching system maintainability metrics 117 
Page 5


Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 1 
 
 
UNIVERSITY SYLLABUS 
PART - A 
UNIT – 1 DEVELOPMENTS OF TELECOMMUNICATIONS, Network structure, Network 
services, terminology, Regulation, Standards. Introduction to telecommunications transmission, 
Power levels, Four wire circuits, Digital transmission, FDM, TDM, PDH and SDH, 
Transmission performance. 
                                                                                                                        8 Hours 
UNIT – 2 EVOLUTION OF SWITCHING SYSTEMS: Introduction, Message switching, 
Circuit switching, Functions of switching systems, Distribution systems, Basics of crossbar 
systems, Electronic switching, Digital switching systems. 
4 Hours 
DIGITAL SWITCHING SYSTEMS: Fundamentals : Purpose of analysis, Basic central office 
linkages, Outside plant versus inside plant, Switching system hierarchy, Evolution of digital 
switching systems, Stored program control switching systems, Digital switching system 
fundamentals, Building blocks of a digital switching system, Basic call processing.  
4 Hours 
UNIT – 3 TELECOMMUNICATIONS TRAFFIC: Introduction, Unit of traffic, Congestion, 
Traffic measurement, Mathematical model, lost call systems, Queuing systems. 
6 Hours 
UNIT – 4 SWITCHING SYSTEMS: Introduction, Single stage networks, Grading, Link 
Systems, GOS of Linked systems.  
6 Hours 
PART - B 
UNIT – 5 TIME DIVISION SWITCHING: Introduction, space and time switching, Time 
switching networks, Synchronization. 
4 Hours 
 
UNIT – 6 SWITCHING SYSTEM SOFTWARE: Introduction, Scope, Basic software 
architecture, Operating systems, Database Management, Concept of generic program, Software 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 2 
 
 
architecture for level 1 control, Software architecture for level 2 control, Software architecture 
for level 3 control, Digital switching system software classification, Call models, Connect 
sequence, Software linkages during call, Call features, Feature flow diagram, Feature interaction.  
6 Hours 
UNIT – 7 MAINTENANCE OF DIGITAL SWITCHING SYSTEM: Introduction, Scope, 
Software maintenance, Interface of a typical digital switching system central office, System 
outage and its impact on digital switching system reliability, Impact of software patches on 
digital switching system maintainability, Embedded patcher concept, Growth of digital switching 
system central office, Generic program upgrade, A methodology for proper maintenance of 
digital switching system, Effect of firmware deployment on digital switching system, Firmware-
software coupling, Switching system maintainability metrics, Upgrade process success rate, 
Number of patches applied per year, Diagnostic resolution rate, Reported critical and major 
faults corrected, A strategy improving software quality, Program for software process 
improvement, Software processes improvement, Software processes, Metrics, Defect analysis, 
Defect analysis. 
8 Hours 
 
UNIT – 8 A GENERIC DIGITAL SWITCHING SYSTEM MODEL: Introduction, Scope, 
Hardware architecture, Software architecture, Recovery strategy, Simple call through a digital 
system, Common characteristics of digital switching systems. Analysis report. Reliability 
analysis. 
6 Hours 
TEXT BOOKS: 
1. Telecommunication and Switching, Traffic and Networks - J E Flood: Pearson 
Education, 2002. 
2. Digital Switching Systems, Syed R. Ali, TMH Ed 2002. 
REFERENCE BOOK: 
1. Digital Telephony - John C Bellamy: Wiley India 3
rd
 Ed, 2000. 
 
 
 
 
 
 
 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 3 
 
 
 
INDEX SHEET 
 
SL.NO TOPIC 
PAGE 
NO. 
PART – A   
UNIT 1: DEVELOPMENTS OF TELECOMMUNICATIONS: 
1.  Network structure, Network services 6-17 
2.  terminology, Regulation, Standards 17-18 
3.  Power levels, Four wire circuits 18-21 
4.  Digital transmission, FDM ,TDM, PDH and SDH 21-25 
UNIT 2: EVOLUTION OF SWITCHING SYSTEMS: 
1 Introduction, 26 
2 Message switching 28 
3 Circuit switching 29 
4 Functions of switching systems 29-30 
5 Distribution systems: Electronic switching 30-31 
6 Digital switching systems 31-32 
7 Basics of crossbar systems 32-38 
DIGITAL SWITCHING SYSTEMS 
1.  Fundamentals : Purpose of analysis 38 
2.  Basic central office linkages 39-40 
3.  Outside plant versus inside plant 41 
4.  Switching system hierarchy 41-43 
5.  Evolution of digital switching systems 43 
6.  Stored program control switching systems 43-44 
7.  switching system fundamentals 44-46 
8.  Building blocks of a digital switching system 46-50 
9.   Basic call processing 50-53 
UNIT 3: TELECOMMUNICATIONS TRAFFIC: 
1.  Introduction 53 
2.  Unit of traffic 54-55 
3.  Congestion 56 
4.  Traffic measurement 56 
5.  Mathematical model 57-61 
6.  lost call systems 61 
7.  Queuing systems 62-65 
8.  problems 65-68 
UNIT 4: SWITCHING SYSTEMS: 
1.  Introduction 68 
2.  Single stage networks 69 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 4 
 
