【摘要】 首先分析了EPON系统中IPACT MAC协议,然后提出一种改进的MAC协议。该协议根据服务等级协议(SLA)以动态带宽分配方式对于带宽需求不同的用户分配不等的可用带宽,采用固定周期轮询,并改进授权表的产生方法。最后给出了实验仿真,结果表明该改进协议减少了在不同光网络单元(ONU)数据传输时的平均时延和丢包率,提高了在不同授权方法时的吞吐量。更多还原

【Abstract】 The paper analyses firstly IPACT MAC protocol of EPON system,and then puts forward a kind of improved protocol,it distributes the different portion of guaranteed bandwidth to each users with the different need based on SEA,adopts fixed cycle polling and improves the generation method of authorization tables,The paper finally gives its experiment on the Delay and Packet Loss Rate of the different ONU,the Handling Capacity of the different authorization methods,the results demonstrate this protocol has more superiority.更多还原