Lenovo 40GBASE-eSR4 QSFP+ Transceiver

A QSFP+ transceiver is a four-lane pluggable module, and 40GBASE-eSR4 is the Ethernet standard this one is built for. The Lenovo 00FE325 fits a QSFP+ port on a switch or adapter and carries 40Gb Ethernet over fiber.

The connector is QSFP+ and the Lenovo feature code is A5U9; confirm reach, media type and host compatibility before ordering. Before ordering, confirm the cabling on both ends and check that the host port accepts third-party-listed Lenovo optics; we are happy to cross-check your switch and adapter models if you send them.

For buyers, the practical point is simple: a transceiver has to match the standard at both ends of a link. The eSR4 designation is the one to look for in your existing cabling plan.

The 00FE325 is available new, refurbished or used. New and refurbished units carry a choice of 1 year or 3 years of warranty, and used units carry 90 days.