SFP28-25G-SR-MLNX Dell Mellanox 25GbE Transceiver Module, 850nm SR

Dell SFP28-25G-SR-MLNX Mellanox 25GbE Transceiver Module 

The 25G SFP28 fiber optic transceiver module Dell SFP28-25G-SR-MLNX is a high-performance networking solution designed for modern data centers, enterprise switching environments, and high-speed storage networks. Engineered for reliability and efficiency, this optical module supports 25 Gigabit Ethernet connectivity over multimode fiber with a reach of up to 100 meters.

General Information

• Part Number: SFP28-25G-SR-MLNX
• Device Type: Networking Transceiver Module
• Manufacturer: Dell

Technical Specifications

• Wavelength: 850nm VCSEL
• Optical Type: Short Range (SR)
• Connector Type: LC Duplex

Data Transfer Capabilities

• Data Rate: 25 Gbps (25GbE)
• Interface Type: SFP28 standard
• Signal Integrity: Low latency and high stability

Distance and Network Reach

• Maximum Transmission Distance: 100 meters
• Fiber Type: Multi-Mode Fiber (MMF)

Energy Efficient and Reliable Operation

• Low power consumption design
• Stable thermal performance under heavy workloads
• Enterprise-grade reliability for continuous uptime

Use Case Scenarios

• Enterprise data center switching
• Cloud infrastructure networking
• High-frequency trading networks
• Storage area networks (SAN)
• High-bandwidth server interconnects

Scalability and Future-Ready Design

• Supports next-generation Ethernet scaling
• Backward compatible with existing SFP28 ports
• Ideal for upgrade paths from 10GbE networks

Technical Snapshot

• Speed: 25Gbps Ethernet
• Form Factor: SFP28
• Distance: 100m over MMF
• Wavelength: 850nm
• Connector: LC Duplex

Dell SFP28-25G-SR-MLNX Mellanox 25GbE Transceiver Module 

The Dell SFP28-25G-SR-MLNX Mellanox 25GbE SFP28 Transceiver Module 850nm SR 100m Optical LC is a high-performance optical networking component engineered for next-generation data center environments requiring ultra-low latency, high bandwidth density, and energy-efficient short-reach fiber connectivity. Designed for 25 Gigabit Ethernet (25GbE) applications, this SFP28 SR module operates over multimode fiber and is optimized for scalable leaf-spine architectures commonly deployed in modern enterprise networks, cloud computing infrastructures, and high-performance computing clusters.

This transceiver module integrates Mellanox optical engineering expertise with Dell networking ecosystem compatibility, ensuring reliable interoperability across supported switching and server platforms. It provides a balanced combination of performance stability, thermal efficiency, and compact form factor design, making it a preferred choice for high-density switch environments where port utilization and throughput optimization are critical.

Advanced 25GbE SFP28 Optical Technology Architecture

850nm Vertical-Cavity Surface-Emitting Laser (VCSEL) Design

The module utilizes an 850nm VCSEL-based optical transmission system, which is optimized for short-range multimode fiber links. The 850nm wavelength is widely adopted in data center interconnects due to its cost efficiency, low power consumption, and compatibility with OM3 and OM4 fiber types. The optical transmitter ensures stable signal propagation over distances up to 100 meters depending on fiber grade, enabling efficient intra-data center communication.

High-Speed Signal Modulation Efficiency

The SFP28 architecture incorporates advanced signal modulation techniques that support 25.78Gbps line rates. This ensures efficient packet transmission for latency-sensitive workloads such as virtualization clusters, financial trading systems, and real-time analytics platforms. The module is engineered to maintain signal integrity even under dense switch fabric conditions.

Integrated Digital Diagnostic Monitoring (DDM)

Built-in DDM functionality enables real-time monitoring of optical parameters such as transmit power, receive power, temperature, and laser bias current. This ensures proactive network management and reduces downtime risks by allowing administrators to detect performance degradation early.

High-Performance Data Center Connectivity Capabilities

Optimized for 25GbE Leaf-Spine Architectures

The Dell SFP28-25G-SR-MLNX module is specifically designed to support modern leaf-spine network topologies, where high bandwidth aggregation and non-blocking performance are essential. Its low-latency characteristics make it ideal for distributed computing environments requiring consistent throughput between servers and switching layers.

Scalable Bandwidth Aggregation

This transceiver enables efficient bandwidth scaling by allowing multiple 25GbE links to be aggregated into higher throughput uplinks. It supports network expansion without requiring significant infrastructure redesign, making it a cost-effective solution for growing data centers.

Low Latency Packet Transmission

The optical interface ensures extremely low propagation delay, which is essential for workloads such as cloud orchestration, containerized microservices, and distributed database synchronization. The module reduces buffering requirements and enhances real-time data processing performance.

