Cisco Systems, Inc. QSFP-40G-LR4-S= 40GBase-LR4 10km server accessory

Cisco 40GBase-LR4 QSFP module for 10 km

This Cisco QSFP-40G-LR4-S= transceiver delivers 40GBase Ethernet over a standard pair of G.652 single-mode fibers up to 10 kilometer. It uses duplex LC connectors and carries the signal on four wavelengths with on-board multiplexing and demultiplexing. The module supports the 40GBase rate only and is built for long-reach server and data-centre interconnects. It suits network engineers who need reliable 40 Gigabit links between buildings or across campus fibre plant.

Duplex LC connector and integrated wavelength

The accessory ships with a duplex LC interface so it plugs directly into compatible QSFP+ ports without extra cabling kits. Multiplexing and demultiplexing of the four wavelengths are handled inside the module, removing the need for external mux or demux hardware. This simplifies patch-panel layout and reduces insertion-loss points on the 10 kilometer path. Installers gain a single-component solution for 40GBase-LR4 deployment.

Check QSFP+ port compatibility

Before ordering, confirm that your switch or router line card accepts QSFP+ modules and is qualified for 40GBase-LR4 operation. Verify that the installed fibre plant is G.652 single-mode with duplex LC terminations and that the link budget covers the 10 kilometer distance. Ensure the host firmware supports this part number so the transceiver initialises correctly on power-up.