主要介绍了吉比特无源光网络系统中光网络单元升级的技术背景及基本原理,分析了光线路终端的带内、带外两种控制模式,并对传统升级方式做了详细分析,发现传统升级方式有很多不足之处,造成了光网络单元升级速度上的瓶颈,提出了一种在带内控制模式下更快的升级光网络单元的设计思路；详细阐述了光网络设备管理和控制接口二层代理的解决方案和升级流程.%The upgrade technology of ONU (Optical Network Unit)in GPON (Gigabit Capable PON)system and basic principle are introducesd. The two control model with in-band and out-of-band of OLT( Optical line Terminal) and the details of the traditional upgrading process are analyzed. There are many defects of traditional upgrade, caused bottleneck for the upgrade speed of ONU. The solution of in-band control mode is adopted for the rapid upgrading of ONU. Details of the upgrading process of OMCI( ONT Management and Control Interface) L2 Proxy are described.
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