Refurb Squared
Cisco QSFP-40G-SR4-S Compatible 40GBASE-SR4 QSFP+ 850nm 150m DOM MPO-12/UPC MMF Optical Transceiver Module
Cisco QSFP-40G-SR4-S Compatible 40GBASE-SR4 QSFP+ 850nm 150m DOM MPO-12/UPC MMF Optical Transceiver Module
ISO 14001:2015
ISO 45001:2018
ISO 9001:2015
The QSFP+ module adopts 12 Fibers MTP/MPO Male connectors, reaching a link up to 150m over OM4 MMF (100m over OM3). This transceiver is compliant with IEEE 802.3 40GBASE-SR4 standard. At the same time, it is completely interoperable with all standard 40GBASE-SR4 interfaces. Digital diagnostics functions are also available via the I2C interface, as specified by the QSFP+ MSA, to allow access to real-time operating parameters. With its easy installation and hot-swappable design, this transceiver is ideal for various applications, including campus, data center, cloud deployments, high-performance computing environments, and interconnections between switches, routers, servers, and transport equipment. Because the QSFP-SR4-40G does not support 4x10G breakout connectivity, see QSFP-4×10G-SR for such applications.
Enterprise Grade Performance
Enterprise Grade Performance
Our networking cables and optical transceivers are designed for high-performance enterprise networks. They support fast data transmission, stable connectivity, and consistent signal strength across switches, servers, and routers.
Wide Device Compatibility
Wide Device Compatibility
These modules are engineered to work with many leading networking brands such as Cisco, Juniper, Arista, and other enterprise systems. They integrate easily into existing network infrastructure.
Simple Plug And Play Setup
Simple Plug And Play Setup
Installation is quick and easy. Simply insert the cable or transceiver into the compatible port and it begins operating immediately without complicated configuration.
Reliable Connection Stability
Tested And Verified Products
Affordable Enterprise Pricing

Competitive Pricing
Refurb Squared networking hardware delivers high-speed connectivity using tested optical modules and enterprise-grade cables built for reliability and seamless device compatibility.
Built For Reliable Networking
At Refurb Squared we provide high-quality networking hardware trusted by engineers and IT professionals. Our mission is to deliver reliable technology at affordable prices.





