The Cisco QSFP-100G-LR4-S is designed for Cisco 100G QSFP ports and supports IEEE 100GBASE-LR4 over single-mode fiber. It is tested on compatible Cisco platforms such as Nexus 9000, Nexus 3000, Catalyst 9500, ASR 9000, and select NCS systems. Always confirm your exact switch or router model before ordering.