单模模块插到交换机里，发现模块没有光，正常吗

单模模块插到交换机里面，发现模块里面没有光，是正常的吗?weibo.com/ttarticle/p/show?id=2309405159808180289710weibo.com/ttarticle/p/show?id=2309405159808230883634weibo.com/ttarticle/p/show?id=2309405159808285147402weibo.com/ttarticle/p/show?id=2309405159808335741020weibo.com/ttarticle/p/show?id=2309405159808385810459weibo.com/ttarticle/p/show?id=2309405159808436142165weibo.com/ttarticle/p/show?id=2309405159808486473846weibo.com/ttarticle/p/show?id=2309405159808537067554weibo.com/ttarticle/p/show?id=2309405159808583205150weibo.com/ttarticle/p/show?id=2309405159808633274597weibo.com/ttarticle/p/show?id=2309405159808683606340weibo.com/ttarticle/p/show?id=2309405159808734200159weibo.com/ttarticle/p/show?id=2309405159808784532203weibo.com/ttarticle/p/show?id=2309405159808839057434weibo.com/ttarticle/p/show?id=2309405159808885195040weibo.com/ttarticle/p/show?id=2309405159808935526600weibo.com/ttarticle/p/show?id=2309405159808985596280weibo.com/ttarticle/p/show?id=2309405159809036190105weibo.com/ttarticle/p/show?id=2309405159809086521516weibo.com/ttarticle/p/show?id=2309405159809136853455weibo.com/ttarticle/p/show?id=2309405159809187185009weibo.com/ttarticle/p/show?id=2309405159809237254210weibo.com/ttarticle/p/show?id=2309405159809287585815weibo.com/ttarticle/p/show?id=2309405159809338179728weibo.com/ttarticle/p/show?id=2309405159809388249109weibo.com/ttarticle/p/show?id=2309405159809438843002weibo.com/ttarticle/p/show?id=2309405159809489174716weibo.com/ttarticle/p/show?id=2309405159809539244278weibo.com/ttarticle/p/show?id=2309405159809589838018weibo.com/ttarticle/p/show?id=2309405159809640169638weibo.com/ttarticle/p/show?id=2309405159809690239077weibo.com/ttarticle/p/show?id=2309405159809740832865weibo.com/ttarticle/p/show?id=2309405159809786708460weibo.com/ttarticle/p/show?id=2309405159809837302543weibo.com/ttarticle/p/show?id=2309405159809887371495weibo.com/ttarticle/p/show?id=2309405159809937703075weibo.com/ttarticle/p/show?id=2309405159809988297005weibo.com/ttarticle/p/show?id=2309405159810038628416weibo.com/ttarticle/p/show?id=2309405159810088697997weibo.com/ttarticle/p/show?id=2309405159810139292091weibo.com/ttarticle/p/show?id=2309405159810189361244weibo.com/ttarticle/p/show?id=2309405159810239954975weibo.com/ttarticle/p/show?id=2309405159810286093163weibo.com/ttarticle/p/show?id=2309405159810336424787weibo.com/ttarticle/p/show?id=2309405159810390687860weibo.com/ttarticle/p/show?id=2309405159810441281693weibo.com/ttarticle/p/show?id=2309405159810491351062weibo.com/ttarticle/p/show?id=2309405159810541682692weibo.com/ttarticle/p/show?id=2309405159810588082416weibo.com/ttarticle/p/show?id=2309405159810638414054weibo.com/ttarticle/p/show?id=2309405159808188940534weibo.com/ttarticle/p/show?id=2309405159808243466517weibo.com/ttarticle/p/show?id=2309405159808293536007weibo.com/ttarticle/p/show?id=2309405159808344130095weibo.com/ttarticle/p/show?id=2309405159808394199155weibo.com/ttarticle/p/show?id=2309405159808444530735weibo.com/ttarticle/p/show?id=2309405159808494862355weibo.com/ttarticle/p/show?id=2309405159808541262661weibo.com/ttarticle/p/show?id=2309405159808591331680weibo.com/ttarticle/p/show?id=2309405159808641925409weibo.com/ttarticle/p/show?id=2309405159808692257091weibo.com/ttarticle/p/show?id=2309405159808742588487weibo.com/ttarticle/p/show?id=2309405159808792920103weibo.com/ttarticle/p/show?id=2309405159808838795514weibo.com/ttarticle/p/show?id=2309405159808889127066weibo.com/ttarticle/p/show?id=2309405159808939720708weibo.com/ttarticle/p/show?id=2309405159808985858971weibo.com/ttarticle/p/show?id=2309405159809036189890weibo.com/ttarticle/p/show?id=2309405159809086521536weibo.com/ttarticle/p/show?id=2309405159809136590943weibo.com/ttarticle/p/show?id=2309405159809186922514weibo.com/ttarticle/p/show?id=2309405159809237254154weibo.com/ttarticle/p/show?id=2309405159809283654545weibo.com/ttarticle/p/show?id=2309405159809333723297weibo.com/ttarticle/p/show?id=2309405159809384317367weibo.com/ttarticle/p/show?id=2309405159809434648731weibo.com/ttarticle/p/show?id=2309405159809480786338weibo.com/ttarticle/p/show?id=2309405159809530855583weibo.com/ttarticle/p/show?id=2309405159809581449561weibo.com/ttarticle/p/show?id=2309405159809631518727weibo.com/ttarticle/p/show?id=2309405159809677656263weibo.com/ttarticle/p/show?id=2309405159809728250147weibo.com/ttarticle/p/show?id=2309405159809774388049weibo.com/ttarticle/p/show?id=2309405159809824456903weibo.com/ttarticle/p/show?id=2309405159809875050596weibo.com/ttarticle/p/show?id=2309405159809925382401weibo.com/ttarticle/p/show?id=2309405159809975451669weibo.com/ttarticle/p/show?id=2309405159810021589479weibo.com/ttarticle/p/show?id=2309405159810072183002weibo.com/ttarticle/p/show?id=2309405159810122514602weibo.com/ttarticle/p/show?id=2309405159810172583965weibo.com/ttarticle/p/show?id=2309405159810218984171weibo.com/ttarticle/p/show?id=2309405159810269315547weibo.com/ttarticle/p/show?id=2309405159810319384630weibo.com/ttarticle/p/show?id=2309405159810365784348weibo.com/ttarticle/p/show?id=23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