Move 100 GbE traffic across longer fiber spans with an optic built for backbone-grade connectivity. The ALCATEL AL-QSFP-100G-LR4 compatible module uses a QSFP28 interface and LC connectivity to support single-mode deployments where reach and signal integrity matter more than raw port count. LR4 optics are a strong fit for aggregation layers, campus interconnects, and data center backbone links that need dependable 100G transport over single-mode fiber. Compared with short-reach multimode options, this class of transceiver is better aligned to longer runs and structured cabling environments where LC termination is already standard. For infrastructure teams, the value is in preserving 100 GbE performance while extending the usable distance of the link. That makes it a practical choice for network designs that bridge rows, rooms, or buildings without stepping up to a different transport architecture. When the requirement is stable 100G connectivity over longer distances, LR4 remains a disciplined, cost-aware answer.