Compatibility and Ecosystem Integration

Dell Networking Platform Compatibility

This Mellanox-designed SFP28 module is compatible with a wide range of Dell networking switches and servers that support 25GbE optical interfaces. It is commonly deployed in enterprise-grade Dell EMC switching platforms used in modern virtualized infrastructures.

Interoperability with Mellanox-Based Systems

Due to its Mellanox engineering foundation, the module also supports interoperability with Mellanox Spectrum-based switching environments. This ensures seamless integration across hybrid network infrastructures combining Dell and Mellanox hardware ecosystems.

Standards-Based Compliance

The transceiver adheres to IEEE 802.3by and 802.3cc standards for 25GbE transmission, ensuring broad compatibility across industry-standard networking equipment. This compliance guarantees predictable performance and reliable integration in heterogeneous network deployments.

Optical Fiber Requirements and Transmission Medium

Multimode Fiber Compatibility

The module is designed for use with OM3 and OM4 multimode fiber cables equipped with LC duplex connectors. These fiber types provide the required bandwidth performance for 25GbE transmission over short distances in structured cabling environments.

100-Meter Transmission Distance Optimization

When paired with OM4 fiber, the module supports distances up to 100 meters, making it suitable for intra-building and intra-data center connectivity. OM3 fiber supports slightly reduced distances depending on installation conditions and link quality.

LC Connector Interface Stability

The LC duplex interface ensures secure optical alignment and minimal insertion loss. This connector type is widely used in enterprise networking due to its compact size and high reliability in high-density patch panel installations.

Thermal Design and Power Efficiency

Low Power Consumption Architecture

The SFP28 module is engineered for low power operation, typically consuming minimal wattage while maintaining full 25Gbps throughput capability. This reduces overall data center energy costs and improves thermal efficiency in high-density switch environments.

Heat Dissipation Optimization

The compact transceiver form factor includes internal thermal management design elements that ensure stable performance under continuous high-load conditions. Efficient heat dissipation prevents signal degradation and extends operational lifespan.

Energy-Efficient Data Center Deployment

By reducing per-port energy consumption, this module supports green data center initiatives focused on reducing carbon footprint while maintaining high-performance networking capabilities.

Performance Reliability and Signal Integrity

Error Rate Minimization Techniques

The optical transmitter and receiver components are optimized to maintain extremely low bit error rates (BER), ensuring data integrity during high-speed transmission. This is essential for mission-critical enterprise applications where packet loss cannot be tolerated.

Adaptive Signal Compensation

The module incorporates internal mechanisms that help maintain signal stability across varying environmental conditions, including temperature fluctuations and electromagnetic interference.

Jitter Reduction and Stability Control

Advanced timing control mechanisms reduce jitter, ensuring consistent signal synchronization across connected network devices. This improves overall network efficiency and application responsiveness.

Deployment in Cloud, AI, and High-Performance Computing Environments

Cloud Data Center Integration

The Dell SFP28-25G-SR-MLNX module is widely deployed in cloud computing infrastructures where scalable bandwidth and low-latency communication are required between compute nodes and storage systems.

AI and Machine Learning Workloads

Artificial intelligence workloads require massive data movement between GPUs, CPUs, and storage arrays. This transceiver supports these requirements by delivering consistent 25GbE throughput with minimal delay.

HPC Cluster Networking Optimization

High-performance computing clusters benefit from the module’s ability to maintain stable inter-node communication, ensuring synchronization of parallel workloads and distributed processing tasks.

Comparison with Other SFP28 and SFP+ Transceivers

Advantage Over 10GbE SFP+ Modules

Compared to traditional 10GbE SFP+ transceivers, the SFP28 25GbE module offers significantly higher bandwidth while maintaining similar physical form factor compatibility. This allows network upgrades without major hardware redesign.

Improved Bandwidth Density

Network switches equipped with SFP28 modules can achieve higher port density throughput, enabling more efficient rack utilization and reduced cabling complexity.

Backward Compatibility Considerations

In many environments, SFP28 ports support backward compatibility with SFP+ modules, providing flexibility during gradual infrastructure upgrades.

Secure Module Seating Mechanism

The transceiver features a locking mechanism that ensures secure insertion into SFP28 ports, preventing accidental disconnection during operation.

Link Initialization Process

Upon installation, the module automatically initializes link negotiation with the connected device, enabling rapid deployment and configuration-free operation in most supported environments.

Environmental and Deployment Considerations

Temperature Resilience

The module is engineered to operate within standard data center temperature ranges, ensuring stable performance in both air-cooled and high-density rack environments.

Electromagnetic Interference Resistance

Shielded design techniques help minimize interference from nearby electrical equipment, maintaining consistent signal quality even in dense server installations.

Physical Infrastructure Compatibility

The compact SFP28 form factor ensures compatibility with high-density switch chassis where space optimization is critical.