Degree Type


Date of Award


Degree Name

Doctor of Philosophy


Electrical and Computer Engineering

First Advisor

Douglas W. Jacobson

Second Advisor

Arthur V. Pohm


A significant portion of the contemporary research efforts in the area of data communications and computer networking is devoted to Local Area Networks (LANs) and Integrated Services Digital Networks (ISDNs). Both, ISDN and LAN, are being developed to satisfy the key requirements of their specific applications. This application specific development has created a semantic gap between ISDN and LANs. Consequently, an extensive mapping is required to interface an ISDN with a LAN. Obviously, such mapping may limit the overall performance of a LAN;In this dissertation, a Medium Access and Control Strategy (MACS) is proposed that does not require a complex ISDN/LAN interface and extends the ISDN services to a LAN user without degrading the performance of the LAN. The proposed MACS is distributed in nature, supports a prioritized realtime traffic (using dynamically controlled target token rotation time), provides packet switching and circuit switching facilities, and can be implemented on a single ring topology;The analysis of the strategy indicates that a channel capacity of 64 Kbps is sufficient to carry the control and signalling information for 100 stations. The simulation results show that the network performance is drastically degraded at lower values of the target token rotation time. The proposed strategy solves this problem by dynamically adjusting the target token rotation time.



Digital Repository @ Iowa State University,

Copyright Owner

Muhammad Shafiq



Proquest ID


File Format


File Size

110 pages