FX UHD Frame OS2 18 Ports. DCX adapter frames and cassettes can be assembled using a variety of sizes such as two (Base-24), four (Base-12), or six (Base-8) cassettes per housing tray. They are compatible with the DCX housings. The FiberExpress Ultra High-Density (FX UHD) Cassettes and Frames support up to 72 LC Duplex or MPO ports per 19” rack unit. FiberExpress Ultra (FX Ultra) provides a medium density solution for data center cross-connects. The Cassette family includes Pre-terminated, Splice, Splitter, TAP and Optimizer Cassettes. The Frames family covers all connector types including MPO Type A, LC Duplex, SC Duplex, SC Simplex, ST and Copper RJ45 Jacks and Couplers.