Reconfigurable fiber optic adapter

A reconfigurable fiber optic adapter adapted for connecting a male optical fiber connector and a female optical fiber connector together, comprising:

• a housing comprising a base portion, a first mating connection portion located at a front side of said base portion, a second mating connection portion located at an opposing rear side of said base portion, a passage extending through said first mating connection portion, said base portion and said second mating connection portion, two plug mouths respectively located in said first mating connection portion in communication between two opposite ends of said passage and the atmosphere, a first keyway and a second keyway longitudinally located in said passage at opposing top and bottom sides, two recesses respectively symmetrically located in opposing top and bottom sides of said first mating connection portion, two mounting groove units bilaterally located in each said recess, and two pairs of hook holes symmetrically and vertically located in the opposing top and bottom sides of said first mating connection portion in communication with said passage;
• and
• a first mating-connection control member and a second mating-connection control member respectively and exchangeably mounted in said two recesses of said housing, said first mating-connection control member and said second mating-connection control member each comprising a base panel mounted in the mounting groove units in the recess at one of the opposing top and bottom sides of said first mating connection portion of said housing and two hook rods bilaterally extended from said base panel and respectively hooked in the respective pair of hook holes in one of the opposing top and bottom sides of said first mating connection portion of said housing, said first mating-connection control member further comprising an Off key located on a bottom side of the base panel thereof and partially projecting into one of said first keyway and said second keyway, said second mating-connection control member further comprising an On key located on a bottom side of the base panel thereof and kept in flush with a bottom wall of one of said first keyway and said second keyway wherein said On key has a height smaller than said Off key, and is kept away from interfering with the sliding movement of a directional key of an external optic fiber connector in said first keyway or said second keyway.