Model:EW-SFP-GFE 1000M , Accessory SFP-T-AUTO Copper SFP Transceiver (EW-SFP-GFE) Model:EW-SFP-GE-T1310 EW-SFP-GE-R1550 1000M , Accessory 1.25G Single-mode Single Fiber SFP Module 1310/1550nm 20KM(EW-SFP-GE-T1310 EW-SFP-GE-R1550) Model:EW-SFP-GE-SD1310 1000M , Accessory 1.25G Single-mode Dual Fiber SFP Module 1310nm 20KM(EW-SFP-GE-SD1310) Model:EW-SFP-GE-MD850 1000M , Accessory 1.25G Multi-mode Dual Fiber SFP Module 850nm 500meter(EW-SFP-GE-MD850)