17EC654 Digital Switching Systems syllabus for TE

DEVELOPMENT 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 (Text-1) L1, L2

EVOLUTION OF SWITCHING SYSTEMS:

Introduction, Message switching, Circuit switching, Functions of switching systems, Distribution systems, Basics of crossbar systems, Electronic switching.

DIGITAL SWITCHING SYSTEMS:

Switching system hierarchy, Evolution of digital switching systems, Stored program control switching systems, Building blocks of a digital switching system, Basic call processing. (Text-1 and 2) L1, L2

TELECOMMUNICATIONS TRAFFIC:

Introduction, Unit of traffic, Congestion, Traffic measurement, Mathematical model, lost call systems, Queuing systems.

SWITCHING SYSTEMS:

Introduction, Single stage networks, Gradings, Link Systems, GOS of Linked systems. (Text-1) L1, L2

TIME DIVISION SWITCHING:

Introduction, space and time switching, Time switching networks, Synchronisation.

SWITCHING SYSTEM SOFTWARE:

Introduction, Basic software architecture, Software architecture for level 1to 3 control, Digital switching system software classification, Call models, Software linkages during call, Feature flow diagram, Feature interaction. (Text-1 and 2) L1, L2

MAINTENANCE OF DIGITAL SWITCHING SYSTEM:

Introduction , 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, A methodology for proper maintenance of digital switching system

A GENERIC DIGITAL SWITCHING SYSTEM MODEL: Introduction, Hardware architecture, Software architecture, Recovery strategy, Simple call through a digital system, Common characteristics of digital switching systems. Reliability analysis. (Text-2) L1, L2

Course Outcomes:

At the end of the course, students should be able to:

• Describe the electromechanical switching systems and its comparison with the digital switching.
• Determine the telecommunication traffic and its measurements.
• Define the technologies associated with the data switching operations.
• Describe the software aspects of switching systems and its maintenance.

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:

Digital Telephony - John C Bellamy: Wiley India Pvt. Ltd, 3rd Ed, 2008.