StarTech.com Dell EMC 3CSFP91 Compatible QSFP+ Module, 40GBASE-ER4, Single Mode (SMF) Fiber, 40GE Gigabit Ethernet QSFP+, LC 40 km, 1270nm to 1330nm, DDM, 40GbE QSFP+ Active Optical Cable - Lifetime Warranty (QSFP40GER4ES) - QSFP+ transceiver module (equivalent to: Dell EMC QSFP-40G-ER4) - 40 Gigabit LAN - 40GBase-ER4Q - LC single-mode - up to 40 km - 1311 nm

The QSFP40GER4ES is a Cisco QSFP-40G-SR4-S compatible fiber transceiver module that has been designed, programmed and tested to work with Cisco brand switches and routers. It delivers dependable 40 GbE connectivity over fiber cable, for 40GBase-SR4 compliant networks, with a maximum distance of up to 40 km (24.8 mi). This QSFP+ fiber module is hot-swappable, making upgrades and replacements seamless by minimizing network disruptions. StarTech.com offers a wide variety of SFP modules and direct-attach SFP cables, providing the convenience and reliability you need to ensure dependable network performance.