Cisco SFP-25G-SR-S-I Compatible SFP28 25GBASE-SR 850nm 100m DOM Duplex LC/UPC MMF Optical Transceiver Module (Industrial)

Overview

This is a high-performance, industrial-grade SFP28 transceiver designed for 100% compatibility with the Cisco SFP-25G-SR-S-I. It is engineered with ruggedized components to provide reliable 25 Gigabit Ethernet connectivity in harsh environmental conditions, supporting a wide operating temperature range of -40°C to 85°C (-40°F to 185°F).

As an S-Class optic, this module is optimized for enterprise and data center 25G Ethernet applications. It adheres to the 25GBASE-SR standard, utilizing a cost-effective 850nm VCSEL laser to transmit data over multi-mode fiber (MMF). It can achieve a link distance of up to 70 meters on OM3 MMF or up to 100 meters on OM4 MMF, making it an ideal solution for short-range, high-speed interconnects in demanding settings like factory floors, outdoor cabinets, and campus backbones.

Key Features

• Guaranteed 100% compatible with Cisco platforms that require the SFP-25G-SR-S-I module.
• Industrial Grade: Hardened for a wide operating temperature range from -40°C to 85°C.
• S-Class Optic: Optimized for standard reach 25G Ethernet applications.
• Compliant with the 25GBASE-SR standard at 25.78 Gbps.
• Transmits up to 70m over OM3 MMF and 100m over OM4 MMF.
• Utilizes a high-reliability 850nm VCSEL transmitter.
• Features a standard Duplex LC connector.
• Hot-pluggable SFP28 MSA-compliant form factor.
• Integrated Digital Optical Monitoring (DOM/DDM) for real-time diagnostics.
• Low power consumption for efficient operation.

Applications

The SFP-25G-SR-S-I compatible module is purpose-built for high-bandwidth connections in challenging industrial environments:

• 25G Ethernet uplinks for industrial switches and routers.
• High-speed server-to-switch connections in non-climate-controlled data closets.
• Inter-switch links in factory automation and intelligent transportation systems (ITS).
• Campus and enterprise backbone links exposed to extreme temperatures.
• Short-reach, high-density 25G connectivity for industrial data aggregation.

Specifications

Cross-Platform Compatibility

Programmed for seamless integration with Cisco industrial equipment, this SFP28 module’s adherence to the SFP28 MSA standard also ensures its functionality in a wide array of networking hardware from other vendors that support industrial 25GBASE-SR optics.

Advantages

This industrial transceiver delivers robust 25G performance where commercial-grade modules would fail. It provides a cost-effective alternative to OEM optics without sacrificing quality or reliability, enabling the deployment of high-speed, temperature-resilient networks within a conservative budget.

FAQ (Technical & Product Questions)

1. What does “S-Class” mean for this SFP-25G-SR-S-I module?

“S-Class” designates that this optic is optimized for standard Enterprise and Data Center Ethernet applications. It supports the 25GBASE-SR specification but is not designed for more specialized protocols like Fibre Channel over Ethernet (FCoE) or CPRI. It is the most common and cost-effective type for standard 25G links.

2. What is the difference between an SFP+ and an SFP28 module?

SFP+ and SFP28 modules share the same physical form factor, meaning an SFP28 module can fit into an SFP+ port. However, SFP28 is designed for 25 Gbps per lane, while SFP+ is designed for 10 Gbps. You must use an SFP28 module in an SFP28 port to achieve 25G speeds.

3. What type of fiber cable is needed to achieve the full 100m distance?

To reach the maximum distance of 100 meters, you must use laser-optimized OM4 multi-mode fiber (MMF) patch cables, which typically have an aqua-colored jacket. If using older OM3 MMF (also aqua), the maximum reach is limited to 70 meters.

4. Can I use this industrial module in a commercial-grade switch?

Yes. An industrial module is built to a higher durability standard and will function perfectly within the limited temperature range of a commercial environment (e.g., a climate-controlled data center).

5. Will this 25G module work at lower speeds, like 10G?

This depends on the host device (the switch or NIC). Many SFP28 ports are backward compatible and can auto-negotiate to 10G speeds when a 10G module is inserted. While this 25G module is designed for 25G, some host devices may allow it to link at 10G, but this capability is not guaranteed by the module itself. It’s best to check the host device’s specifications.

6. Is this module compatible with OM1 or OM2 fiber?

No. The 25GBASE-SR standard requires higher-grade, laser-optimized multi-mode fiber (OM3 or OM4) to support the high data rate. Using it with older OM1 (orange jacket) or OM2 (orange jacket) fiber will result in extremely short link distances or a complete failure to establish a link.