| Gigabit Ethernet | 1.25 Gb/s | SFP | Up to approximately 550 m on multimode fiber; up to 80 km on selected single-mode variants | 850 nm multimode or 1310/1550 nm single-mode | Enterprise access, storage networks, and metropolitan links | Confirm switch compatibility, digital diagnostics, connector type, and required transmission distance |
| 10 Gigabit Ethernet | 10 Gb/s | SFP+ | Approximately 300 m on multimode fiber; up to 80 km on long-reach single-mode variants | 850 nm multimode or 1310/1550 nm single-mode | Data-center server links, aggregation, and enterprise backbone connections | Check SFF-8472 diagnostics support, host-port coding, power consumption, and interoperability testing |
| 25 Gigabit Ethernet | 25.78 Gb/s line rate for common Ethernet implementations | SFP28 | Approximately 70 m to 100 m on common multimode deployments; longer distances on single-mode variants | 850 nm multimode or 1310 nm single-mode | High-density server-to-switch connections and data-center leaf networks | Validate host support for SFP28, lane configuration, thermal budget, and backward compatibility with 10 Gb/s ports |
| 40 Gigabit Ethernet | 40 Gb/s using four parallel lanes | QSFP+ | Typically up to 100 m on multimode fiber; up to 10 km on common single-mode variants | 850 nm parallel optics or 1310 nm single-mode | Data-center aggregation and short-to-medium-distance interconnects | Confirm MPO polarity, lane breakout requirements, FEC behavior, and switch firmware compatibility |
| 100 Gigabit Ethernet | 100 Gb/s using four 25 Gb/s-class lanes or four optical lanes | QSFP28 | Approximately 70 m to 100 m on multimode fiber; 2 km to 10 km on common single-mode variants | 850 nm parallel optics or 1310 nm single-mode | Leaf-spine networks, cloud infrastructure, and high-capacity backbone links | Evaluate FEC mode, breakout options, optical budget, cable infrastructure, and port coding requirements |
| 200 Gigabit Ethernet | 200 Gb/s using four 50 Gb/s-class lanes | QSFP56 | Commonly up to 100 m on multimode fiber and up to 2 km on selected single-mode designs | 850 nm multimode or 1310 nm single-mode | High-performance computing, data-center spine, and accelerated workloads | Check host electrical signaling, FEC requirements, thermal dissipation, and operating-system or firmware support |
| 400 Gigabit Ethernet | 400 Gb/s using eight 50 Gb/s-class lanes or four 100 Gb/s-class lanes | QSFP-DD or OSFP | Approximately 100 m on multimode fiber; 2 km to 10 km on common single-mode variants | 850 nm parallel optics or 1310 nm single-mode | Large-scale cloud, AI clusters, data-center spine, and inter-building networks | Prioritize thermal design, lane mapping, FEC interoperability, optical power budget, and validated host platforms |
| 800 Gigabit Ethernet | 800 Gb/s using eight 100 Gb/s-class electrical or optical lanes | OSFP or QSFP-DD800 | Reach depends strongly on optical architecture; short-reach multimode and several-kilometer single-mode options are common | 850 nm multimode or 1310 nm single-mode | AI fabrics, hyperscale data centers, and ultra-high-capacity switching | Require platform qualification, power and cooling validation, FEC alignment, firmware control, and lifecycle planning |
| Direct-Attach Copper | Commonly 10 Gb/s to 800 Gb/s, depending on cable and lane design | SFP+, SFP28, QSFP28, QSFP56, QSFP-DD, or OSFP assemblies | Usually up to 3 m for passive assemblies; active assemblies can support longer distances | Twinaxial copper; no optical wavelength | Short rack-scale server and switch connections | Compare total power, bend radius, cable weight, port coding, EMI performance, and rack-distance requirements |
| Active Optical Cable | Commonly 40 Gb/s to 800 Gb/s | Fixed transceiver ends with integrated optical cable | Often 3 m to 100 m, depending on speed and fiber construction | Multimode optical fiber, commonly using 850 nm components | High-density rack-to-rack and row-to-row data-center links | Assess fixed-length limitations, connector cleanliness, field replacement process, power consumption, and cable management |