StarTech Cisco QSFP-40G-LR4-S Comp. QSFP+ Module — 40GBASE-LR4 SMF Transceiver

Experience enterprise-grade performance with the StarTech Cisco QSFP-40G-LR4-S Comp. QSFP+ Module, a Cisco-compatible 40GBASE-LR4 transceiver designed for high-density data centers, university campuses, and mission-critical backbones. This QSFP+ module delivers reliable, long-haul 40 Gigabit Ethernet over single-mode fiber (SMF) with 1270 nm to 1330 nm wavelengths, enabling four parallel 10 Gbps lanes that converge into a robust 40 Gbps link. Optimized for compatibility with Cisco QSFP ports, it’s also MSA-compliant and hot-swappable, meaning you can upgrade or replace transceivers without powering down equipment. With digital diagnostic monitoring (DDM), you gain real-time visibility into optical power, temperature, and other critical parameters, helping you maximize uptime and maintain link quality. From core data-center backbones to campus interconnects, this LR4 transceiver is engineered for dependable long-range performance up to 10 kilometers on SMF, making it an ideal choice for modern, multi-vendor networks that demand seamless interoperability and lasting reliability. Supported by a lifetime warranty, this transceiver provides a cost-effective, future-proof solution for next-generation 40G networking.

• 40GBASE-LR4 performance through a StarTech Cisco QSFP-40G-LR4-S Comp. QSFP+ module, delivering four 10 Gbps lanes for aggregated 40 Gbps Ethernet over single-mode fiber (SMF).
• Wavelengths of 1270 nm and 1330 nm with a reach up to 10 kilometers (6.2 miles), enabling long-haul, high-bandwidth links across data centers and campus networks.
• MSA-compliant, hot-swappable QSFP+ transceiver designed to plug into standard QSFP+ ports and provide Cisco compatibility, minimizing network downtime during upgrades or maintenance.
• Digital Diagnostic Monitoring (DDM) support for real-time health metrics, including optical power, temperature, and supply voltage, allowing proactive fault detection and quick troubleshooting.
• LC duplex connector interface with a rugged, enterprise-grade build and a lifetime warranty, ensuring dependable operation and long-term investment protection for critical network infrastructure.

Technical Details of StarTech Cisco QSFP-40G-LR4-S Comp. QSFP+ Module

• Transceiver type: QSFP+ 40GBASE-LR4 optical module
• Data rate: 40 Gbps (4 x 10 Gbps lanes)
• Wavelengths: 1270 nm / 1330 nm (LR4 channel set)
• Fiber type: Single-mode fiber (SMF)
• Reach: Up to 10 km (6.2 miles) on SMF
• Connector: LC duplex
• Diagnostics: Digital Diagnostic Monitoring (DDM) support
• Form factor: QSFP+ (MSA-compliant)
• Compatibility: Cisco QSFP-40G-LR4-S and compatible QSFP+ ports
• Electrical/Environmental: Hot-swappable, designed for data-center environments
• Warranty: Lifetime warranty for continued reliability

How to Install StarTech Cisco QSFP-40G-LR4-S Comp. QSFP+ Module

• Power down the target equipment or follow your organization's hot-swap policy before handling the module.
• Ground yourself to prevent electrostatic discharge (ESD) and handle the transceiver by the edges or its viewing window, avoiding contact with the optical connectors.
• Verify compatibility: ensure the QSFP+ port is designed for 40GBASE-LR4 and that the switch or router supports LR4 transceivers and MSA-compliance.
• Insert the transceiver into the QSFP+ port, aligning the notch and connector properly. Gently push until the module seats and the latches engage with a click.
• Connect the single-mode fiber using LC duplex cables, ensuring clean, dry connections and proper fiber routing to avoid bending or stress on the cables.
• Power up the equipment and monitor the link status. If available, verify DDM readings to confirm healthy transmit/receive power levels and temperature within expected ranges.
• Test the link by generating traffic across the 40G path and verifying throughput, latency, and error rates to confirm stable operation.

Frequently asked questions

• Q: What is the maximum distance supported by this transceiver? A: Up to 10 kilometers on single-mode fiber (SMF), depending on the fiber quality and network hardware.
• Q: Is this transceiver compatible with Cisco devices? A: Yes, it is designed to be Cisco QSFP-40G-LR4-S compatible and also MSAs-compliant, ensuring broad interoperability with QSFP+ ports.
• Q: Does the module support diagnostic monitoring? A: Yes, it includes Digital Diagnostic Monitoring (DDM) for real-time visibility into optical power, temperature, and other critical parameters.
• Q: What type of fiber and connector does it use? A: It uses single-mode fiber with an LC duplex connector, ideal for long-haul and backbone deployments.
• Q: Is there a warranty? A: The transceiver is backed by a lifetime warranty, providing assurance on long-term performance and reliability.