800G QSFP-DD Passive DAC Twinax Copper Cable (0.5-2m): 800G-PDAC-QSFP-DD

Our EDGEOPTIC 800G-PDAC-QSFP-DD is a multi-vendor compatible 800G QSFP-DD passive direct attach copper cable designed for ultra-high-performance 800 Gigabit Ethernet and InfiniBand NDR applications within data center environments built on QSFP-DD infrastructure. The 800G-PDAC-QSFP-DD cable features point-to-point configuration with QSFP-DD (Quad Small Form Factor Pluggable Double Density) connectors on both ends, delivering high-bandwidth connectivity for short-reach interconnects between spine and leaf switches, high-performance servers, and storage systems in QSFP-DD-native network architectures.

The cable supports data rates up to 850 Gbps, utilizing eight independently operating 106.25 Gbps PAM4 lanes to accommodate the most demanding bandwidth requirements of modern data center architectures. For Ethernet deployments, the cable handles 800G Ethernet at 850 Gbps aggregate throughput, supporting the latest generation of hyperscale and cloud infrastructure. The multi-rate capability also supports 2x400G Ethernet operation at 425 Gbps per logical channel, providing deployment flexibility for environments transitioning between 400G and 800G network tiers. Additionally, the cable supports InfiniBand NDR for high-performance computing clusters and AI/ML training infrastructure. The QSFP-DD form factor maintains backward compatibility with existing QSFP-DD port infrastructure, enabling seamless integration into established network designs.

As a passive DAC solution, the 800G-PDAC-QSFP-DD requires no external power and introduces zero latency to signal transmission, making it the optimal choice for latency-critical applications such as distributed AI training, high-frequency trading systems, and real-time analytics platforms. The cable construction utilizes high-quality AWG26 twinax copper across all available lengths from 0.5 to 2 meters, ensuring optimal signal integrity at 106.25 Gbps PAM4 signaling per lane across eight lanes while maintaining practical cable flexibility for installation in high-density switch environments.

The electrical interface conforms to QSFP-DD MSA and CMIS Rev 4.0/5.0 specifications, ensuring broad compatibility with standard QSFP-DD host systems from multiple equipment vendors. Our 800G QSFP-DD DAC cables can be encoded for compatibility with major networking vendors supporting next-generation 800G infrastructure. The cable incorporates DDM/DOM (Digital Diagnostic Monitoring) functionality, providing real-time diagnostic data including module temperature and supply voltage through the CMIS-compatible interface for proactive network monitoring.

Standards compliance includes IEEE 802.3ck for 100 Gbps per lane electrical signaling alongside InfiniBand NDR specifications. The cable operates within a 0 to 70C temperature range, suitable for controlled data center environments. With an MTBF rating of 1,000,000 hours, the cable delivers long-term reliability for mission-critical 800G infrastructure deployments.

Typical deployment scenarios include spine-leaf switch interconnects in QSFP-DD-native data centers, high-performance computing clusters, InfiniBand NDR fabric backbones, and storage interconnects. The passive design eliminates power consumption entirely, contributing to greener data center operations.

Our 800G QSFP-DD passive DAC is CE/RoHS certified and compliant with product safety standards. Because our focus is providing top quality service, we perform comprehensive quality checks before delivery including electrical parameter measurements, connector inspection tests, and QSFP-DD EEPROM memory data validation tests.