Performance analysis of a local area network based on wavelength division multiplexing and asynchronous transfer mode
This work proposes a Local Area Network based on Wavelength Division Multiplexing (WDM) and Asynchronous Transfer Mode (ATM). The design optimizes the usage of the resources assigning different types of traffic to the two overlapping sub-networks. The ATM network handles control, regular low speed traffic and overflows of the WDM network. The WDM segment is a circuit-oriented network for high-speed capacity. A typical 64-Wavelength network could handle 8 thousand stations with very low blocking probability from the network. There is capacity for expansion if additional blocking is allowed or the traffic distribution is more concentrated in regions. ^ There are two types of channels. The common channel employs conventional ATM cells for all stations using a 1300nm-wavelength carrier. The other type of channel uses WDM at 1550nm band, and it is assigned dynamically on demand for very high-speed links. The power budgets and dispersion analysis allow distances of 2 km between stations supporting 2.5 Gbps channels. The ATM channels use standard 622 Mbps transmission. ^ The design has different hierarchical levels; the network is composed of clusters, segments and stations connected through Cell & Wavelength Switches. Those are devices that switch, between stations, the ATM cells and the WDM circuits. ^ We analyze the system assuming transactional data traffic because conventional continuous-rate service fits easily on the ATM channels. Our objective was to calculate the delay experienced by a piece of information, its blocking probability, and the occupation of the system under several loads. We propose a mathematical model using queuing theory and we correlated it with discrete simulations. ^ After the analysis and simulations, we observed that the inclusion of ATM for handling overflow traffic of the WDM network reduced the blocking probability with a slight increase of delay. In addition we evaluated the effect of having a queue for the assignment of WDM channels optimizing the delay. We conclude that the network is more efficient handling the traffic load compared with a simple circuit switched WDM network. ^
Engineering, Electronics and Electrical|Computer Science
Gonzalez-Lozano, Virgilio, "Performance analysis of a local area network based on wavelength division multiplexing and asynchronous transfer mode" (1999). ETD Collection for University of Texas, El Paso. AAI9937181.