Cisco QSFP-400G-DR4-S 400GBase-DR4 Single-Mode Transceiver

The Cisco QSFP-400G-DR4-S is a 400GBase-DR4 single-mode fiber transceiver engineered for high-density, long-reach interconnects in next-generation data center architectures. This module delivers 400 Gbps aggregate throughput over four parallel 100 Gbps lanes, utilizing wavelength-division multiplexing (WDM) across C-band wavelengths to enable transmission over standard single-mode fiber (SMF-28 compatible) cabling at distances up to 500 meters.

Designed for top-of-rack (ToR) to spine switch connections in large-scale AI and machine learning infrastructure environments, the DR4-S variant provides superior reach compared to shorter-distance 400G options while maintaining cost efficiency in hyperscale deployments. The module integrates comprehensive monitoring and diagnostic capabilities via Digital Optical Monitoring (DOM) for real-time optical performance tracking and predictive maintenance.

As a pluggable small form factor transceiver adhering to the QSFP-DD form factor specification, it enables modular, field-replaceable deployment in next-generation switching platforms without requiring fixed-port optical architectures, supporting rapid fabric expansion and technology refresh cycles.

Ideal for

• AI/ML training cluster spine-to-leaf fabric interconnects requiring 400G+ throughput with 500m reach
• High-performance computing (HPC) center multi-tier switching fabric deployments
• Large-scale data center spine layer consolidation to reduce switch port density requirements
• Inter-building or campus-scale data center network extensions on existing SMF infrastructure
• Next-generation cloud service provider (CSP) backbone interconnection at regional hubs
• Research institution high-speed research networks supporting scientific computing workloads

Technical specifications

Available from Omnixon Global. Submit an RFQ and our team will confirm configuration and availability for your order.