Hardware Design And Application Of Burst Module In OBS Networks Edge Node

Optical Burst Switching (OBS) networks belong to those three optical switching networks which have been studied extensively in current days. It could provide rapid resource allocating and high network usage with relatively low optical technology, effectively support multiple services with high-speed network load and high burst arrival rate and mitigate the electronic bottleneck that confines the development of optical networks. Hence, it has attracted considerable research attention from both academic and industrial fields, and received considerable attention as one of the most promising technologies for supporting the next-generation Internet over wavelength division multiplexing (WDM) networks.An OBS networks is composed of edge nodes and the core nodes, the service access is performed at the edge nodes of the networks. In this paper, the edge node in optical burst switching (OBS) networks is studied, and a novel solution for how to implement the assembly module in the OBS edge node on hardware is introduced from the viewpoint of practicality. The main work and achievements are as follows:1. In the course of studying the assembly algorithms, the basic assembly algorithms are emphasized, and the assembly module can achieve three basic assembly algorithms: Fixed Burst Length (FBL), Fixed Assembly Period (FAP) and Min Burst Max Assembly Period (MBMAP). Unlike former solutions based on software simulation, this solution takes FPGA chip EP2C20Q240C8 as platform and uses Verilog HDL hardware language.2. Assembly module is divided into several modules in this paper, and every module is developed in detail using Verilog HDL based on QuartusⅡ. After synthesis, fitter, placing, routing, timing analyzer and numerous adjustments, the design in the EP2C20Q240C8 FPGA can work accurately as expected.3. Connect the modules into a system debugging on FPGA, and observe the waveforms through oscillograph. In the paper, FPGA implement details of the modules are described, actual debug results are shown, and then improvement methods to achieve higher performance are proposed. Timing analysis and waveforms from oscillograph show that this assembly module can achieve assembly algorithms function. Moreover the evaluation results of chip resources usages and delay can satisfy the requirement of OBS networks.