Network transceiver module Cisco QSFP-40G-SR4-S

The Cisco QSFP-40G-SR4-S is a 40GBASE-SR4 QSFP fiber optic transceiver designed for short-reach, high-bandwidth links over multimode fiber. It operates at 850 nm with a maximum data rate of 40,000 Mbit/s and supports parallel 12-fiber MPO/MTP connections, providing interoperability with IEEE-compliant 40GBase-SR4 modules.

Advantages

The module supports link lengths of up to 100 meters on OM3 and 150 meters on OM4 multimode fiber, offers a QSFP form factor for compact port density, and is MSA-certified for broad compatibility in data center and enterprise network environments. Its parallel MPO/MTP termination simplifies cabling for 40G links.

Suitable for

• High-speed data center uplinks and aggregation
• 40G interconnects between switches and routers
• Enterprise backbone connections over multimode fiber
• Short-reach parallel optical links using MPO/MTP

Key specifications

• Model: Cisco QSFP-40G-SR4-S
• Data rate: 40,000 Mbit/s
• Wavelength: 850 nm
• Fiber type: Multimode (OM3 / OM4)
• Maximum reach: 100 m (OM3), 150 m (OM4)
• Connector: MPO/MTP (12-fiber parallel)
• Form factor: QSFP
• Certification: MSA compliant, IEEE interoperability

How to use

Install the QSFP-40G-SR4-S into a compatible QSFP slot on a switch or router, and connect the 12-fiber MPO/MTP patch cable to the module. Ensure the fiber type (OM3 or OM4) matches the desired link distance and that cable polarity is correct for parallel 40GBase-SR4 operation. Verify link status and speed via the host device's interface after physical installation.

Recommendations

Use OM4 fiber when longer reach (up to 150 m) is required and follow manufacturer guidelines for MPO/MTP cleaning and handling to maintain optical performance. Confirm host device firmware and compatibility for IEEE-compliant 40GBase-SR4 modules before deployment.