Juniper QSFPP-40GBASE-LR4 QSFP+ 40GBASE LR4 Module | QSFP+ Optics Enterprise

Maintain 40 GbE links across longer distances without moving to a different optics class. Juniper’s QSFPP-40GBASE-LR4 QSFP+ module is designed for single-mode fiber deployments where reach, signal integrity, and predictable interoperability matter. It fits the role of a backbone or aggregation optic, carrying 40 Gigabit Ethernet traffic over LC duplex infrastructure with the optical budget expected for enterprise switching environments. For teams standardizing on Juniper switching, LR4 optics help preserve design consistency across campus uplinks, data center leaf-spine extensions, and inter-building runs. The QSFP+ form factor keeps density high while supporting the link performance needed for production traffic. Compared with shorter-reach optics, LR4 gives you more placement flexibility and fewer compromises when switch locations are fixed by rack layout, power, or cabling constraints. This module is a practical choice when the cost of a failed link is higher than the cost of the optic itself. It is built for environments where procurement wants a known-good part number, engineering wants predictable behavior, and operations wants fewer surprises during deployment.