The Arista XVR-10068-21 QSFP transceiver implements 100GBASE-LR4 in a QSFP28 package, delivering up to 100 Gbps over duplex single‑mode fiber for distances up to 10 km. It uses four 25 Gb/s lanes (4×25G) with a 1310 nm optical transmitter to achieve a true LR4 link, and is designed for LR4‑compliant, single‑mode fiber deployments. Commonly installed in QSFP28 100G ports on Arista data‑center switches to connect distant endpoints, it is referenced in Arista’s transceiver guides and LR4 specifications as a standard 100G LR4 module.
