Ekularn Dhavarudha, Chalie Charoenlarpnopparut, and Suwan Runggeratigul

pp. 459 - 460

Abstract

This paper presents a study of performance and cost analysis of optical circuit switching (OCS) and optical burst
switching (OBS) by proposing the clear images of their node architectures and cost formulations. Then, we apply service
level agreement (SLA) of the high quality of service application in the terms of network blocking probability and average
network delay to demonstrate OCS and OBS performances, their investment costs, and network dimensioning methodology.
Applying SLA to our studies can illustrate the impact of contention resolution and blocking resolution schemes to the
performances and costs of OBS and OCS, accordingly. The simulations illustrate that OBS applying WC gives the best
performance among all architectures deploying the same offered bandwidth. The investigations also show that WC is a major
technique contributing high performance gain to both OCS and OBS. Especially for OBS, WC is an important scheme allowing OBS high data grooming property as its performance gain contributing to OBS is much higher than those of OCS. For the
cost analysis, OCS is the most economic among all architectures. BA provides the most cost effectiveness among all OBS
contention resolution schemes. Lastly, FDL is the least cost effective scheme as it gives little performance enhancement but
adds more cost to the network.