Startech JL484A-ST 25GBPS MMF LC Connector 850nm Optical Transceiver

Overview of STARTECH JL484A-ST 25GB Optical Transceiver

The Startech JL484A-ST compatible SFP28 module is engineered to deliver high-speed 25 Gigabit Ethernet connectivity over multimode fiber infrastructure. Designed in accordance with Multi-Source Agreement (MSA) standards, this 25GBASE-SR optical transceiver ensures seamless interoperability with a wide range of enterprise switches, routers, and network interface cards that support SFP28 ports. Built for short-range data transmission up to 100 meters (328 feet), this 850nm multimode fiber module provides a reliable and energy-efficient solution for modern data centers and high-performance network environments.

General Information

• Manufacturer: Startech
• Part Number: JL484A-ST
• Device Type: Optical Transceiver

Technical Specifications  

• Form Factor: SFP28
• Standard: 25GBASE-SR
• Wavelength: 850nm
• Maximum Distance: 100m (OM4 MMF)
• Connector Type: LC Duplex
• Fiber Type: Multimode Fiber (MMF)

Performance Features

• Maximum Data Rate: 25.78Gbps
• Hot-pluggable capability
• MSA compliant hardware
• Low electromagnetic interference (EMI)
• Secure latch mechanism for stable port connection

High-Performance 25Gbps Network Connectivity

• Supports 25 Gigabit Ethernet (25GbE) connectivity
• Data rate up to 25.78Gbps
• Optimized for short-reach SR applications
• Low bit error rate for dependable transmission
• High-speed data center interconnect capability

Multimode Fiber Compatibility

• Supports OM3 MMF up to 70 meters
• Supports OM4 MMF up to 100 meters (328 feet)
• Operates at 850nm VCSEL wavelength
• Designed for short-range enterprise networks

LC Duplex Connector Interface

• Standard duplex LC optical interface
• Hot-pluggable SFP28 form factor
• Compact and space-saving design

Vendor Interoperability

• Fully compliant with SFP28 MSA standards
• Compatible with supported 25GbE SFP28 ports
• Digitally encoded for accurate device recognition
• Plug-and-play installation

Optimized for Modern Data Centers

• Data center aggregation layers
• High-performance computing clusters
• Cloud service provider networks
• Enterprise campus backbone links
• Network-attached storage (NAS) and SAN environments

Operational Advantages

• Low power dissipation for energy savings
• Supports Digital Diagnostic Monitoring (DDM/DOM)
• Real-time monitoring of temperature, voltage, and optical output
• Enhanced network visibility and maintenance

Advanced Optical Engineering

• Precision-calibrated laser components
• Optimized receiver sensitivity
• Reduced insertion loss
• High signal-to-noise ratio

Cost-Effective Alternative to OEM Optics

• Economical networking expansion
• Tested for compatibility and performance
• Reliable replacement or spare module option

Compact Form Factor

• Supports high-density switch deployments
• Reduces rack space utilization
• Enhances airflow in networking cabinets

Quality and Durability Features

• Industrial-grade build quality
• Stable optical output across operating temperatures
• Reliable latch and locking mechanism
• Designed for 24/7 network uptime

Future-Ready 25 Gigabit Infrastructure Upgrade

• Ideal step between 10GbE and 40GbE/100GbE solutions
• Improves server-to-switch connectivity
• Supports virtualization and hyper-converged infrastructure
• Enhances data transfer efficiency

Key Benefits of SFP28 Optical Transceiver

• High-speed 25Gbps optical connectivity
• Short-range transmission up to 100 meters
• Multimode fiber compatibility (OM3/OM4)
• LC duplex connector interface
• MSA-compliant interoperability
• Hot-swappable design for operational flexibility
• Low power consumption and thermal efficiency

Outline of StarTech JL484A-ST 25 Gigabits MMF Transceiver

The StarTech JL484A-ST compatible SFP28 module is a high-performance 25GBASE-SR optical transceiver engineered to deliver 25Gbps data transmission over multimode fiber (MMF) cabling at distances of up to 100 meters (328 feet). Designed to meet MSA (Multi-Source Agreement) standards, this 25 Gigabit optical transceiver ensures seamless interoperability with a wide range of enterprise switches, routers, network interface cards, and storage devices. Operating at an 850nm wavelength and utilizing an LC duplex connector, this compact hot-pluggable module is optimized for high-speed data center, cloud, enterprise campus, and high-density network environments requiring reliable, low-latency connectivity.

