利用业务调度算法实现不同业务等级间的动态带宽分配 ( DBA) ,从而保证接入业务的服务质量 ( Qo S) ,是异步转移模式无源光网络 ( APON)系统的关键技术之一 .文章所设计的APON系统业务调度算法 ,通过基本带宽分配和剩余带宽再分配实现了业务等级间的动态带宽分配 ,算法建模仿真和系统实际测试证明算法具有良好的性能 ,实现简单 ,可用性强 It is one of the key technologies of Asynchronous Transfer Mode Passive Optical Network (APON) that using service scheduling algorithm to realize Dynamic Bandwidth Allocation (DBA) among different service levels to ensure quality of service (QoS) of access service. The designed service scheduling algorithm of APON system realizes the dynamic bandwidth allocation between service levels through the basic bandwidth allocation and the remaining bandwidth redistribution. The algorithm modeling and simulation and the actual system testing prove that the algorithm has good performance, simple implementation and strong usability