1000BaseSX (“S” for short wavelength) defines optical trans-ceivers or Physical Layer devices for laser fiber cabling. The wavelength of SX lasers is 770 to 860 nanometers (nm), and is commonly referred to as 850 nm. 1000BaseSX is based on the Fibre Channel physical signaling specification. Targeted for multimode fiber only, 1000BaseSX transceivers are less costly than those found in products implementing the long wave-length specification such as the 1000BaseLX (long wavelength) specification.