Note: Only one converter is sold. Photo is showing front and rear of the unit for a better understanding of the DC48V power input. Product description FMC-10-100-SC20B-DC48 is a single strand WDM, Bi-Directional fiber media converter with Tx:1550nm/Rx:1310nm, operating on a 20Km distance, with auto-negotiation 10/100 and MDI/MDI-X features for the Fast Ethernet RJ45 UTP interface. The A ending model must always be matched with a complementary B type converter for proper operation.Even without the SNMP management support, FMC series support Link-Fault-Pass through function (LFP - an extremely useful feature to easily debug faulty fiber links), Far-End-Fault function (FEF), acts on a Store-and-Forward switching platform and can carry Jumbo data packets up to 9K size. The FMC-10-100-SC20B-DC48 is a standalone unit that has embedded DC 36-72V input power supply. Technical specifications Interfaces: RJ45 copper IEEE 802.3 10Base-T, 802.3u 100Base-TX compliant and SC, 100Base-FX compliant Operating wavelength: Tx:1550nm / Rx:1310nm single strand BiDirectional Ethernet interface: Supports 10/100Base-T/TX, Full, Half duplex n-way (Auto-Negotiation).Supports Full, Half duplex, 10/100 speed manual selections.Transmission Packet Rate for 10/100Base-T/TX : 14880 per second/148800 per second.Copper TP cable 4 pair Cat. 3 or 5 UTP Features: FEF (Far-End-Fault) and LFP (Link-Fault-Pass through) Operating distance: 20Km on 9/125um fiber Optical connector: single SC type(ST or FC available on demand) Front LEDs: PWR, LLF, Fiber Link, TP Link, Duplex, Speed Power: embedded DC48V power supply, 3 pin block connector Temperature: 0~50°C (Operating); 0~70°C (Storage) Humidity: 20-80% non condensing (Operating); 0-90% (Storage) Consumption: less than 4W Dimensions(WxDxH): 73mm x 108mm x 23mm Weight: 160g (without AC adapter) Compliance: FCC part 15, Subpart B, Class A,ANSI C63.4:2003CE EN55022:2006, Class AEN55024:1998+A1:2001+A2:2003LVD: EN 60 950-1:2001 MTBF: 65,000 hours