High-Speed 25Gbps Data Transmission for Modern Networks

The 25GBASE-SR SFP28 transceiver category represents a critical evolution in Ethernet connectivity, bridging the performance gap between 10 Gigabit and 40 Gigabit networking infrastructures. By delivering 25Gbps bandwidth over multimode fiber, the StarTech JL484A-ST compatible module enables organizations to scale server-to-switch and switch-to-switch links without the cost and complexity of migrating to higher-speed parallel optics.

Operating at 25 gigabits per second, this SFP28 optical module is ideal for high-throughput applications such as virtualization clusters, high-performance computing environments, real-time data analytics platforms, and storage area networks. The increased lane speed allows data centers to achieve higher port density while reducing overall cabling requirements compared to multi-lane 40G solutions.

Optimized for Short-Range Multimode Fiber Deployments

This 25GBASE-SR optical transceiver is specifically designed for short-range transmission over OM3 and OM4 multimode fiber. With a maximum reach of 100 meters on OM4 fiber and slightly shorter distances on OM3 fiber, it is perfectly suited for in-rack, adjacent-rack, and intra-data center interconnect applications.

The 850nm VCSEL (Vertical-Cavity Surface-Emitting Laser) technology ensures efficient optical signal generation with low power consumption and stable performance. The LC duplex connector design simplifies installation and maintenance, providing secure and reliable fiber termination in high-density patch panels and structured cabling systems.

MSA-Compliant SFP28 Optical Transceiver Design

Compliance with Multi-Source Agreement standards guarantees that the StarTech JL484A-ST compatible SFP28 module adheres to industry-defined electrical and mechanical specifications. This ensures compatibility across a wide range of networking hardware platforms that support SFP28 25GBASE-SR interfaces.

Hot-Pluggable Form Factor for Flexible Deployment

The SFP28 form factor supports hot-pluggable functionality, allowing network administrators to install or replace the transceiver without powering down connected equipment. This capability minimizes downtime and enhances operational flexibility in mission-critical network infrastructures.

The compact footprint of the SFP28 module enables higher port density on switches and network interface cards. Compared to larger QSFP modules, SFP28 transceivers allow more individual high-speed links within the same chassis space, optimizing rack utilization and airflow efficiency.

Electrical and Optical Interface Standards

This 25 Gigabit optical transceiver complies with IEEE 802.3by 25GBASE-SR standards, ensuring consistent signal integrity and interoperability. It supports digital diagnostics monitoring (DDM), providing real-time visibility into parameters such as optical output power, receive power, module temperature, and supply voltage. These monitoring capabilities enhance proactive maintenance and network reliability.

Enterprise Data Center Connectivity Applications

The StarTech JL484A-ST compatible SFP28 module is widely deployed in modern data center environments where performance, scalability, and reliability are paramount. Its 25Gbps throughput makes it particularly effective in leaf-spine architectures, where high-bandwidth east-west traffic flows between servers and switches.

Server-to-Switch Connectivity

In top-of-rack (ToR) or end-of-row (EoR) switching architectures, 25G SFP28 transceivers enable high-speed connections between servers equipped with 25G network interface cards and aggregation or access switches. This configuration supports bandwidth-intensive workloads such as virtualization clusters, containerized applications, and distributed storage platforms.

Switch-to-Switch Aggregation

For switch uplinks within a rack or between adjacent racks, the 25GBASE-SR module provides efficient short-range interconnectivity. By delivering single-lane 25Gbps bandwidth, it reduces the need for multiple 10G links while simplifying network design and improving overall throughput.

Cloud Computing and Virtualization Environments

Cloud service providers and enterprise IT departments increasingly rely on 25 Gigabit Ethernet to support scalable and elastic infrastructure. The JL484A-ST compatible SFP28 module supports high-density virtualization environments where numerous virtual machines share network resources.

Enhanced East-West Traffic Handling

Modern data centers generate substantial east-west traffic due to microservices architectures, distributed databases, and clustered applications. The 25Gbps speed offered by this optical transceiver ensures low-latency communication between compute nodes, improving application responsiveness and resource efficiency.

Support for Hyper-Converged Infrastructure

Hyper-converged infrastructure platforms integrate compute, storage, and networking resources. The 25GBASE-SR SFP28 module provides the high-speed connectivity required for synchronized data replication, real-time analytics, and storage traffic consolidation within such environments.

Technical Specifications and Optical Characteristics

Wavelength and Laser Technology

The module operates at an 850nm wavelength, utilizing advanced VCSEL technology to generate stable optical signals. This wavelength is optimized for multimode fiber transmission, offering reliable short-distance communication with minimal signal attenuation.

