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The SFP28 direct-attach cables are available to provide the following types of connections: Single-connection cables provide a 25 Gb bidirectional copper or optical connection between unpopulated SFP28 ports. These cables are available in lengths from 1 meter to 20 meters and are terminated in connectors that are inserted directly into the SFP., SFP+, or SFP28 cages in place of optical modules. We recommend enabling Forward Error Correction (FEC) when you use 25 Gb SFP28 direct-attach cables.