The name MT-RJ comes that MTRJ fiber optic connector is developed from MT type and RJ type connectors. MT-RJ features two-fiber connection, that is to say ,two fiberglass connection within one MT-RJ fiber optic connector. another special point is MT-RJ is with plastic housing and plastic ferrule. there are female type MT-RJ fiber optic patch cords and male type MT-RJ fiber optic patch cords, the difference is male type MT-RJ is with two pins on each of the MT-RJ fiber optic connector.