SFP28-10G-25G-85C Dell SFP28 SR 85C Transceiver Module

Dell SFP28-10G-25G-85C 10/25GbE Transceiver Module 

The Dell SFP28-10G-25G-85C Dual Rate SFP28 SR Transceiver Module is a high-efficiency optical networking component designed for scalable enterprise infrastructure and next-generation data center environments. Engineered to support both 10GbE and 25GbE data rates, this transceiver provides flexible connectivity, enhanced bandwidth performance, and reliable short-range optical transmission over multimode fiber.

Built for demanding workloads, this Dell optical module ensures stable signal integrity, low latency communication, and energy-efficient operation in high-density switching environments.

General Information 

• Manufacturer: Dell
• Part Number: SFP28-10G-25G-85C
• Device Type: Optical Transceiver Module

Technical Specifications

• Form Factor: SFP28 (Small Form-Factor Pluggable 28)
• Dual-rate networking transceiver
• Short-range (SR) fiber optic module
• Enterprise-grade data center interconnect component
• High-speed Ethernet communication module

Key Features of Dell SFP28 Dual Rate Transceiver

• Supports 10GBASE-SR and 25GBASE-SR standards
• Backward and forward compatibility for scalable deployment
• Ideal for upgradeable network architectures

High-Speed Optical Performance

• Low signal degradation over short distances
• Enhanced bandwidth efficiency
• Reliable performance in dense networking setups

85°C Industrial Temperature Rating

• Stable performance under elevated temperatures
• Optimized for enterprise data centers
• Improved durability in continuous operation

Optical and Electrical Characteristics

• Data Rate: 10Gbps / 25Gbps dual-mode
• Fiber Type: Multimode Fiber (MMF)
• Connector Type: LC Duplex Interface
• Transmission Standard: IEEE-compliant SR protocols

Transmission Range and Efficiency

• Short-range data center interconnect solution
• Optimized for high-density switch fabrics
• Reduced latency for real-time applications

Power Consumption and Efficiency

• Low power consumption design
• Heat-efficient optical signaling
• Supports green data center initiatives

Use Cases and Application Scenarios

• Server-to-switch connectivity
• Leaf-spine architecture networks
• High-performance computing clusters

Cloud and Virtualized Infrastructure

• Virtual machine clustering
• Cloud storage synchronization
• Distributed computing workloads

Storage Area Networks (SAN)

• High-speed SAN interconnects
• Backup and replication systems
• Enterprise storage expansion

Advantages of Dell SFP28-10G-25G-85C Module

• Supports network growth and expansion
• Reduces hardware replacement costs
• Compatible with modern switching platforms

Enterprise-Grade Engineering Quality

• Certified manufacturing standards
• Extensive compatibility testing
• Designed for enterprise workloads

Dell SFP28-10G-25G-85C SFP28 SR Transceiver Module 

The Dell SFP28-10G-25G-85C 10/25GbE Dual Rate SFP28 SR 85°C Transceiver Module category represents a high-performance class of short-reach optical networking components designed for modern data center and enterprise Ethernet infrastructures. Developed and validated for compatibility with advanced switching and server environments, this transceiver category supports flexible data rates of both 10 Gigabit Ethernet and 25 Gigabit Ethernet, ensuring seamless scalability across evolving network architectures. Within enterprise-grade ecosystems powered by , these modules are widely deployed for high-density switch interconnects, server uplinks, and top-of-rack (ToR) networking deployments where reliability, thermal endurance, and bandwidth flexibility are essential.

Engineered for multimode fiber (MMF) connectivity using short-range SR (Short Reach) optics, this SFP28 transceiver class leverages 850nm wavelength VCSEL technology to achieve consistent performance over structured cabling environments. The 85°C industrial temperature rating further enhances operational stability, making it suitable for high-density racks, edge computing deployments, and environments with elevated thermal loads.

Technical Foundation of SFP28 10/25G Dual Rate SR Optics

Core Optical Technology and Architecture

The SFP28 form factor is an evolution of the SFP+ standard, designed specifically to support 25Gbps per lane signaling while maintaining backward compatibility with 10Gbps Ethernet systems. The dual-rate capability of the Dell SFP28-10G-25G-85C module allows dynamic operation at either 10GbE or 25GbE depending on switch configuration, enabling infrastructure flexibility and cost optimization.

At its core, the module uses Vertical-Cavity Surface-Emitting Laser (VCSEL) technology operating at 850nm wavelength. This optical approach is optimized for multimode fiber types such as OM3 and OM4, delivering low-latency transmission with minimal dispersion over short distances typically up to 70m on OM3 and 100m on OM4 fiber.

Signal Processing and Data Encoding

The transceiver utilizes advanced signal encoding techniques such as NRZ (Non-Return-to-Zero) for 25GbE and optimized modulation handling for backward-compatible 10GbE operation. This ensures consistent bit error rate (BER) performance across both operational modes while maintaining signal integrity in dense switching environments.

Backward Compatibility and Interoperability

One of the defining advantages of this category is its interoperability with legacy 10GbE infrastructure. Organizations transitioning from 10G to 25G networks can deploy these modules in mixed environments without requiring immediate full-scale hardware replacement, significantly reducing capital expenditure while improving bandwidth scalability.

