复用

zài guāng xiān shang jìn xíng tóng bù xìn xī chuán shū fù yòng yǐ jí jiāo chā lián jiē

在光纤上进行同步信息传输、复用以及交叉连接

transmit, multiplex, cross the synchronous information on the fiber

èr xiān shuāng xiàng fù yòng duàn bǎo hù huán

二纤双向复用段保护环

bi-directional multiplex section protection ring on 2-fiber