The 40GBASE-CSR4 QSFP+ Optical Transceiver Module is designed for 40 Gigabit Ethernet (40GbE) applications over multimode fiber. ● Certified and tested on Cisco QSFP 40G ports for superior performance, quality, and reliability ● High-speed electrical interface compliant to the IEEE 802. This transceiver is compliant with QSFP+ MSA, IEEE 802. The. The Cisco 40GBASE QSFP (Quad Small Form-Factor Pluggable) portfolio offers customers a wide variety of high-density and low-power 40 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, and service provider. h 40 Gigabit Ethernet connectivity. Designed to operate over multimode fiber (MMF), it supports transmission distances of up to 300 meters on OM3 and 400 meters on OM fiber using MTP/MPO-12 connectors.