Provide a 100 Gigabit Ethernet optical uplink for compatible Alcatel-Lucent Nokia equipment with a QSFP28 transceiver built for the 100GBASE-LR4 interface. LR4 carries four optical lanes over single-mode fiber and presents a duplex LC connection, making it suited to interconnects between network racks, aggregation equipment, and distribution locations where copper cabling is not appropriate. The QSFP28 form factor fits 100 GbE interfaces that accept LR4 optical modules. It provides an optical alternative to direct-attach copper for longer structured-fiber runs and preserves the 100GBASE-LR4 signaling expected by the host port. Match the host interface, required optical standard, fiber type, and connector format before installation. AddOn 3HE10550AA-20-AO is specified as compatible with the Alcatel-Lucent Nokia 3HE10550AA-20 optic and is TAA compliant. Its distinguishing characteristics are the 100 GbE LR4 optical interface, QSFP28 host format, and single-mode duplex LC fiber connection. Use it where the network design calls specifically for a 100GBASE-LR4 optical link rather than a lower-speed Ethernet optic or a copper interconnect.