Description
Cisco QSFP-40G-CSR-S: Duplex MMF 40GBASE QSFP+ Transceiver
The Cisco QSFP-40G-CSR-S (S-Class) is a high-density, pluggable optical transceiver engineered for reliable 40 Gigabit Ethernet links over multimode fiber. This QSFP+ module features a duplex LC connector interface and is optimized for laser-graded OM3 and OM4 multi-mode fiber, delivering robust performance in modern data centers. With support for demanding uplink and inter-switch connections, the CSR-S is a trusted choice for spine-and-leaf deployments, cloud environments, and campus networks that require scalable, low-latency connectivity. Whether you’re upgrading a data center rack or expanding a campus network, the CSR-S helps maximize port density while maintaining Cisco-grade reliability and interoperability within Cisco ecosystems.
- High-density 40GBASE-CSR-S transceiver for scalable data-center connectivity in a compact QSFP+ form factor. Optimized for dense switch-to-switch links, rack-space efficiency, and simplified cable management in modern networks. This module enables large-scale bandwidth without sacrificing port availability or space.
- Duplex MMF LC interface with standard LC connectors supports straightforward, reliable fiber cabling. The duplex interface enables bi-directional 40G transmission over a single fiber pair, reducing patch panel complexity and enabling flexible fiber routing in crowded data-center environments.
- OM3 and OM4 fiber compatibility with extended reach—up to 300 meters on laser-optimized OM3 and up to 400 meters on OM4. This makes the CSR-S suitable for a range of deployments, from intra-rack uplinks to cross-room connections, while preserving high signal integrity and margin over typical data-center fiber layouts.
- QSFP+ S-Class compatibility—designed for Cisco systems to ensure seamless integration, predictable performance, and long-term reliability in enterprise and service-provider networks. Cisco-grade components and testing help reduce interoperability risk across Cisco switches, routers, and optics ecosystems.
- Hot-swappable, plug-and-play operation—engineered for rapid deployment with minimal system downtime. The module supports straightforward hot-swapping in compatible Cisco devices, with clear optical and status indicators to help operators verify healthy links quickly during upgrades or maintenance windows.
Technical Details of Cisco QSFP-40G-CSR-S
- Get this information from the "specifications" section of the product from https://ec.synnex.com/ using product "UPC" or "SKU" as reference
How to install Cisco QSFP-40G-CSR-S
- Prepare the equipment — power down the device if required by your deployment protocol and ensure the target QSFP+ port is available for installation. Confirm compatibility with your Cisco switch or router model and verify that the module supports your intended fiber type and distance.
- Insert the module — align the CSR-S with the QSFP+ port and insert firmly until it seats with an audible or tactile click. Confirm that the module is fully engaged and that the port LED indicators reflect normal activity after seating.
- Connect the fiber — attach duplex multimode fiber to the LC connectors, ensuring the correct OM3 or OM4 fiber is used for the desired link distance. Use quality fiber patch cords and maintain proper bend radii to preserve optical performance.
- Power on and verify — restore power and use your device’s CLI or GUI to verify the interface detects the transceiver. Commands such as show interface status or equivalent optics diagnostics can confirm the link is up and operating at 40G speeds.
- Test the link — perform basic throughput and latency tests to validate the link under expected traffic conditions. Monitor the optics health and LED indicators over the initial hours of operation to ensure stable performance.
Frequently asked questions
- What is the Cisco QSFP-40G-CSR-S? It is a 40GBASE CSR-S (short-reach) QSFP+ transceiver designed for duplex multimode fiber with an LC interface, specifically optimized for Cisco networking equipment and data-center environments.
- What fiber types does it support? It supports laser-optimized multimode fiber (OM3 and OM4), enabling reliable 40G connections over these common data-center fiber types.
- What link distances are supported? For OM3 fiber, up to 300 meters; for OM4 fiber, up to 400 meters, depending on link quality and optical budget.
- Is it hot-swappable? Yes. The CSR-S is designed as a hot-swappable QSFP+ module, allowing deployment and upgrades without powering down the host equipment in compatible Cisco devices.
- Is it compatible with non-Cisco devices? The module is designed for Cisco systems and is tested for Cisco interoperability. While some non-Cisco devices may recognize the module, full compatibility cannot be guaranteed across all vendors; always consult your vendor’s compatibility matrix before mixed-vendor deployments.
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