Compare Cisco 25G optical modules for SFP28 server access, leaf-spine, storage, and high-performance switching links where migration from 10G, lane efficiency, FEC behavior, and platform support matter. Review SR, CSR, LR, ER, BiDi, DAC, AOC, MMF or SMF cabling, connector type, dual-rate needs, compatibility matrix status, and exact SKU availability.
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10/25GBASE-CSR SFP28 – 850nm MMF – 300 m OM3 / 400 m OM4 – 0 to 70°C
10/25GBASE-LR SFP28 – 10 km G.652 SMF – -40 to 85°C Industrial Temperature
10/25GBASE-LR SFP28 – 10 km G.652 SMF – 0 to 70°C Commercial Temperature
25G SFP28 AOC – 10m Length – Active Optical Cable
25G SFP28 AOC – 1m Length – Active Optical Cable
25G SFP28 AOC – 2m Length – Active Optical Cable
25G SFP28 AOC – 3m Length – Active Optical Cable
25G SFP28 AOC – 4m Length – Active Optical Cable
25G SFP28 AOC – 5m Length – Active Optical Cable
25G SFP28 AOC – 7m Length – Active Optical Cable
25GBASE-ER SFP28 – 40km SMF – Industrial Temp
25GBASE-SL SFP28 – 850nm MMF – 20m OM3 / 30m OM4 Short Link
25GBASE-SR SFP28 – 850nm MMF – 100m OM4
25G SFP28 DAC – 1m Passive Copper – No FEC Required
25G SFP28 DAC – 2m Passive Copper – No FEC Required
25G SFP28 DAC – 3m Passive Copper – BASE-R FEC
25G SFP28 DAC – 4m Passive Copper – RS-FEC
25G SFP28 DAC – 5m Passive Copper – RS-FEC
Cisco 25G Optical Modules are used for 25 Gigabit Ethernet links in data center, server access, leaf-spine, and high-performance campus or aggregation environments. They provide more bandwidth than 10G while using SFP28 ports on supported Cisco platforms.
Choose by matching the SFP28 port, required reach, fiber type, connector, FEC requirement, platform compatibility, and exact Cisco part number. The right 25G optic depends on both the link design and the switch or adapter support matrix.
SR and CSR are commonly used for multimode fiber at shorter distances, while LR and ER are used for longer single-mode fiber links. Confirm fiber plant, distance, optical budget, and platform support before selecting the module.
Some Cisco 25G modules or dual-rate 10/25G optics can support 10G operation, but support depends on the exact transceiver, port, and software release. Verify dual-rate support before planning mixed 10G and 25G links.
FEC, or Forward Error Correction, helps maintain reliable high-speed links by correcting errors. Some 25G optics and platforms require specific FEC behavior, so mismatched settings can prevent links from coming up or cause instability.
Choose DAC for short rack-level copper runs, AOC for short active optical links, and optical transceivers for structured fiber or longer distances. The best option depends on cable distance, pathway, power, cost, and supported Cisco ports.
No. A Cisco 25G optic must be supported by the specific platform, port, and software release. Check the Cisco transceiver compatibility matrix before assuming any SFP28 module will work.
The required fiber depends on the optic type. Short-reach 25G optics commonly use multimode fiber, while longer-reach modules use single-mode fiber. Confirm connector type, fiber grade, distance, and patching before purchase.
Compatibility issues often come from unsupported transceivers, wrong software release, FEC mismatch, incorrect fiber type, dirty connectors, excessive link loss, or unsupported dual-rate operation. Always validate the exact optic and platform together.
Verify exact SKU, SFP28 support, reach, wavelength, fiber type, connector, FEC behavior, dual-rate needs, platform compatibility, software release, condition, warranty, and lead time before ordering Cisco 25G optics.
Cisco 25G Optical Modules are often the right choice when a network needs more bandwidth than 10G but does not need to move all the way to 100G. They are widely used for server connectivity, switch uplinks, data center access, and high-density 25G deployments where SFP28 optics offer a practical balance of speed, cost, and port efficiency. This category is built for buyers who need to source compatible Cisco 25G transceivers, compare options for different link distances and fiber types, and request pricing, availability, and lead time for active projects. Cisco’s 25G portfolio is centered on SFP28-based connectivity and is positioned for next-generation 25 Gigabit Ethernet applications. [oai_citation:2‡Cisco](https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-736950.html?utm_source=chatgpt.com)