HPON组播功能的设计与实现

Design and implementation of multicast in HPON

混合无源光网络(HPON)通过波分复用的方式提升了接入带宽,但其远端节点(RN)所采用的点到点拓扑结构不利于组播复制。针对这个特点,文章首先提出了基于HPON的组播实现方案,通过单拷贝广播(SCB)来提高组播复制效率;然后对原有的光线路终端(OLT)、RN和光网络单元(ONU)设备进行改进设计,实现对组播业务流的控制功能;最后对改进前后的系统进行组播性能对比测试。测试结果表明,该方案可以提高HPON的组播性能。

HPON increases access bandwidth by using the wavelength division multiplex technology.But the point-to-point topology of its RN affects the multicast replication.This paper presents an HPON-based multicast implementation scheme and enhances its efficiency using Single-Copy Broadcast（SCB）.And then it improves the functions and structures of the original OLT,RN and ONU,implementing the control of the multicast stream.Finally,it conducts comparison tests on the multicast performances of the system before and after the improvement.The results indicate that the design can improve the multicast performance of HPON.