SFP-25G-SR-S is a Cisco 25-Gigabit Ethernet SFP28 transceiver designed for short-reach, high-speed fiber links. It’s a 25GBase-SR optic that runs over multimode fiber, commonly used for server, storage, and switch interconnects in modern data center and campus environments.
Why buyers pick SFP-25G-SR-S (plain English)
High-speed server connectivity Delivers 25GbE bandwidth for modern compute and storage workloads.
Short-reach fiber standard Ideal for data centers and wiring closets where distances are limited.
SFP28 form factor Compact and hot-swappable, enabling high port density and easy upgrades.
Cisco-qualified optics Designed and tested for compatibility with Cisco 25G platforms.
Cost-effective at short distances Lower cost than long-reach optics when fiber runs are short.
60-second spec box (SFP-25G-SR-S)
Form factor SFP28
Speed 25GbE (25GBase-SR)
Fiber type Multimode fiber (OM3 / OM4)
Wavelength 850 nm
Connector LC duplex
Max distance Up to ~70 m (OM3) Up to ~100 m (OM4)
Use case 25GbE short-reach server, storage, and switch interconnects.
Where it fits (and when to choose something else)
Perfect for:
Data center server uplinks
Leaf-spine architectures
High-density 25GbE switch ports
Short-distance fiber links
Choose something else if:
You need longer distances → 25GBase-LR
You’re using single-mode fiber → LR optics
You only need 10GbE → SFP+ optics
TL;DR
SFP-25G-SR-S is Cisco’s 25GBase-SR SFP28 optic: a short-reach multimode fiber transceiver delivering high-speed 25GbE for modern networks.
Key specifications
Feature
Specification
Source
Form Factor
SFP28 (hot-swappable)
Data Rate
25 Gbps
Interface
25GBASE-SR
Media Type
Multimode Fiber (MMF)
Connector
Duplex LC
Wavelength
850 nm
Maximum Distance
100m over OM4 MMF, 70m over OM3 MMF
Operating Temperature
0°C to 70°C (32°F to 158°F)
Power Consumption
< 1.2 Watts
Features
Digital Optical Monitoring (DOM) support, requires Forward Error Correction (FEC) on host ports
Features and use cases
High Performance:Delivers high bandwidth for demanding applications within data centers, including server-to-switch and switch-to-switch connections.
Cost-Effective:Often used as a cost-effective alternative to 40G or 100G links for short-reach applications.
Enhanced Monitoring:Digital Optical Monitoring (DOM) provides real-time information on operating parameters, aiding in network management and troubleshooting.
Standard Compliance:The transceiver is compliant with Multi-Source Agreement (MSA) and IEEE standards, ensuring interoperability.
