Gigabit Ethernet (1000BASE SFP) Defined
So what is 1000BASE SFP? In our world of computer networking, Gigabit Ethernet (1000BASE SFP) is the combination of various technologies specifically for transmitting Ethernet frames at a set rate of 1 gigabit each second (1,000,000,000 bits per second), as explicitly defined by the IEEE 802.3-2008 standard. At the beginning of 1999, it gradually replaced Fast Ethernet amongst wired local network environments. The supporting hardware such as cables and other equipment are much similar to preceding standards and has been much adopted since 2010.
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1000BASE SFP SX Defined
The 1000BASE SFP SX is an established standard for an optical fiber Gigabit Ethernet for operation over multi-mode fiber using a 770 to 860 nanometer, with near infrared (NIR) light wavelength.
The internationally-accepted standard stipulates a maximum length of 220 meters for 62.5 µm/160 MHz×km multi-mode fiber, 275 meters for 62.5 µm/200 MHz×km, 500 meters for 50 µm/400MHz×km, and 550 meters for 50 µm/500 MHz×km multi-mode fiber. For most practical situations and purposes, with high quality fiber, optics, and terminations, the 1000BASE-SX will usually work over significantly greater distances.
Also, the standard is highly-adopted for intra-building links in large office buildings, co-location facilities and carrier-neutral Internet exchanges, as well as other settings.
The optical power specifications of SX interface: Minimum output power at −9.5 dBm. Minimum receive sensitivity at −17 dBm.
1000BASE SFP LX Defined
The 1000BASE SFP LX utilizes a long wavelength laser (1,270–1,355 nm), with a maximum RMS spectral width of 4 nm, and an optical fiber Gigabit Ethernet standard specified in IEEE 802.3 Clause 38. Also, 1000BASE-LX is specified to work properly over distances of up to 5 km over 10 µm single-mode fiber.
In addition, the 1000BASE-LX can also run over all common types of multi-mode fiber with a maximum segment length of 550 meters. The use of a special launch conditioning patch cord may be needed in situations with link distances greater than 300 meters. This set up will launch the laser at a precise offset from the center of the fiber, which causes it to spread across the diameter of the fiber core, reducing an effect known as differential mode delay, which occurs when the laser couples onto only a small number of available modes in multi-mode fiber.