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a new way of highway speed control a new pattern for painting highways a new way of training drivers a new type of optical illusion
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光学（Optical） 手工（Manual） 韵律法（Metrics） 光学——罗马字符（Optical——Roman）
PrivateOptical Network Passive Optical Network Private Optical Node Protected Optical Node
OLT（Optical Line Terminal）－光线路终端 ONU（Optical NetworkUnit）－光网络单元 ONT（Optical Network Terminal）－光网络终端 ODN（Optical Distribution Network）－光分配网
a new way of highway speed control a new pattern for painting highways a new way of training drivers a new type of optical illusion
a new way of highway speed control a new pattern for painting highways a new way of training drivers a new type of optical illusion
GPON系统采用WDM技术，实现双纤双向传输 . 下行数据流采用广播技术 上行数据流采用TDMA技术 PON由光线路终端OLT （Optical Line Terminal ）、光网络单元ONU （Optical Network Unit ）和无源分光器POS（Passive Optical Splitter ）组成
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