Chelsio SM100G-SR: 100G Short Reach QSFP28 Optical Module

Experience blazing-fast 100 Gigabit Ethernet with Chelsio’s SM100G-SR QSFP28 short-reach optical module. Engineered for data centers, hyperscale deployments, and enterprise networks, this transceiver brings high-density 100G connectivity to multimode fiber (MMF) infrastructures. Designed to pair seamlessly with Chelsio’s 100-Gigabit Ethernet Unified Wire adapters, the SM100G-SR delivers a compelling combination of performance, efficiency, and reliability. It is built to withstand the rigors of modern network environments, offering robust link budgets, precise optical performance, and advanced diagnostics that help minimize downtime. Whether you’re upgrading a dense server rack, expanding a leaf-spine topology, or refreshing a backbone link, this transceiver provides a cost-effective solution that aligns with your scale and workflow. Chelsio’s commitment to quality ensures that the SM100G-SR is engineered for long-term operation in data centers that demand predictable latency, high throughput, and consistent performance under load.

• 100G QSFP28 short-reach transceiver designed for 100 Gigabit Ethernet links over multimode fiber. This module supports the high-density QSFP28 form factor, enabling rapid acceleration of data-center uplinks and server-to-switch connectivity with a single hot-swappable device. Its four parallel lanes provide substantial bandwidth for demanding workloads, including AI inference, real-time analytics, and high-performance computing clusters. The SM100G-SR is optimized to maximize efficiency while meeting the strict reliability requirements of enterprise-grade networks, making it ideal for modern data centers seeking to scale without sacrificing stability or simplicity.
• Multimode fiber compatibility with SR optics optimized for short-reach MMF deployments (OM3/OM4). The module is purpose-built for standard data-center fiber plants, enabling cost-effective upgrades that leverage existing cabling. With robust optical power budgeting and sensitivity, it supports stable 100G links across typical data-center distances, reducing the need for expensive single-mode rewiring. The SR optoelectronics are calibrated to deliver clean signal integrity across multi-lane transmission, ensuring reliable performance in dense rack environments where cooling and space are at a premium.
• MPO/MTP connector interface for high-density cabling featuring a 12-fiber MPO/MTP interface. This enables efficient fiber management in large-scale deployments and supports 4-lane parallel transmission, which is the hallmark of 100GBASE-SR4. The rugged hermetic housing protects delicate optical interfaces from environmental contaminants, while alignment-efficient ferrule assemblies promote consistent connector performance. This connector standard is widely adopted in data centers, making the SM100G-SR an interoperable choice for multi-vendor ecosystems and cross-data-center interconnects.
• Digital Diagnostics Monitoring (DDM) and robust diagnostics to provide real-time visibility into operating conditions. With DDM support, technicians can monitor parameters such as optical power, temperature, supply voltage, and laser bias, enabling proactive maintenance and rapid fault isolation. This capability minimizes unexpected downtime and simplifies management in high-availability environments. The built-in diagnostic capabilities integrate with standard network management tools, helping administrators track performance trends, verify link integrity, and optimize capacity planning over time.
• Low power consumption and high reliability designed for efficiency in dense deployments. The SM100G-SR balances power usage with thermal performance, contributing to lower total cost of ownership in power-constrained data centers. Its rugged construction and electrostatic discharge protection, combined with Chelsio’s emphasis on component quality, deliver a transceiver that remains stable under load and across many hot-swapped cycles. This makes it suitable for high-density racks, blade servers, and virtualized environments where power budgets and cooling are critical considerations.

Technical Details of Chelsio SM100G-SR

• Form Factor: QSFP28
• Data Rate: 100 Gbps (4 × 25.78 Gbps lanes)
• Transmitter/Receiver: 850 nm VCSEL-based MMF optics
• Fiber Type: Multimode fiber (OM3/OM4 recommended)
• Connector: MPO/MTP (12-fiber) interface
• Wavelength: 850 nm (MMF ecosystem)
• Reach: Short reach MMF; optimized for typical data-center distances
• Standards: 100GBASE-SR4, IEEE 802.3bm common alignment
• Diagnostics: Digital Diagnostics Monitoring (DDM) support
• Compatibility: Certified for use with Chelsio 100-Gigabit Ethernet Unified Wire adapters
• Power and Thermal: Optimized for energy efficiency and stable operation in dense environments

How to install Chelsio SM100G-SR

Installing the SM100G-SR is designed to be straightforward for data-center technicians familiar with QSFP28 modules. Begin by powering down the host server or switch if required by your protocol and equipment guidelines. Locate an available QSFP28 slot in the switch, NIC, or router chassis that supports 100G SR optics, ensuring the slot is compatible with a hot-swappable transceiver. Remove the protective dust cover from the module and align the SM100G-SR with the connector in the slot, then firmly but gently insert until it seats with a click indicating proper engagement. Ensure the adjacent modules are clear of obstruction to avoid undue mechanical stress on the fiber cables. Connect a high-quality MPO/MTP MMF fiber cable to the transceiver’s MPO/MTP port, and route the fiber with proper bend-radius management to prevent micro-bends and loss of signal integrity. On power-up, verify that the link status is established on both ends of the 100G link. Use the host management interface to confirm the 100G link is up and to read diagnostic data if available. If Digital Diagnostics Monitoring is supported, review the optical power, temperature, and voltage readings to confirm the transceiver operates within expected ranges. In multi-vendor environments, validate interoperability by testing throughput and latency across the link under typical workloads. Periodic health checks via the DDM interface can help catch drift in temperature or power before performance dips occur, ensuring consistent, reliable operation in busy data-center networks.

Frequently asked questions

• What is the Chelsio SM100G-SR designed for?

  The SM100G-SR is a 100G QSFP28 short-reach optical module designed for multimode fiber in data centers. It is intended to pair with Chelsio’s 100-Gigabit Ethernet Unified Wire adapters to deliver scalable and power-efficient high-speed connectivity across server-to-switch links and dense switching fabrics.

• Which fiber and connector does it use?

  The module uses multimode fiber with an MPO/MTP (12-fiber) connector and 850 nm SR optics. It is optimized for OM3/OM4 MMF, providing reliable 100G uplinks in typical data-center deployments while supporting high-density cabling layouts.

• Does it support Digital Diagnostics Monitoring (DDM)?

  Yes. The SM100G-SR includes DDM to monitor critical parameters such as optical power, temperature, and voltage. This enables proactive maintenance, faster fault isolation, and improved visibility across the network’s 100G links.

• What standards and compatibility are guaranteed?

  The transceiver adheres to the 100GBASE-SR4 standard and is certified for use with Chelsio’s Unified Wire adapters, ensuring interoperability within Chelsio ecosystems as well as many multi-vendor data-center environments that support QSFP28 SR4 optics.