Performance Metrics of ATM & IP Network for Multiple Profiles with 99% Background Utilization of Link

This paper investigates the performance metrics end-to-end delay and response time for pure ATM, pure IP networking technologies for multiple profiles with 99 percent background utilization of link. To study the said metrics a university network of size 1000 km X 2000 km geographical area has been considered with University and four zones in the top most layer with varying distances of 20 kms, 800 kms, 900 kms and 1000 kms respectively followed by college layer comprising of distance 10 kms and 250 kms and bottommost layer, department layer consisting of three departments represented typically by Dept_EC, Dept_CS and Dept_CV. Each department is capable of handling the multimedia traffic for multiple profiles. The model has been built andsimulated using OPNET IT Guru Academic Edition 9.1, to study the performance metrics for data rate, OC3 (149Mbps) for ATM network and 100 Mbps for IP network. A G711 and G723.1 encoder scheme has been used for voice, low and high resolution for video and low and high load has been used for FTP and EMAIL. The results of simulation indicate that pure ATM has better performance compared to pure IP network with respect to voice and video due to prior path establishment feature in ATM. The large delay offset included in ATM is for the reservation of network resources to assure quality of voice and video information. The response time of pure ATM network is better compared to pure IP network due to random path detection in IP networks