Maintain high-speed backbone connectivity with a QSFP module designed for 100GBASE-P deployments over single-mode fiber. The QSFP-100G-PSM4-ENC gives infrastructure teams a practical replacement path for Arista environments where compatibility, sourcing control, and deployment consistency matter more than marketing claims. This module is positioned for organizations that need to preserve link performance while keeping procurement aligned with TAA requirements. It supports the kind of network buildouts where optics are not interchangeable commodities, but part of a controlled standard across data center fabrics, aggregation layers, and long-reach interconnects. For teams comparing lower-cost optics, the value here is in reducing uncertainty. A functionally identical compatible module helps simplify spares planning, standardize refresh cycles, and keep critical links moving without introducing unnecessary variance into the hardware stack. It is a straightforward fit for environments that expect disciplined sourcing and repeatable results.