Cisco SFP-10/25G-LR-S Compatible 10/25GBASE-LR SFP28 Optical Transceiver Module for Data Center (SMF, 1310nm, 10km, DOM)
The Cisco SFP-10/25G-LR-S compatible SFP28 transceiver provides 10/25GBASE-LR throughput up to 10km over single mode fibre (SMF) using a wavelength of 1310nm via an LC duplex connector. This module provides 10G backward compatibility and simplifies network upgrade. It provides connectivity option for 25G Ethernet, 10G Ethernet and data centre. It is fully compliant with the SFP28 MSA, SFF-8472, SFF-8402, SFF-8432 and applicable portions of SFF-8431 standard.
Note: The FS P/N is changed from SFP-10/25GLR-31 to SFP-25GMLR-31, but the product is the same. Only the FS P/N has been changed.
- Leaf-spine Connections: Use the same type of optical modules as the original network to expand the data centre, avoiding the addition of new module types and saving on network maintenance costs.
- Upgrade Your Network One Site at a Time: Upgrade just one site to 100G gear, and still connect it to the existing 25G sites.
- 25G Connectivity for Data Center: Featured with low-power, high-density and high-speed, the SFP28 transceiver offers a popular way to help you quickly ramp up to 25G transmission
- Leading Performance and Quality for 25G: Built-in Macom Chip, the SFP28 25G transceiver offers high-speed, and low-power in 25G links. Equipped with individually designed BOX packaging.
Cisco 25G Modules provide these highlights:
•Interoperable with other IEEE-compliant 25G interfaces where applicable
•Certified and tested on Cisco SFP28 ports for superior performance, quality, and reliability
•High-speed connectivity compliant to IEEE 802.3by and IEEE 802.3cc
Important Notes & Use‑Case Considerations
- RS‑FEC Required for 25G over full distance: To reach the full 10 km at 25 Gbps, host equipment must support RS‑FEC. Without FEC, reach may drop or the link may not come up.
- Engineered Links: If insertion loss is kept low (e.g. good quality fiber + connectors, minimal splices), it’s possible to push a bit beyond 10 km (≈ 15 km). But only under good conditions & with FEC.
- Backward Compatibility: Works with 10G mode. Useful if upgrading infrastructure gradually.
- Industrial vs Commercial Temperature Versions: If you’re deploying in harsher environments (outside data centers, non‑climate‑controlled, etc.), the industrial temp variant (“‑I”) is better.
Warranty
Cisco’s “Limited 5‑Year Hardware Optical Warranty” (WARR‑5YRHW‑OPTICAL) confirms that for optical hardware (which includes these transceiver modules), the warranty duration is 5 years from date of shipment.






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