QSFP-DD800 short-reach module providing two independent 400G VR4 links over multimode fiber up to 50 m (OM4). Designed for 800G ports operating in 2x400G breakout within high-density leaf/spine rows and TOR aggregation. Uses 850 nm VCSEL-based parallel optics with dual MPO-12 connectors; host-side FEC required. Supports DOM and interoperates with MSA-compliant 400GBASE-VR4 ports using MPO-12.

- 2x400G short-reach links from a single QSFP-DD800 module
- VR4 parallel optics optimized for MMF in dense racks
- Dual MPO-12 interfaces for streamlined cabling
- DOM support for visibility into optical performance
- KP4 FEC compatibility for stable 400G PAM4 links
- Ideal for TOR-to-spine or spine-to-spine short runs

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.