FTTx Compact Junction Box, Connection: 2x SC-Simplex/LC-Duplex The FTTX Compact Junction Box includes a hinged fiber overlength cassette to facilitate cable entry or termination. The splice protector receptacle is included in the fiber overlength cassette. There are knockouts for two cable entries in the box, as well as knockouts for two flangeless SC simplex or LC duplex couplings.