StarTech.com Cisco WSP-Q40GLR4L Comp. QSFP+ Module - 40GBASE-LR4 - 40GbE Gigabit Ethernet QSFP+ Single Mode Fiber SMF Optic Transceiver

The StarTech.com Cisco WSP-Q40GLR4L Comp. QSFP+ Module is a high-performance, Cisco-compatible transceiver designed to unlock the full potential of 40 Gigabit Ethernet networks. Engineered for enterprise-grade reliability and seamless interoperability, this QSFP+ LR4 transceiver delivers robust connectivity for data centers, campus backbones, and inter-switch links. Built to meet the demanding needs of modern networks, it combines sophisticated optical technology with straightforward deployment, reducing complexity while expanding capacity. Whether you’re upgrading an existing backbone, consolidating storage traffic, or connecting high-speed servers, this module provides a future-proof solution that balances speed, distance, and compatibility. With StarTech’s commitment to quality and Cisco compatibility, you gain a dependable, long-range link that minimizes downtime and maximizes data throughput across your IT infrastructure.

• 40GBASE-LR4 QSFP+ transceiver delivers 40 Gbps aggregate bandwidth by aggregating four 10 Gbps lanes over single-mode fiber, enabling high-capacity, scalable interconnects between core switches, routers, and storage arrays. This design supports bandwidth-hungry workloads such as virtualization, data analytics, and large-scale backups, while simplifying your cabling by replacing multiple 10G links with a single, manageable 40G path. The LR4 topology also provides robust signal integrity over longer distances, giving you the flexibility to design efficient, future-ready networks without compromising performance.
• Cisco-compatible design ensures smooth interoperability with Cisco switches and routers, reducing interop risk during upgrades. The module is tested for compatibility with Cisco’s management interfaces and hot-swapping behavior in supported platforms, delivering predictable performance and straightforward deployment. IT teams benefit from fewer compatibility surprises across firmware revisions and configuration variations, enabling quicker provisioning and fewer support escalations. This compatibility translates into a reliable, enterprise-grade transceiver that integrates into existing Cisco ecosystems with minimal configuration and maximum confidence.
• Long-range reach and resilience Up to 10 kilometers on single-mode fiber (SMF), LR4 technology supports campus backbones, data-center interconnects, and disaster-recovery links with ample headroom for future growth. The 1310 nm wavelength is optimized for low attenuation in standard SMF, delivering robust signal integrity over long distances. The design incorporates forward error correction and optical performance optimizations to mitigate fiber imperfections and environmental factors, resulting in stable link performance, reduced retransmissions, and improved application throughput. For organizations expanding networks across buildings or campuses, LR4 provides a scalable, future-proof option that minimizes the need for mid-span regeneration or wavelength conversion, while still maintaining tight optical budgets.
• Reliability, efficiency, and ease of maintenance The StarTech QSFP+ LR4 module is built for enterprise deployment, featuring sturdy construction and efficient thermal management. It is designed for hot-swappable installation in supported Cisco devices, enabling upgrades with minimal downtime. The transceiver’s power consumption is aligned with modern data-center efficiency goals, helping to manage energy budgets while delivering consistent performance. Rigorous testing and certification support stable optical and electrical interfaces, reducing troubleshooting time and extending mean time between failures. This product aligns with Cisco procurement practices and StarTech technical support, ensuring a smooth lifecycle from deployment to future upgrades.
• Plug-and-play deployment and lifecycle benefits This transceiver is designed for rapid, risk-free deployment: insert into a compatible QSFP+ slot, connect the SMF fiber link, and begin monitoring through standard management interfaces. No extensive configuration is typically required, allowing IT teams to realize immediate performance gains. As networks evolve toward higher speeds, this LR4 module supports a scalable upgrade path, enabling 40G links to anchor larger backbones or be aggregated into 100G-plus architectures. The combination of Cisco compatibility, StarTech support, and a robust LR4 implementation helps minimize upgrade risk while delivering tangible improvements in throughput and latency for latency-sensitive applications.

Technical Details of StarTech.com Cisco WSP-Q40GLR4L Comp. QSFP+ Module - 40GBASE-LR4 - 40GbE Gigabit Ethernet QSFP+ Single Mode Fiber SMF Optic Transceiver

• Form factor: QSFP+
• Standard: 40GBASE-LR4
• Data rate: 40 Gbps (4 x 10 Gbps lanes)
• Distance: Up to 10 km on Single-Mode Fiber (SMF)
• Fiber type: Single-Mode Fiber (SMF)
• Wavelength: 1310 nm
• Compatibility: Cisco switches; designed to operate within Cisco-based networks and integrated into StarTech’s broader compatibility ecosystem

how to install StarTech.com Cisco WSP-Q40GLR4L Comp. QSFP+ Module

• Prepare the hardware: Verify that your Cisco device supports QSFP+ hot-swapping and that you have a compatible link plan for LR4 on SMF. Power-down may be required on certain legacy devices, while many modern switches support hot-swapping with minimal disruption.
• Remove protective caps: Carefully remove any protective caps from the QSFP+ module and the switch port to prevent dust ingress and ensure proper seating.
• Install the module: Align the module with the QSFP+ slot and firmly insert until it latches into place. Confirm a secure connection, with the module fully seated and the locking mechanism engaged.
• Connect the fiber: Attach the single-mode fiber link according to your network design, using an appropriate LR4-compatible harness or fiber coupling as required by your patch panels and downstream equipment. Ensure fiber cleanliness and correct polarity for TX/RX paths.
• Power-on verification: Re-apply power if needed and monitor the switch management interface for transceiver recognition. Use available show or status commands to verify link status, optical power levels, and carrier detect, then perform basic throughput tests to confirm 40G performance.

Frequently asked questions

• Q: What is 40GBASE-LR4? A: It is a 40 Gigabit Ethernet transceiver standard that uses four 10 Gbps lanes over single-mode fiber, typically supporting up to 10 km distances with an LR4 optical link. It provides a single-module, high-capacity uplink between core devices and storage over fiber, reducing cabling complexity compared with multiple 10G connections.
• Q: Is this StarTech module Cisco compatible? A: Yes. This module is designed for Cisco switches and is marketed as a Cisco WSP-Q40GLR4L compatible QSFP+ transceiver, offering dependable interoperability with Cisco hardware and management tools.
• Q: What distance can I achieve with LR4? A: Up to 10 kilometers on single-mode fiber, depending on fiber quality, connector integrity, and optical budget. For longer links, ensure adequate margin and consider fiber type and installation practices to maximize reach.
• Q: Do I need a special fiber harness? A: LR4 QSFP+ links commonly use an MTP/MPO harness for the fiber side or a set of LC connections configured for 4x10G lanes, depending on the network design. Verify with your patch panel and switch documentation to determine the correct harness configuration and polarity.
• Q: How do I verify the transceiver works after installation? A: After installation, use the switch’s management interface to confirm transceiver recognition, link status, and optical power levels. Run basic connectivity tests between endpoints to validate throughput and latency, and consult vendor-specific show commands for detailed transceiver health metrics.