StarTech.com Cisco SFP-25G-LR-S Compatible SFP28 Module, 25Gb Single Mode Fiber (SMF), 25GBASE-LR LC Transceiver, 10km (6.2mi), DDM/DOM

Experience seamless 25 Gbps connectivity with this StarTech.com SFP28 transceiver, a direct equivalent to Cisco’s SFP-25G-LR-S. Engineered for long-haul links, it delivers reliable, high-performance performance over single-mode fiber (SMF) up to 10 kilometers, making it an ideal choice for data centers, enterprise backbones, and campus networks. This module is designed for easy integration with Cisco switches and routers, backed by thorough testing and a proven compatibility matrix to ensure smooth operation in complex IT environments.

Whether you’re refreshing an aging 10 Gigabit fabric or building a new 25G core, this SFP28 transceiver provides the flexibility and confidence you need. It supports Digital Diagnostics Monitoring (DDM/DOM) for real-time visibility into link health, assistive fault finding, and proactive maintenance. With an LC duplex connector and 1310 nm optical wavelength, you’ll enjoy clear, dependable performance across long distances—without the vendor lock-in or price premium associated with brand-name modules.

• Direct equivalent to Cisco SFP-25G-LR-S, enabling seamless compatibility with Cisco switches and routers while preserving vendor-validated performance.
• Long-range 25 Gbps connectivity over single-mode fiber (SMF) up to 10 km, perfect for data center interconnects, campus backbones, and remote offices.
• Digital Diagnostics Monitoring (DDM/DOM) support provides real-time insight into transmitter power, receiver strength, temperature, and optical health for proactive maintenance and faster troubleshooting.
• MSA-compliant SFP28 form factor with LC duplex connector, ensuring broad interoperability across a wide range of switches, routers, and storage networks that support SFP28 transceivers.
• Plug-and-play reliability with tested Cisco compatibility, lightweight design for easy hot-swapping, and optimized power usage to help reduce total cost of ownership in 24/7 data-center environments.

Technical Details of StarTech.com Cisco SFP-25G-LR-S Compatible SFP28 Module

• Form factor: SFP28 transceiver (hot-swappable)
• Data rate: 25 Gbps
• Wavelength: 1310 nm (typical)
• Fiber type: Single-Mode Fiber (SMF)
• Reach: Up to 10 km (6.2 miles)
• Connector: LC duplex
• Optical monitoring: Digital Diagnostics Monitoring (DDM/DOM)
• Standards: 25GBASE-LR; compatible with Cisco SFP-25G-LR-S and other SFP28-enabled devices
• Power and temperature specifications: Designed to meet standard SFP28 operating requirements with efficient power usage and reliable performance in typical data-center environments
• Compatibility notes: Programmed and tested for seamless integration with Cisco switches and routers to ensure straightforward operation in mixed-vendor deployments

how to install StarTech.com Cisco SFP-25G-LR-S Compatible SFP28 Module

Installing this SFP28 transceiver is straightforward and designed to minimize downtime. Follow these best-practice steps to ensure a secure, reliable connection:

1) Power considerations: While SFP28 modules are generally hot-swappable, confirm your device supports hot-swapping and follow your vendor’s guidelines for insertion. If needed, power down the host device or place it in a maintenance mode according to your network policy.

2) Prepare the fiber: Use a clean, LC-terminated single-mode fiber run with the correct connector types. Inspect fiber ends for cleanliness and remove any dust or debris that could impact signal integrity.

3) Insert the transceiver: Align the module with the SFP28 slot on the switch or router and gently insert until it seats with a secure click. Do not force the module; ensure the latching mechanism is engaged for proper retention.

4) Connect the fiber: Attach the LC duplex fiber to the module’s connectors, ensuring proper polarity. Avoid bending the fiber beyond its minimum bend radius and keep runs as direct as possible to maintain signal quality.

5) Verify operation: Power on the device (if required) and check the interface status via the management plane or CLI. Confirm that the transceiver is recognized, the link is up, and the 25G interface shows expected speed. Use the included DOM data to monitor link health and performance over time.

6) Troubleshooting: If the link does not come up, recheck fiber cleanliness, verify correct OM1/OM2/SMF type, ensure compatible firmware versions, and consult the device’s interface logs for any transceiver-related errors. The presence of DDM/DOM information can help pinpoint optical or power-related issues quickly.

Frequently asked questions

• Is this module compatible with Cisco SFP-25G-LR-S? Yes. It is designed as a direct equivalent and has been tested to ensure seamless integration with Cisco switches and routers that support SFP28 transceivers.
• What distance can I reliably run with this transceiver? The module supports up to 10 km on single-mode fiber with LC connectors, making it suitable for data-center interconnects and long-haul links between campuses.
• Does the module support Digital Diagnostics Monitoring (DDM/DOM)? Yes. DDM/DOM is included, giving you real-time visibility into optical power, temperature, and receiver metrics for proactive network management.
• What are the compatibility expectations with non-Cisco devices? As an MSA-compliant SFP28 transceiver, it should work with other vendors’ equipment that accepts SFP28 LR transceivers, though full interoperability is best verified in advance with your hardware and firmware versions.
• Is installation hot-swappable? In most environments, SFP28 transceivers are hot-swappable. However, always follow your equipment vendor’s guidelines and perform routine safety checks when swapping components in a live network.
• What kind of optimization does this provide for a 25G switch port? It delivers high-density, low-latency 25 Gbps connectivity over SMF with long reach, enabling efficient scaling of data-center workloads, high-performance compute clusters, and storage networks while maintaining compatibility with Cisco ecosystems.