Optical Transmission unit, which is an important sub-function unit of OADM device and OXC device.
光信号转发单元，是光传送网设备OADM和OXC的重要组成部分。
Upon approval, the business unit shall continue to organize the implementation of the sub project;
经同意后，业务单位继续组织子项目实施；
Upon approval, the business unit shall continue to organize the implementation of the sub project;
经同意后，业务单位继续组织子项目实施；
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