Cisco 400G-LR4 QSFP-DD Transceiver, Duplex LC, 10 km Single-Mode

The Cisco QDD-400G-LR4-S pairs a duplex LC connector with a long reach. The title reads 400G-LR4, and it is a QSFP-DD module with single-mode fiber, an LC duplex connector and a 10 km reach.

This suits links between buildings or sites where duplex single-mode is already pulled. As with all long-reach optics, both ends should be the same type, so list the far-end hardware when you ask for pricing. If this replaces an existing module, send its part number and we will cross-check the two.

A span of 10 km also depends on the quality of the fiber route, including splices and patch panels. The module is a single-port unit. It is available new, refurbished or used. Warranty runs 1 year or 3 years on new and refurbished units and 90 days on used units.