欧洲电信标准（ETS）草案定义了光分配网络（ODN），它是光网络单元（ONU）和光线路终端（OLT）之间的光接入网络（OAN）的一部分。根据ETS 300 463中规定的功能要求，本ETS主要解决与OAN中交互服务传输相关的光学方面。还考虑了与分布式服务对应的信号传输相关的光学方面，这可能会影响这种类型ODN的定义（例如，使用光放大），即使在某些情况下需要进一步研究。

This draft European Telecommunication Standard (ETS) defines the Optical Distribution Network (ODN) which is that part of the Optical Access Network (OAN) between the Optical Network Unit (ONU) and the Optical Line Terminal (OLT). This ETS primarily addresses the optical aspects related to the transmission of the interactive services in an OAN according to the functional requirements specified in ETS 300 463. Optical aspects related to the transmission of signals corresponding to distributive services, which may have impact on the definition of this type of ODN (e.g. the use of Optical Amplification) are also taken into account, even if further studies are required in some cases.