Cisco 40GBASE-CSR4 QSFP+ Module for MMF

Engineered for high-density data center networks, the Cisco 40GBASE-CSR4 QSFP+ Module for MMF delivers robust 40 Gigabit Ethernet performance across multimode fiber. This QSFP+ transceiver consolidates four independent 10GBASE-SR lanes into a single, hot-swappable module, simplifying cabling and maximizing port utilization in Cisco environments. With extended reach on laser-optimized OM3 and OM4 multimode fiber, it creates flexible uplink options for spine-leaf architectures, data-center interconnects, and high-performance server-to-switch connections. Each lane adheres to IEEE 10GBASE-SR specifications, ensuring compatibility, reliability, and predictable performance across supported Cisco switches and routers. Whether upgrading an existing fabric or deploying a new topology, this CSR4 module is designed to deliver consistent 40G throughput while minimizing power and space requirements.

• High-density 40G uplinks: The QSFP+ form factor consolidates four 10G SR lanes into a single port, dramatically increasing uplink capacity without expanding rack space. This makes it ideal for data-center spine and leaf architectures, enabling scalable growth while keeping cabling straightforward and organized.
• Long-reach MMF support (OM3/OM4): Extends link lengths to up to 300 meters on OM3 and up to 400 meters on OM4 laser-optimized multimode fiber. This versatility accommodates mid-range to large data-center deployments, reducing the need for cabling changes as you scale.
• IEEE 10GBASE-SR per lane: Each of the four parallel lanes is compliant with the IEEE 10GBASE-SR standard, providing reliable short-reach performance with 850 nm VCSEL technology. This alignment with established standards simplifies interoperability and troubleshooting across multi-vendor networks.
• MSA-compliant QSFP+ with MPO/MTP connectivity: Designed for standard MTP/MPO fiber cabling used in data centers, offering plug-and-play integration with Cisco switches and compatible devices. The 12-fiber MPO/MTP interface enables clean, organized cabling for high-density deployments.
• Cisco compatibility and reliability: Built to integrate seamlessly with Cisco ecosystems, delivering dependable performance in demanding environments. The module is engineered for hot-swapping in supported hardware, minimizing downtime during upgrades and maintenance.

Technical Details of Cisco 40GBASE-CSR4 QSFP+ Module for MMF

• Form Factor: QSFP+ transceiver module
• Data Rate: 40GBASE-CSR4 (four 10GBASE-SR lanes)
• Optical Type: Multimode Fiber (MMF)
• Fiber Type Support: OM3 and OM4 laser-optimized multimode fiber
• Reach: Up to 300 meters on OM3; up to 400 meters on OM4
• Wavelength: 850 nm VCSEL-based transmissions
• Connector: MPO/MTP interface (12-fiber) for high-density fiber cabling
• Compliance: IEEE 802.3ba 40GBASE-CSR4
• Hot-swappable: Yes — designed for easy insertion and removal in compatible Cisco devices
• Designed for data-center environments: Optimized for reliability, stability, and consistent performance in crowded racks and dense networks

How to install Cisco 40GBASE-CSR4 QSFP+ Module for MMF

• Power down or disable the connected switch port and disconnect power from the device before installation to prevent electrical damage.
• Verify compatibility: confirm that your Cisco switch or router supports CSR4 QSFP+ transceivers and that the firmware is up to date to ensure proper recognition and operation.
• Remove any existing transceiver from the target QSFP+ slot following the device’s maintenance procedure, then align the CSR4 module with the slot and slide it in until it seats firmly with a click.
• Attach the multimode fiber cabling to the MPO/MTP connector, ensuring correct polarity and cleaning connectors prior to connection to maximize signal integrity and minimize insertion loss.
• Power up the device and enable the interface; verify link status with the switch’s command-line interface or management dashboard, and test basic connectivity to confirm 40G data transmission across all four lanes.

Frequently asked questions

• What is the Cisco 40GBASE-CSR4 QSFP+ Module for MMF? It is a four-lane QSFP+ transceiver that enables 40G Ethernet over multimode fiber by combining four 10GBASE-SR lanes into a single 40G link, suitable for short-reach data-center uplinks in Cisco environments.
• What fiber types does it support? It supports laser-optimized multimode fiber, specifically OM3 and OM4, to achieve the stated reach while maintaining signal integrity.
• What are the maximum link lengths? The module supports up to 300 meters on OM3 and up to 400 meters on OM4, making it a flexible solution for varying data-center layouts.
• Is this module compatible with non-Cisco devices? While designed for Cisco ecosystems, CSR4 QSFP+ modules may work in other vendor hardware that supports compatible transceivers; always verify vendor compatibility and firmware requirements before deployment.
• Is the module hot-swappable? Yes. It is designed to be inserted and removed while the system is powered on in many Cisco platforms, but always follow the manufacturer’s guidelines and standards to avoid potential damage.
• Where can I find exact specifications and compatibility details? For precise numbers on power consumption, thermal characteristics, and firmware compatibility, refer to the official specifications on the supplier’s product page (ec.synnex.com) using the product’s UPC or SKU as a reference.