buy MonoMode SFP Fibre Module TP-Link TL-SM321B 10 km 1.25 Gbps . Range: 10 km20 kmSpeed: 1.25 GbpsWavelength: 1550nm Tx/1310nm RxPower supply: Electric NetworkVoltage: 3,3VType: 9/125 μmMonoMode SFP Fibre ModuleFibre opticConnections: SFPProduct with plug: YesType of plug: Plug EUColour: SilverAC input voltage: 3.3 V Spotlight:- WDM Bi-Directional SFP Module- Supports WDM Bi-Directional technology, using a single strand of fiber, cost savingTP-LINK´s TL-SM321B adopts the latest standard 1000Base-BX, transmission over a single strand of fiber, with one different wavelength going in each direction. You can extend the network distance up to 10Km with TP-LINK´s Routers, Switches, Media Converters to provide high speed and stability.Features- Supports WDM Bi-Directional technology, using a single strand of fiber- TX: 1310nm / RX: 1550nm- Internal +3.3V Power Supply- In pairs with TL-SM321A- Plug-and-Play- Suitable: MC220L, TL-R4199G/4299G, TL-SG3109, TL-SL3428/3452, TL-SG2109WEB/2216WEB/2224WEB, TL-SL2210WEB/2218WEB/2428WEB/2452WEB, TL-SL1351 and the other equivalent devices SFP transceiver type: Fiber opticMaximum data transfer rate: 1250 Mbit/sInterface type: SFPSingle-mode fiber (SMF) supported: YFiber cable diameters supported (core/cladding): 9/125 µmMaximum transfer distance: 10000 mTx wavelength (max): 1550 nmRx wavelength (max): 1310 nmNetworking standards: IEEE 802.3zPlug and Play: YCertification: FCC, CEInput voltage: 3.3 VOperating temperature (T-T): 0 - 70 °CStorage temperature (T-T): -40 - 80 °COperating relative humidity (H-H): 10 - 90%Storage relative humidity (H-H): 5 - 90%Width: 55.4 mmDepth: 12.9 mmHeight: 12.9 mmPackage width: 122.5 mmPackage depth: 81.5 mmPackage height: 38.5 mmPackage weight: 60 g