Connector Type and Fiber Compatibility

The LC duplex connector ensures a compact, secure fiber interface compatible with standard multimode patch cables. The module supports OM3 and OM4 multimode fiber types, delivering up to 100 meters transmission distance on OM4 fiber infrastructure.

Data Rate and Encoding

Supporting a full 25Gbps data rate, the transceiver is designed for high-speed Ethernet environments requiring consistent throughput and minimal packet loss. It aligns with IEEE 25GBASE-SR standards to ensure interoperability across compliant networking devices.

Energy Efficiency and Thermal Performance

Power consumption is a critical consideration in dense data center environments. The SFP28 25GBASE-SR module is engineered for low power usage, helping reduce overall operational costs while maintaining stable performance. Efficient thermal management ensures consistent signal integrity even in high-density switch deployments.

Operating Temperature Range

The transceiver is designed to operate within a standard commercial temperature range, supporting deployment in climate-controlled data centers and enterprise wiring closets. Reliable thermal tolerance ensures consistent functionality under continuous high-bandwidth workloads.

Compatibility and Interoperability

The StarTech JL484A-ST compatible SFP28 optical module is programmed and tested for compatibility with a broad range of network switches and routers that support 25G SFP28 interfaces. MSA compliance ensures that the module meets standardized specifications for seamless integration.

Plug-and-Play Integration

Network administrators benefit from straightforward plug-and-play deployment. Once inserted into a compatible SFP28 port, the module is automatically recognized by supported devices, enabling rapid provisioning and configuration.

Digital Diagnostics Monitoring Support

With built-in DDM capabilities, IT teams can monitor performance metrics in real time. This visibility supports proactive troubleshooting and predictive maintenance, reducing unexpected downtime and enhancing network stability.

Scalable Network Architecture Support

As organizations transition from 10 Gigabit Ethernet to 25 Gigabit infrastructure, SFP28 modules provide a cost-effective migration path. By leveraging existing multimode fiber cabling where applicable, businesses can increase bandwidth without a complete overhaul of their physical infrastructure.

Future-Ready Infrastructure Investment

The adoption of 25Gbps Ethernet prepares networks for emerging workloads such as artificial intelligence processing, big data analytics, and high-frequency transaction systems. The JL484A-ST compatible SFP28 transceiver enables scalable growth while maintaining budget efficiency.

Advantages Over Legacy 10G Optical Modules

Compared to 10G SFP+ transceivers, 25G SFP28 modules offer 2.5 times the bandwidth per lane while maintaining similar form factor dimensions. This allows organizations to increase network capacity without significantly expanding physical infrastructure or power requirements.

Improved Port Density

By utilizing single-lane 25Gbps transmission, SFP28 modules deliver higher bandwidth per port. This results in better utilization of switch ports and reduced cabling complexity compared to aggregated 10G connections.

Reduced Cost Per Gigabit

25 Gigabit Ethernet provides a more favorable cost-per-gigabit ratio than 10G in many modern deployments. The use of existing multimode fiber infrastructure further enhances the economic advantage of upgrading to 25GBASE-SR optical modules.

Use Cases in Enterprise Campus Networks

Beyond data centers, 25GBASE-SR SFP28 transceivers are increasingly deployed in enterprise campus backbones and aggregation layers. High-bandwidth connectivity supports unified communications, video conferencing platforms, large-scale file transfers, and centralized storage access.

High-Density Core Switch Uplinks

Core and distribution layer switches benefit from 25Gbps uplinks that handle aggregated traffic from multiple access switches. This ensures minimal congestion during peak usage periods.

Secure and Reliable Fiber-Based Communication

Optical fiber connectivity inherently provides enhanced security and immunity to electromagnetic interference. The use of multimode fiber with LC connectors supports clean, interference-free signal transmission in electrically noisy environments.

Quality Assurance and Reliability

Each StarTech JL484A-ST compatible SFP28 optical transceiver undergoes rigorous testing to ensure signal integrity, performance consistency, and compatibility with designated hardware platforms. Strict quality control measures guarantee dependable operation in enterprise and data center environments.

Durable Construction

The robust metal housing enhances electromagnetic shielding and structural durability. This design supports long-term deployment in high-density network equipment racks.

Long-Term Network Stability

By adhering to IEEE and MSA standards, the 25GBASE-SR SFP28 module provides stable, standardized performance. Its combination of 25Gbps throughput, 850nm operation, LC connectivity, and multimode fiber compatibility makes it an essential component for scalable, high-speed optical networking solutions.