These SFP transceivers are for connecting an UTP copper cable (Cat-5/6, etc) to a SFP slot. This is an unusual usage because normally SFP slots are used for fiber optic cables and most network equipment will have an abundance of copper (RJ45) ports. But if your network equipment does not have an available copper port, this provides an option for one more copper connection.
Speed:      1000Mbps (data transfer rate 1.25Gb/s)
Fiber type:      UTP copper cable, Cat-5/6, etc.
Link Budget:      n/a
Extraction Lever:      none
Power Requirement:      +3.1 to 5.5vdc
Size:      2.2in x 0.54in x 0.34in (56.5mm x 13.7mm x 8.6mm)
Operating temperature:      0ºC to 70ºC (32ºF to XXXºF)
Standards:      1000Base-T, GBIC Rev5.5, ANSI X3TII, RoHS compliant