StarTech Cisco QSFP-40G-SR4-S Compatible QSFP+ Module – 40GBASE-SR4 MMF Transceiver

Experience scalable, high-density 40 Gigabit Ethernet connectivity with the StarTech.com Cisco QSFP-40G-SR4-S Compatible QSFP+ Module. Designed to deliver reliable 40GbE performance over multimode fiber, this QSFP+ transceiver is a drop-in, Cisco QSFP-40G-SR4-S compatible solution that blends StarTech’s engineering rigor with Cisco-friendly interoperability. Ideal for data centers, enterprise cores, and HPC environments, it enables fast uplinks, simplified cabling, and straightforward upgrades while preserving investment protection through a lifetime warranty.

• 40GBASE-SR4 performance for high-density networks: This QSFP+ module supports 40 Gbps Ethernet using four parallel 10 Gbps channels across multimode fiber, delivering dense uplinks and streamlined cabling for spine-leaf data center architectures and large server-to-switch deployments.
• 850 nm MMF transceiver for optimized short-reach links: Engineered for multimode fiber, the SR4 transceiver operates at 850 nm and provides reliable operation up to 100 meters on standard MMF installations, making it ideal for rack-to-rack, cabinet-to-cabinet, and top-of-rack connections.
• MPO/MTP connector with DDM for easy health monitoring: Equipped with a robust MPO/MTP fiber interface, it supports efficient fiber routing and features Digital Diagnostics Monitoring (DDM) to observe optical power, temperature, supply voltages, and other key metrics in real time.
• MSA compliant and hot-swappable for flexible deployments: Fully compliant with the Multi-Source Agreement (MSA) standard and designed for hot-swappable installation, enabling maintenance and upgrades with minimal downtime in modern networks.
• Lifetime warranty and trusted support: Backed by StarTech’s lifetime warranty, this module offers long-term reliability and access to technical support, ensuring consistent performance and investment protection in demanding environments.

Technical Details of StarTech.com Cisco QSFP-40G-SR4-S Compatible QSFP+ Module

• Product type: QSFP+ transceiver module
• Data rate: 40GBASE-SR4 (40 Gbps)
• Media: Multimode fiber (MMF)
• Wavelength: 850 nm
• Fiber distance: Up to 100 m (328 ft)
• Connector: MPO/MTP
• DDM (Digital Diagnostics Monitoring): Yes
• MSA compliance: Yes
• Hot-swappable: Yes
• Compatibility: Cisco QSFP-40G-SR4-S and other QSFP+ ports
• Warranty: Lifetime

How to install StarTech.com Cisco QSFP-40G-SR4-S Compatible QSFP+ Module

• Power considerations: Verify your switch or router supports hot-swapping or power down the chassis prior to installation according to vendor guidelines. If the device supports hot-swapping for QSFP+ modules, you may install without shutting down, but always follow your equipment’s instructions.
• Prepare the fiber: Use appropriate multimode fiber (OM3/OM4 recommended) with an MPO/MTP fan-out or trunk cable. Confirm the fiber polarity and ensure the ends are clean and ready for connection to minimize insertion loss.
• Insert the transceiver: Power down (if required) and align the QSFP+ module with the port. Gently insert the module into the QSFP+ slot until it seats securely and the latches click into place.
• Connect fiber cables: Attach the MPO/MTP fiber assembly to the transceiver’s MPO/MTP connector, ensuring correct transmit/receive orientation. Route cables neatly to prevent strain or bend radius violations.
• Terminate the other end: On the opposite side, terminate the fiber with the matching MPO/MTP assembly and ensure compatibility with the switch’s SFP+/QSFP+ uplink configuration and port settings.
• Power up and verify: If power-down was performed, power the device back on. Check port status indicators and use the switch’s management interface to confirm link is established at 40G and to monitor DDM metrics for optical health.
• Validation and monitoring: Run basic connectivity tests and, if available, perform a loopback or throughput test. Use DDM data to verify optical budget, temperature, and voltage readings for proactive maintenance.

Frequently asked questions

• Q: Is this module compatible with Cisco QSFP-40G-SR4-S ports? A: Yes. It is designed to be Cisco QSFP-40G-SR4-S compatible, providing seamless interoperability with Cisco QSFP+ 40 GbE ports while maintaining StarTech’s quality and warranty.
• Q: What fiber type does it require? A: Multimode fiber (MMF) is required, with 850 nm SR4 optics. For best results, use OM3 or OM4 fiber and follow appropriate MPO/MTP termination practices.
• Q: What is the maximum reach? A: Up to 100 meters (328 feet) on standard MMF installations, depending on fiber specification, quality, and connector integrity.
• Q: Does it support Digital Diagnostics Monitoring (DDM)? A: Yes. The transceiver includes DDM to monitor optical power, temperature, and other operational parameters for proactive health checks.
• Q: Can this module be hot-swapped? A: Yes. It is designed for hot-swappable installation, allowing maintenance without powering down compatible equipment, in line with vendor guidelines and the device’s specifications.
• Q: What warranty coverage is provided? A: The module is backed by a lifetime warranty from StarTech, offering long-term protection and access to technical support if issues arise.
• Q: Is this a Cisco-branded module? A: No. This is a StarTech module designed to be compatible with Cisco QSFP-40G-SR4-S ports, delivering Cisco-compatible performance with StarTech’s warranty and support guarantees.
• Q: What installation considerations should I keep in mind? A: Follow proper cable management, ensure correct polarity, avoid excessive bending of MMF cables, and verify port configurations on your switch to enable 40G operation and avoid negotiation issues.