Physical Layer The current 1-Gbps specification for IEEE 802.3 includes the following physical layer alternatives (Figure 16.5):• 1000BASE-SX: This short-wavelength option supports duplex links of up to275 m using multimode or up to 550 m using multimode fiber.Wavelengths are in the range of 770 to 860 nm.• 1000BASE-LX: This long-wavelength option supports duplex links of up to550 m of or multimode fiber or 5 km of single-modefiber. Wavelengths are in the range of 1270 to 1355 nm.
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