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Fast Ethernet
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===100BASE-EX=== 100BASE-EX is very similar to 100BASE-LX10 but achieves longer distances up to 40 km over a pair of single-mode fibers due to higher quality optics than a LX10, running on 1310 nm wavelength lasers. 100BASE-EX is not a formal standard but industry-accepted term.<ref name="FS-GLC-FE-100EX">{{cite web |title=GLC-FE-100EX 100BASE-EX SFP (mini-GBIC) Transceiver |url=https://www.fs.com/de-en/products/12678.html |website=FS.com |access-date=21 March 2020 |language=en}}</ref> It is sometimes referred to as 100BASE-LH (long haul), and is easily confused with 100BASE-LX10 or 100BASE-ZX because the use of -LX(10), -LH, -EX, and -ZX is ambiguous between vendors.
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