Add-On Computer Peripherals (ACP) 1000BASE-DWDM SMF SFP 40km, Cisco. Interface type: SFP, Data transfer rate (max): 1000 Mbit/s. Width: 13.7 mm, Depth: 56.6 mm, Height: 12.8 mm. Certification: IEC 60825-1, IEC 60825-2