TP-Link's TL-SM321A adopts the latest standard 1000 Base-BX, transmission over a single strand of fiber, with one different wavelength going in each direction. You can extend the network distance up to 10 Km with TP-Link's routers, switches, media converters to provide high speed & stability. Please note: networking components such as switches, routers, UPS & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.