AddOn QSFP-40G-ER4-AO 40GBASE-ER4 QSFP+ | Cisco Compatible, TAA — QSFP-40G-ER4-AO

Keep long-distance 40 GbE links stable with a QSFP+ transceiver designed for 40GBASE-ER4 deployments over single-mode fiber. This AddOn module delivers up to 40 km reach using an LC connector and a 1,270 nm to 1,330 nm wavelength range, making it a strong fit for campus interconnects, metro aggregation, and other fiber runs where reach matters more than port density. Built as a Cisco-compatible alternative, the module is programmed, uniquely serialized, and tested for data traffic and application behavior so it initializes and performs as expected in supported environments. TAA compliance helps simplify public-sector and regulated procurement, while the hot-swappable form factor supports maintenance without extended downtime. For teams standardizing on 40 GbE optics, this module offers the reach, compatibility, and procurement alignment needed to justify a higher-grade transceiver over short-reach alternatives. Ideal For Connect data center buildings across long single-mode fiber runs Support campus backbone links where 40 km reach is required Deploy in regulated environments that require TAA-compliant sourcing Replace OEM optics in Cisco-compatible 40 GbE infrastructure Why This Product 1 Longer reach than short-range 40G optics 2 TAA compliance for public-sector procurement 3 Cisco-compatible alternative with tested initialization 4 40 km single-mode reach for inter-building links