Build dense 40 GbE links where short-reach multimode fiber is the right fit. This AddOn-compatible QSFP+ SR4 transceiver delivers 40GBase-SR4 throughput over MPO connectivity, supporting up to 150 m on multimode fiber at 850 nm. It is designed for Arista-compatible deployments that need predictable interoperability without changing the network design. The module is hot-swappable, which helps reduce service disruption during upgrades or replacements. DOM support is included for optical visibility, giving operations teams the data they need to validate link health and troubleshoot before a marginal signal becomes an outage. For environments that buy against strict sourcing rules, TAA compliance keeps procurement aligned with policy. This is a practical choice for top-of-rack, aggregation, and leaf-spine links where 40 GbE density matters. It gives infrastructure teams a verified optics path for short-reach switching while preserving the compatibility and consistency expected in enterprise networks.