Cisco QSFP-40G-SR4 QSFP+ Module

The Cisco QSFP-40G-SR4 QSFP+ Module is a high-density, plug-and-play solution designed for rapid deployment of 40 Gigabit Ethernet in modern data centers, high-performance computing environments, and wide-reaching enterprise networks. Built for scalability, this 40GBASE QSFP+ module delivers four parallel 10 Gigabit Ethernet lanes in a single form factor, enabling seamless upgrades from legacy 10G networks to a future-proof 40G fabric. With its robust Cisco engineering, the QSFP-40G-SR4 is optimized for reliability, ease of installation, and compatibility across Cisco switching and routing platforms, making it a trusted choice for core and distribution layers, service provider transport, and dense top-of-rack deployments.

• High-density 40GBASE connectivity: A single QSFP+ module packs four 10G lanes into one compact interface, delivering 40 Gbps of aggregate bandwidth suitable for data center spine-leaf architectures, HPC clusters, and backbone links.
• Parallel optics with MTP/MPO interface: Uses a 12-fiber MPO/MTP connector to support four 10G channels in parallel, enabling efficient fiber cabling in tight spaces and reducing the number of required optical links in high-port-count environments.
• Short-range multimode support: Designed for short-reach connections over multimode fiber (MMF). Optimized for OM3 and OM4 fiber types, enabling cost-effective upgrades for data center deployments while maintaining low latency and minimized dispersion across the link.
• Hot-swappable and Cisco-certified: Engineered for quick insertions and removals in compatible Cisco devices, minimizing downtime during maintenance and replacements. Backed by Cisco’s reliability and ecosystem support for broad interoperability with Nexus and Catalyst platforms.
• Versatile deployment across networks: Ideal for data centers, enterprise core/distribution layers, service provider transport, and HPC networks that require scalable, high-bandwidth interconnects with proven performance and compatibility.

Technical Details of Cisco QSFP-40G-SR4 QSFP+ Module

• Form Factor: QSFP+
• Standards/Protocol: 40GBASE-SR4 (Quad Small Form‑Factor Pluggable Plus)
• Data Rate: 40 Gbps aggregate (4 × 10 Gbps lanes)
• Fiber Type: Multimode fiber (MMF) – optimized for OM3 and OM4
• Connector: MTP/MPO 12-fiber interface for parallel optics
• Wavelength: 850 nm VCSEL transmission
• Link Distance: Up to 100 meters on OM3 MMF; up to 150 meters on OM4 MMF
• Power and Thermal: Designed for Cisco data-center environments with efficient thermal performance and hot-swappable operation
• Compatibility: Works with Cisco Nexus and Catalyst switches/routers that provide QSFP+ ports; certified for interoperability within Cisco ecosystems
• Hot-Swappable: Yes, allowing maintenance and upgrades with minimal downtime on compatible devices
• Operating Conditions: Typical data-center operating temperatures with standard compliance for enterprise-grade optics

How to Install Cisco QSFP-40G-SR4 QSFP+ Module

Installing the Cisco QSFP-40G-SR4 QSFP+ module is straightforward in compatible Cisco hardware. Follow these general steps to ensure a secure, reliable connection:

• Confirm compatibility: Verify that your switch or router has QSFP+ ports and supports 40GBASE-SR4 modules. Check your device’s data sheet or Cisco interoperability matrix for the exact model support and firmware requirements.
• Power considerations: In many Cisco devices, QSFP+ modules are hot-swappable. If your equipment requires maintenance mode, follow your vendor’s guidelines. In most cases, you can insert or replace the module with the system powered on, but always consult your device’s documentation before proceeding.
• Remove dust and insert: Remove the dust cap from the QSFP+ slot and the module, align the module with the connector, and gently slide it into the slot until it seats firmly. Ensure there is no undue force and that the module’s notch aligns with the chassis guiderails.
• Secure and verify: If your device uses latching or screw-down retention, engage the mechanism to secure the module. Verify that the link LEDs indicate a healthy connection, and run a basic connectivity test (see below) to confirm 40G operation.
• Connect the fiber properly: Attach the MMF cable with an MTP/MPO 12-fiber trunk, ensuring correct orientation and polarity for transmit and receive paths. Use appropriate fiber routing to minimize bend radius and keep cabling organized for maintenance and airflow.

Frequently asked questions

• What is the Cisco QSFP-40G-SR4 QSFP+ Module? It is a hot-pluggable transceiver that enables 40 Gigabit Ethernet links using four parallel 10G lanes in a single QSFP+ package, designed for data centers and scalable networks.
• What kind of fiber does it use? The module supports multimode fiber, optimized for OM3 and OM4, with a 12-fiber MPO/MTP connector for parallel optics.
• What distance can I run with this module? Typical maximum reach is up to 100 meters on OM3 MMF and up to 150 meters on OM4 MMF, depending on fiber quality and channel budget.
• Is this module hot-swappable? Yes. It is designed to be hot-swapped in compatible Cisco devices, which minimizes downtime during maintenance or upgrades.
• Which devices support this module? It is broadly compatible with Cisco Nexus and Catalyst switches/routers that offer QSFP+ ports and support 40GBASE-SR4 optics; always verify compatibility with your device’s firmware and Cisco’s interoperability guides.
• How do I test the link after installation? Use your device’s diagnostic tools to check port status, link status, and throughput. You can run a short latency and throughput test across the link to confirm 40G performance and verify no errors on the connection.
• Can I mix this module with other 40GBASE-SR4 modules? In most cases, this module follows the 40G-SR4 standard and should be interoperable with other SR4-compliant devices, but always verify with device firmware and optics compatibility matrices to avoid any issues.