The IEEE 802.3z standard includes 1000BASE-SX for transmission over multi-mode fiber, 1000BASE-LX for transmission over single-mode fiber, 100BASE-FX is a version of Fast Ethernet over optical fiber. It uses a 1300 nm near-infrared (NIR) light wavelength transmitted via two strands of optical fiber, one for receive(RX) and the other for transmit(TX), 100BASE-SX is a version of Fast Ethernet over optical fiber. It uses two strands of multi-mode optical fiber for receive and transmit. Primus IT offers the whole series of FE and GE optical fiber transceivers. Including: SFP-SX MMF 550M、SFP-LX SMF 10-20KM、SFP-EX SMF 40KM、SFP-ZX SMF 80KM、SFP-EZX SMF 100KM SFP-CWDM、SFP-DWDM、SFP-BIDI.