Extreme Networks QSFP+ 40GBASE-LM4 Optical Transceiver — 40 Gbps Single-Mode LC Duplex Module for Long-Reach Data Center Links

Engineered for high-density optical networks, the Extreme Networks QSFP+ Module delivers robust 40GBASE-LM4 performance designed for data centers and enterprise backbones. This single-mode, LC-connected transceiver enables reliable 40 Gbps uplinks between switches, routers, and core devices, supporting modern spine-leaf architectures and cloud-scale services. Built to withstand demanding environments, it combines proven optical technology with a compact QSFP+ form factor to maximize port density while ensuring dependable performance across long-distance links.

• 40 Gbps performance in a compact QSFP+ form factor — This module leverages 4×10 Gbps lanes to deliver up to 40 Gbps aggregate throughput, enabling high-density uplinks that support modern data-center workloads, virtualization, and high-performance computing. Its design minimizes latency and preserves clean signal integrity across dense topologies, helping to maintain predictable application performance in multi-tier networks.
• Single-mode fiber with LC duplex interface — Optimized for longer-distance connections and backbone networks, the LC duplex connectors provide secure, low-loss attachments suitable for campus-to-data-center runs and WAN aggregation. The single-mode fiber supports stable signal transmission over extended distances, reducing the need for frequent re-cabling and enabling cost-effective, scalable infrastructure.
• Hot-swappable, plug-and-play installation — The transceiver is designed for operational efficiency in fast-paced data-center environments. With hot-swappable capability on compatible Extreme Networks devices, you can upgrade or replace modules with minimal downtime. Clear LED indicators on the device help operators quickly verify link status, activity, and health, accelerating maintenance and refresh cycles.
• Robust, enterprise-grade reliability — Built to endure the rigors of continuous data-center operation, the module features precision engineering, high-quality materials, and rigorous testing to withstand temperature variations, vibration, and electrical transients. This reliability translates into reduced maintenance, lower total cost of ownership, and dependable performance for mission-critical applications.
• Broad compatibility and scalable uplinks — Designed to integrate seamlessly with Extreme Networks hardware and other 40GBASE-LM4 deployments, this module supports scalable uplinks as your network grows. It enables cost-efficient upgrades to higher-bandwidth cores and interconnects, making it an ideal choice for expanding data-center fabrics, edge deployments, or large-scale campus networks.

Technical Details of Extreme Networks QSFP+ Module

• Product type: QSFP+ optical transceiver module
• Standard: 40GBASE-LM4
• Data rate: Up to 40 Gbps
• Fiber type: Single-mode optical fiber
• Connector: LC duplex
• Interface: QSFP+ form factor
• Wavelength: 1310 nm (typical for LM4-based implementations)
• Application: Optical network, data networking, uplinks between switches/routers
• Package: 1 x QSFP+ module

how to install Extreme Networks QSFP+ Module

Installing the Extreme Networks QSFP+ Module is designed to be straightforward and quick, maximizing uptime and reducing maintenance windows. Follow these best-practice steps to ensure a secure and reliable deployment:

• Power considerations: In supported devices, QSFP+ modules are typically hot-swappable. Confirm your specific equipment’s guidelines and ensure the system is in a ready state for a module replacement or upgrade.
• Prepare the existing environment: If you are upgrading, remove the existing QSFP+ module from the target port only after confirming that the new module is compatible and the link-compatibility matrix supports the swap.
• Insert the module: Align the QSFP+ module with the slot and gently slide it in until it seats firmly. A tactile click or a soft resistance indicates proper engagement in the backplane. Do not force the module.
• Attach fiber cables: Connect the LC duplex fiber cables to the corresponding TX and RX ports, observing any color-coding or labeling that denotes transmit (Tx) and receive (Rx). Ensure the connectors are clean and free of dust to prevent signal loss.
• Secure and test: After installation, secure all cabling and verify that link LEDs indicate a healthy connection. Use your device’s management interface or CLI to confirm the 40G interface status and perform basic throughput tests to validate performance.
• Configuration considerations: Depending on your network design, enable the 40G interface in your switch or router, apply any required VLANs, LACP, QoS, or routing policies, and validate end-to-end connectivity with representative traffic patterns.

Frequently asked questions

• Q: What is the main purpose of the Extreme Networks QSFP+ Module? A: It provides high-speed 40 Gbps uplinks over single-mode fiber, suitable for data-center interconnects, core-to-distribution links, and scalable backbone networks.
• Q: Is this module hot-swappable? A: Yes, the module is designed for hot-swapping on compatible Extreme Networks devices, enabling minimal downtime during upgrades or replacements.
• Q: What type of fiber and connector does it use? A: It uses single-mode optical fiber with LC duplex connectors, optimized for longer-distance network links and backbone deployments.
• Q: Can I use this module with non-Extreme Networks equipment? A: The module is designed for compatibility with devices that support 40GBASE-LM4 and QSFP+ form factors; always verify vendor compatibility and interop guidelines before deployment in mixed environments.
• Q: How do I verify the performance after installation? A: Check the link status on the device’s management interface, run a baseline throughput test, and monitor for any error rates or latency variations. Ensure the interface is configured for 40G and that QoS and VLAN settings align with your network design.