The optional, space age FiberTEK FDX provides the fastest and only dual wavelength, bidirectional fiber certification available Innovative FiberTEK FDX modules allow complete testing of each fiber strand without ever having to swap transmit and receive ports to get full dual wavelength, bidirectional results Field changeable SC, ST and FC adapters eliminate the need for hybrid launch cables Full-duplex optics simplify certification and offer the fastest test times ever Available in multimode LED, multimode VCSEL/Laser (1/10/40 Gig) and single mode laser configuration