 
3.  Grading 69-73 
4.  Link Systems 73-81 
5.  GOS of Linked systems 81-82 
PART – B : 
UNIT 5: TIME DIVISION SWITCHING 
1.  Introduction, 82 
2.  space and time switching 83-85 
3.  Time switching networks 85-88 
4.  Synchronization 88-90 
UNIT 6: SWITCHING SYSTEM SOFTWARE: 
1.  Introduction 91 
2.  Scope 91 
3.  Basic software architecture 91-92 
4.  Operating systems 92-94 
5.  Database Management 94 
6.  Concept of generic program 94-95 
7.  Software architecture for level 1 control 95-96 
8.   Software architecture for level 2 control 96-97 
9.  Software architecture for level 3 control 97 
10.  Digital switching system software classification 98-102 
11.  Call models 102 
12.  Connect sequence 102-104 
13.  Software linkages during call 104-105 
14.  Call features 105-106 
15.  Feature flow diagram 106-107 
16.  Feature interaction 107 
UNIT 7: MAINTENANCE OF DIGITAL SWITCHING SYSTEM: 
1.  Introduction 108 
2.  Scope 108 
3.  Software maintenance 108-109 
4.  Interface of a typical digital switching system central office 109-111 
5.  System outage and its impact on digital switching system reliability 111-112 
6.  Impact of software patches on digital switching system maintainability 112-113 
7.  Embedded patcher concept 113 
8.  Growth of digital switching system central office 113 
9.  Generic program upgrade 114 
10.  A methodology for proper maintenance of digital switching system 114-115 
11.  Effect of firmware deployment on digital switching system 116 
12.  Firmware-software coupling 116-117 
13.  Switching system maintainability metrics 117 
Digital Switching System       10EC82      
                                                                  
 
ECE/SJBIT  Page 5 
 
 
14.  Upgrade process success rate 118 
15.  Number of patches applied per year 118-119 
16.  Diagnostic resolution rate 119 
17.  Reported critical and major faults corrected 119-120 
18.  A strategy improving software quality 120 
19.  Program for software process improvement 120-121 
20.  Software processes improvement 121 
21.  Software processes, Metrics 121-122 
22.  Defect analysis 122-124 
UNIT 8: A GENERIC DIGITAL SWITCHING SYSTEM MODEL: 
1.  Introduction 125 
2.  Scope 125 
3.  Hardware architecture 125-127 
4.  Software architecture 127-128 
5.  Recovery strategy 128-131 
6.  Simple call through a digital system 131-135 
7.  Common characteristics of digital switching systems 135-137 
8.  Analysis report 137 
9.  Reliability analysis 137-138 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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FAQs on DIGITAL_SWITCHING_SYSTEMS_10EC82 - IT & Software

1. What are digital switching systems?
Ans. Digital switching systems are telecommunication systems that allow multiple users to connect and communicate with each other through the use of digital signals. These systems use digital techniques to route and switch voice, data, and other types of information.
2. How do digital switching systems work?
Ans. Digital switching systems work by converting analog voice or data signals into digital form, which can then be processed and switched using digital circuitry. The systems use algorithms and protocols to route the digital signals to the appropriate destination, enabling communication between users.
3. What are the advantages of digital switching systems?
Ans. Some advantages of digital switching systems include improved call quality, increased capacity for handling multiple calls simultaneously, enhanced reliability and fault tolerance, and the ability to integrate with other digital communication technologies such as the internet.
4. What are the different types of digital switching systems?
Ans. There are several types of digital switching systems, including time-division multiplexing (TDM) systems, packet-switched systems, and circuit-switched systems. TDM systems divide the transmission medium into time slots to accommodate multiple calls, while packet-switched systems break data into packets for transmission. Circuit-switched systems establish a dedicated path for each call.
5. What are some applications of digital switching systems?
Ans. Digital switching systems are widely used in various applications, such as telephone networks, mobile communication networks, computer networks, and internet switching. They play a crucial role in enabling efficient and reliable communication between users in these systems.
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