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With relatively low interface prices, with being faster than OC-3 and OC-12 connections, and even surpassing gigabit Ethernet, OC-48 connections are used [when?] as the backbones of many regional ISPs. Interconnections between large ISPs for purposes of peering or transit are quite common.
Ethernet over fiber is a networking technology that delivers Ethernet bandwidth ranging up to 400 Gbit/s using optical fiber lines. Such wired transmission methods extend connectivity over long distances up to 200 km, support higher bitrates and provide far greater immunity from electromagnetic interference (EMI) than electrical connections.
1000BASE-SX is an optical fiber Gigabit Ethernet standard for operation over multi-mode fiber using a 770 to 860 nanometer, near infrared (NIR) light wavelength. The standard specifies a maximum length of 220 meters for 62.5 μm/160 MHz×km multi-mode fiber , 275 m for 62.5 μm/200 MHz×km, 500 m for 50 μm/400 MHz×km, and 550 m for 50 μm/500 ...
It offers the advantages of low power, low cost and low latency, but has a bigger form factor and more bulky cables than the newer single-lane SFP+ standard, and a much shorter reach than fiber or 10GBASE-T. This cable is fairly rigid and considerably more costly than Category 5/6 UTP or fiber.
The letter following the dash (T or F) refers to the physical medium that carries the signal (twisted pair or fiber, respectively), while the last character (X, 4, etc.) refers to the line code method used. Fast Ethernet is sometimes referred to as 100BASE-X, where X is a placeholder for the FX and TX variants. [4]
On devices like modems, bytes may be more than 8 bits long because they may be individually padded out with additional start and stop bits; the figures below will reflect this. Where channels use line codes (such as Ethernet , Serial ATA , and PCI Express ), quoted rates are for the decoded signal.