Performance Characteristics and Operational Advantages

Bandwidth Efficiency and Throughput Optimization

The Dell SFP28-10G-25G-85C transceiver module supports aggregate throughput efficiency that is essential for modern virtualization, cloud computing, and high-performance storage networks. With 25GbE operation, it delivers significantly improved bandwidth density compared to traditional 10GbE SFP+ modules, allowing more efficient use of switch port resources.

In hyperscale environments, this improvement translates into reduced cabling complexity and improved airflow management within data center racks. The compact SFP28 form factor allows higher port density per switch chassis, enabling network architects to maximize infrastructure utilization.

Low Latency Performance

Latency optimization is a critical factor in high-frequency trading systems, distributed computing clusters, and real-time analytics platforms. The short-reach design of this transceiver ensures minimal propagation delay, allowing near-instant data transmission across server nodes and storage arrays.

Power Efficiency and Thermal Stability

Designed for energy-efficient operation, the module consumes low power compared to higher-range optical solutions. The 85°C operating temperature specification ensures stable performance even in thermally constrained environments, reducing the need for aggressive cooling mechanisms within network cabinets.

Physical Design and Form Factor Engineering

SFP28 Compact Architecture

The SFP28 form factor maintains a compact footprint identical to SFP+ modules while supporting higher data rates. This backward-compatible physical design allows network equipment manufacturers to integrate 25GbE support without redesigning existing switch port layouts.

The module features a hot-swappable design, enabling seamless replacement or upgrades without network downtime. This is particularly important in mission-critical environments where continuous availability is required.

Connector and Interface Design

The LC duplex connector interface ensures reliable optical coupling with multimode fiber patch cables. Precision-engineered ferrules maintain alignment accuracy, minimizing insertion loss and reflection levels. This contributes to improved signal clarity and reduced transmission errors.

Durability and Mechanical Reliability

Built for enterprise-grade resilience, the module is designed to withstand frequent insertion cycles, vibration in rack-mounted systems, and long-term continuous operation. The reinforced housing structure ensures stable performance in dense switch environments.

Network Deployment Scenarios and Use Cases

Data Center Fabric Architectures

In modern leaf-spine data center architectures, the Dell SFP28-10G-25G-85C module plays a critical role in inter-switch connectivity. The ability to operate at both 10G and 25G allows flexible scaling of network fabrics without disrupting existing topology.

Top-of-Rack and End-of-Row Switching

Top-of-rack deployments benefit significantly from the compact nature and high bandwidth of SFP28 SR modules. By connecting servers directly to ToR switches, organizations can reduce latency and improve network efficiency while simplifying cable management.

Cloud Infrastructure and Virtualization Clusters

Virtualized environments rely heavily on high-speed interconnects between compute nodes and storage systems. The dual-rate functionality allows cloud service providers to standardize on a single transceiver type across mixed-generation hardware deployments.

High-Performance Computing Environments

HPC clusters require ultra-low latency and high-throughput interconnects to support parallel processing workloads. The SFP28 SR architecture ensures consistent data flow between compute nodes, reducing bottlenecks in distributed computing workloads.

Compatibility and Ecosystem Integration

Switch and Server Compatibility

Within Dell networking ecosystems, these modules are validated for compatibility across a wide range of enterprise switches and network interface cards (NICs). They are commonly deployed in environments requiring interoperability across mixed hardware generations.

Multi-Vendor Network Environments

Although optimized for Dell infrastructure, the SFP28 standard ensures broad compatibility with third-party networking equipment that adheres to IEEE 802.3by standards. This enables flexible integration in heterogeneous data center environments.

Firmware and Auto-Detection Features

Modern switches often include auto-negotiation and transceiver detection capabilities that automatically identify module type and configure optimal operating parameters. This reduces manual configuration overhead and simplifies deployment processes.

Reliability, Temperature Rating, and Environmental Resilience

85°C Extended Temperature Specification

A key differentiator of the Dell SFP28-10G-25G-85C module is its extended operating temperature rating of up to 85°C. This ensures stable performance in high-density environments where airflow may be restricted or where multiple high-power devices generate significant heat.

Thermal Management in Dense Environments

In modern data centers, thermal management is a critical design consideration. The ability of this module to maintain optical stability under elevated temperatures reduces the risk of performance degradation and extends operational lifespan.

Environmental Stress Resistance

The module is engineered to resist environmental stress factors such as thermal cycling, humidity variation, and continuous operational load. This contributes to long-term reliability in enterprise deployments.

Transition from 10G to 25G Infrastructure

Organizations transitioning toward higher bandwidth requirements benefit from the dual-rate nature of this transceiver. It enables gradual migration strategies where infrastructure can be upgraded incrementally without full replacement of existing systems.

Network Expansion Flexibility

As data consumption continues to grow due to cloud services, AI workloads, and large-scale analytics, scalable networking components like SFP28 SR modules ensure infrastructure can evolve without architectural disruption.

Signal Integrity and Optical Performance Optimization

Low Bit Error Rate Transmission

The Dell SFP28-10G-25G-85C module is optimized for low bit error rate performance, ensuring high-quality data transmission even in dense switching fabrics. Advanced internal calibration and signal conditioning help maintain accuracy across varying workloads.

Multimode Fiber Optimization

Designed specifically for multimode fiber environments, the module ensures optimal performance with OM3 and OM4 cabling standards. This allows cost-effective deployment compared to single-mode fiber systems while maintaining high-speed capabilities.

Insertion Loss and Reflection Control

Precision optical alignment reduces insertion loss and minimizes back reflection, which enhances signal clarity and reduces retransmission overhead in high-speed networks.