The Cisco 40GBASE-LR4 QSFP module supports link lengths of up to 10 kilometer over a standard pair of G.652 single-mode fiber with duplex LC connectors. The QSFP-40G-LR4-S module supports 40GBASE Ethernet rate only. The 40 Gigabit Ethernet signal is carried over four wavelengths. Multiplexing and demultiplexing of the four wavelengths are managed in the device. QSFP-40G-LR4-S does not support FCoE.

• QSFP+ is the single answer to all your desired and specified application execution needs
• 40GBase-LR4 network technology for reliable connectivity with maximum productivity
• 40Gigabit Ethernet - Designed to provide high-performance Ethernet connection while minimizing power and CPU cycles' utilization
• Optical fiber cable compatible - Spans afar and provides speedy data transmission rates between servers and network components
• Single-mode fiber mode support for feasible connectivity with added productivity
• Plug-in Module conveniently adds a specific feature to an existing computer program to ensure maximum productivity
• QSFP+ with optical network application/usage for reliability and maximum efficiency