D-Link DMC 920

D-Link DMC 920 ... avoids the budget losses incurred by the single-wavelength single-fiber technology, and minimizes the possibility of reflections in the system. The units on both ends of a link are different. One module uses one wavelength to transmit and a second wavelength to receive, while the other module flips that relationship. For this reason these units are used in pairs. A pair of one-channel single fiber is used for media conversion between 10/100BASE-TX and 100BASE-FX. Two different transmitting wavelengths, one wavelength with bi-directional for both transmit and receive.