StarTech.com Arista QSFP-40G-SR4 Compatible QSFP+ Module – 40GBASE-SR4 Transceiver

The StarTech.com Arista QSFP-40G-SR4 Compatible QSFP+ Module is engineered to boost data center performance with high-speed, reliable fiber optic connectivity. Designed for 40GBASE-SR4 applications, this QSFP+ transceiver enables four parallel 10 Gbps channels that combine to deliver a full 40 Gbps duplex link over multimode fiber. It’s crafted to work seamlessly in Arista environments and is widely compatible with QSFP+ ports across leading network devices, offering a cost-effective yet dependable solution for demanding enterprise networks. With Digital Diagnostics Monitoring (DDM) support, you can monitor critical parameters such as optical power, temperature, and supply voltage in real time, helping you optimize link quality and quickly pinpoint issues before they degrade performance. The module supports multi-mode fiber systems up to 150 meters on modern OM4 cabling, making it ideal for top-of-rack, spine-leaf, and Uplink/backbone connections within data centers seeking density, scalability, and resilience. Whether you’re refreshing an aging uplink fleet or deploying new, high-density fabrics, this SR4 transceiver delivers plug-and-play ease with robust compatibility and verified performance in real-world networks.

• High-density 40GBASE-SR4 performance in a compact QSFP+ form factor — Four 10 Gbps lanes operate in parallel to provide a full 40 Gbps link over multimode fiber, enabling efficient, scalable uplinks and interconnects in modern data centers. This module is designed for seamless integration with Arista switches and other QSFP+ ports, delivering reliable, low-latency throughput for applications ranging from virtualization to storage networks. Its MSA-compliant design ensures broad compatibility across a wide range of devices, helping you simplify procurement and inventory management while maintaining performance integrity in your fabric.
• Optimized multimode fiber reach with 850 nm transceiver optics — The 850 nm VCSEL-based SR4 design supports OM4 (and OM3) multimode fiber, delivering up to 150 meters on OM4 cabling and up to 100 meters on standard OM3 systems. The parallel 4x10 Gbps channels maximize bandwidth within data center racks, enabling fast, reliable server-to-switch connections and robust uplink performance for demanding workloads such as AI, analytics, and database services. The MPO/MTP connector interface permits streamlined cabling within dense fiber trunks, helping you keep pathways organized and scalable as your network grows.
• Digital Diagnostics Monitoring (DDM) for proactive health management — With built-in DDM support, administrators can monitor optical power levels, internal temperature, and supply voltage in real time. This visibility simplifies fault isolation, reduces mean time to repair (MTTR), and supports proactive maintenance programs. DDM data can be integrated with your network management system or used with vendor-provided tools to alert on drift in performance, enabling preemptive actions before link degradation impacts applications.
• Robust reliability, safety, and compatibility — This StarTech.com module is engineered for rugged data center environments with protective housing, ESD tolerance, and careful thermal management. As a compatible QSFP+ SR4 module, it’s designed to behave like an OEM part while offering the flexibility and cost advantages of an independent supplier. It is hot-swappable in supported switches, reducing downtime during upgrades or replacements, and it carries a comprehensive warranty aligned with enterprise deployment expectations. The result is dependable operation across diverse workloads, mixed vendor ecosystems, and rapidly evolving data center topologies.
• Simple deployment and broad interoperability — Plug-and-play in most QSFP+ ports, with straightforward cabling using standard multimode fiber. The module supports common network architectures—from rack-scale leaf-spine to aggregation layers—ensuring consistent performance with predictable link latency. Its compatibility with Arista devices makes it an attractive option for organizations seeking a reliable, economical upgrade path that preserves network topology choices and minimizes disruption during transition.

