The introduction of computers and software engineering in telephone
switching systems has dictated the need for powerful design aids
for such complex systems. Among these design aids simulators -
real-time environment simulators and flat-level simulators - have
been found particularly useful in stored program controlled switching
systems design and evaluation. However, both types of simulators
suffer from certain disadvantages.
An alternative methodology to the simulation of stored program
controlled switching systems is proposed in this research. The
methodology is based on the development of a process-based multilevel
hierarchically structured software simulator. This methodology
eliminates the disadvantages of environment and flat-level simulators.
It enables the modelling of the system in a 1 to 1 transformation
process retaining the sub-systems interfaces and, hence, making it
easier to see the resemblance between the model and modelled system
and to incorporate design modifications and/or additions in the
simulator.
This methodology has been applied in building a simulation package
for the System X family of exchanges. The Processor Utility Sub-system
used to control the exchanges is first simulated, verified and validated.
The application sub-systems models are then added one level higher_,
resulting in an open-ended simulator having sub-systems models at
different levels of detail and capable of simulating any member of the
System X family of exchanges. The viability of the methodology is
demonstrated by conducting experiments to tune the real-time operating
system and by simulating a particular exchange - The Digital Main
Network Switching Centre - in order to determine its performance
characteristics.
Date of Award | 1981 |
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Original language | English |
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Awarding Institution | |
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SIMULATION OF A MULTIPROCESSOR COMPUTER SYSTEM
SALIH, A. M. (Author). 1981
Student thesis: PhD