06EC55 - DIGITAL SWITCHING SYSTEMS |
PART – A |
UNIT – I |
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. |
UNIT – II |
EVOLUTION OF SWITCHING SYSTEMS:Introduction, Message
switching, Circuit switching, Functions of switching systems, Distribution
systems, Basics of crossbar systems, Electronic switching, Digital switching
systems.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. |
UNIT – III TELECOMMUNICATIONS TRAFFIC: |
Introduction, Unit of traffic,
Congestion, Traffic measurement, Mathematical model, lost call systems,
Queuing systems. |
UNIT – IV SWITCHING SYSTEMS: |
Introduction, Single stage networks, Gradings,
Link Systems, GOS of Linked systems. |
PART – B |
UNIT – V TIME DIVISION SWITCHING: |
Introduction, space and time switching,
Time switching networks, Synchronisation. |
UNIT – VI SWITCHING SYSTEM SOFTWARE: |
Introduction, Scope, Basic
software architecture, Operating systems, Database Management, Concept of
generic program, Software 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. |
UNIT – VII 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. |
UNIT – VIII 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. |
REFERENCE |
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 Books |
1. Digital Telephony - John C Bellamy: Wiley India 3rd Ed, 2000. |
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