Technical Details of StarTech.com Arista QSFP-40G-SR4 Compatible QSFP+ Module

• Form Factor: QSFP+
• Standard: 40GBASE-SR4
• Interface/Data Rate: QSFP+ transceiver delivering 40 Gbps aggregate bandwidth
• Fiber Type: Multimode fiber (MMF) compatibility with OM3/OM4 cabling
• Distance (OM4/OM3): Up to 150 meters on OM4; up to 100 meters on OM3
• Connector: MPO/MTP 12-Fiber interface (4 TX/4 RX channels used for SR4)
• Wavelength: 850 nm VCSEL optics
• DDM: Digital Diagnostics Monitoring supported
• MSA Compliance: QSFP+ MSA compliant
• Hot-Swappable: Yes, in compatible switches
• Operating Temperature: -40°C to 85°C
• Power Consumption: Typical around 1.5W; maximum varies by model
• Compatibility: Designed for Arista QSFP+ ports and other 40GbE-capable devices

How to install StarTech.com Arista QSFP-40G-SR4 Compatible QSFP+ Module

Installing this QSFP+ SR4 transceiver is straightforward, and the process is designed to minimize downtime. Follow these steps to ensure a successful deployment:

1) Verify switch compatibility and port readiness. Confirm that your Arista switch or other QSFP+ port supports 40GBASE-SR4 and accepts third-party transceiver modules. Review your device’s documentation for any vendor-specific requirements or whitelist lists.

2) Power considerations. QSFP+ transceivers are typically hot-swappable, allowing you to replace or add modules without powering down the entire chassis. If your environment requires maintenance windows, follow your standard change management procedures.

3) Prepare the fiber cable. Use multimode fiber cable (OM4 recommended for extended reach). Ensure the fiber termini are clean and free of dust. Align the MPO/MTP connector correctly, noting MPO polarity and fiber position to avoid misrouting or polarity issues.

4) Insert the module. Gently align the QSFP+ module with the slot and slide it in until the latch engages. Avoid excessive force; if the latch does not click, reseat the module. Once seated, the device should register the transceiver and begin link negotiation automatically.

5) Connect the fiber and validate. Attach the MPO/MTP fiber cable to the corresponding port on the switch and the adjacent device. Power up the link and verify that a 40G link comes up. Use the switch’s management interface to confirm the 40GBASE-SR4 mode and monitor the link status. If available, enable DDM monitoring to observe real-time optical power, temperature, and current consumption, and address any out-of-spec readings promptly.

6) Troubleshooting basics. If the link does not come up, check fiber polarity, confirm OM4 compatibility, verify proper MPO connector alignment, and ensure there is no crosstalk or macro-bending in the fiber run. Confirm that both ends are configured for SR4 operation and that the appropriate cable length and fiber grade are used. When in doubt, swap ends or test with a known-good fiber patch to isolate the fault.

Frequently asked questions

• Q: Is this module compatible with Arista switches?
  A: Yes. The StarTech.com QSFP-40G-SR4 module is designed to be compatible with Arista QSFP+ ports and other 40GbE devices that support SR4 transceivers. Always verify device compatibility with your specific model and firmware version.
• Q: What is the maximum fiber distance for this transceiver?
  A: The SR4 transceiver supports up to 150 meters on OM4 multimode fiber and up to 100 meters on OM3 fiber. Distance can vary based on fiber quality, connector quality, and network conditions.
• Q: Does this transceiver support Digital Diagnostics Monitoring (DDM)?
  A: Yes. DDM is supported, providing real-time visibility into optical power, temperature, and other key parameters to help with proactive maintenance and quick fault isolation.
• Q: Can I install this module while the system is powered?
  A: In most cases, QSFP+ modules are hot-swappable, allowing installation with the device powered on. However, follow your organization’s safety and change-management procedures and consult device documentation to confirm compatibility for hot-swapping in your environment.
• Q: Is there a warranty?
  A: Yes. The StarTech.com transceiver typically ships with a limited warranty. Warranty terms may vary by region and distributor; consult the product page or your seller for the exact coverage period and conditions.