Build 40 GbE uplinks over parallel single-mode fiber with a 40GBASE-PLR4 QSFP+ transceiver built for long-reach optical connections. The PLR4 interface carries four 10 GbE lanes over MPO/MTP fiber, supporting a 40 GbE aggregate link across distances up to 10 km. Its QSFP+ form factor fits network equipment that accepts 40GBASE-PLR4 optics. AddOn 3HE11241AA-AO is coded for use with Alcatel-Lucent Nokia equipment. This makes it suitable for replacing a required compatible optic in a switch, router, or transport platform where the port calls for a 40GBASE-PLR4 QSFP+ module. The TAA-compliant designation supports deployments that require products meeting Trade Agreements Act sourcing requirements. Unlike short-reach 40 GbE parallel optics intended for multimode cabling within a room or row, this PLR4 module is intended for single-mode fiber paths extending between equipment rooms, buildings, or distant network aggregation points. Confirm that the installed port supports 40GBASE-PLR4 operation and that the fiber plant provides the required parallel MPO/MTP single-mode connection before deployment.