Routing and Data Compression in SONET and Performance of LANs in Wide Area Network

Abstract

With the increasing growth and demand for capacity in national, regional, and even metropolitan optical networks, we are increasing the bandwidth of the channel so that more data can be sent in appropriate time duration. So transmission delay is the main problem to send a large amount of data. To overcome this problem data should be routed to the minimum possible route for this there are various routing protocols which can be used to route the data in optical networks. In this thesis we are using two routing protocol to send the data and analyzing the performance parameters such as end to end transmission delay and throughput of the network. The transmission delay is the main problem in today’s networks because everyone wants to transmit a large amount of data and this lead to high delay in the network. So data compression may be one alternative to this problem. In this thesis we are also seeing the usefulness of data compression in fast speed and slow speed SONET. By modeling and simulating fast speed and slow speed network in OPNET IT Guru, we observe the overall result that although the throughput between the switch and the client using compression is less than the throughput between the switch and the client that is not using the compression, the response time for the client using compression is higher. In other words, the client loses more time for the compression and decompression processes than it gains from the transmission of the smaller frames. So we can say that there is no need to transmit the compressed data in the high speed network because it transmits uncompressed data to higher speed than the compressed data as compression and decompression of data takes relatively more time. But we also observe that data compression improves the throughput of the high speed network which is the main advantage of data compression. Wide Area Network (WAN) is a computer network that covers a broad area. So WANs are used to connect LANs and other types of networks together, so that users and computers in one location can communicate with users and computers in other locations. To increase the performance of the WAN it is necessary to connect this with the LANs which are having the better performance. Finally in this thesis we will see the performance of different types of LANs in wide area network. There are various types of v LANs to which a wide area network can be connected such as 10BaseT, 100BaseT, Token Ring based LANs and FDDI based LANs etc. By modeling and simulating the wide area network connected with various LANs in OPNET IT Guru, the overall result demonstrate that FDDI based LAN achieves better performance among all types of LANs and is the least obtrusive on network operations.