The SFP28 Active Optical Cable is a direct-attach fiber with SFP28 connectors and operates over Multi-Mode Fiber (MMF). This AOC is compliant with the SFF-8432 SFP28 MSA standards. The 25G Modules are based on SFP28 form factor. It provides a cost-efficient solution as compared to using discrete optical transceivers and optical patch cables and. Siemon 25G SFP28 Active Optical Cable (AOC) assemblies offer a highly reliable and cost-effective alternative to transceiver assemblies available in lengths ranging from 0. 5 m to 100 m, beyond the range of Direct Attach Copper Cables (DAC).