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http://padom.ru/2017/04/22/%d0%be%d0%b4%d0%bd%d0%be%d0%bc%d0%be%d0%b4%d0%be%d0%b2%d1%8b%d0%b9-sm-%d0%b8-%d0%bc%d0%bd%d0%be%d0%b3%d0%be%d0%bc%d0%be%d0%b4%d0%be%d0%b2%d1%8b%d0%b9-mm-%d0%be%d0%bf%d1%82%d0%b8%d1%87%d0%b5%d1%81/
Одномодовый (SM) и многомодовый (MM) оптический кабель