800G QSFP-DD Passive Direct Attach Copper (DAC) Cable

SpecificationsFeaturesApplicationsVideosDatasheetsFAQsInquirySpecifications High-Performance 800G QSFP-DD DAC with 112G PAM4 Signaling As AI workloads and hyperscale data centers transition to 800G Ethernet, maintaining signal integrity at 112G PAM4 becomes the ultimate engineering challenge. COMNEN’s 800G QSFP-DD Passive Direct Attach Copper (DAC) cables are purpose-built to meet this demand, offering a robust, IEEE 802.3ck compliant solution for high-density interconnects. By utilizing premium silver-plated conductors and automated precision shielding, our DACs achieve a Bit Error Rate (BER) of less than 1E-15, ensuring seamless data transmission across AI training clusters and HPC environments. With 0W power consumption and an advanced Type 2 heatsink design, COMNEN provides the thermal efficiency and ultra-low latency required to optimize your network’s Total Cost of Ownership (TCO) without compromising on reach or reliability. Specifications Compatible Generic Vendor Name COMNEN Max Data Rate 800Gbps Form Factor QSFP-DD to QSFP-DD Wire AWG 30/28/26AWG Conductor Copper Cable Type Passive Twinax Minimum Bend Radius 30mm Temperature Range 0 to 70°C (32 to 158°F) Jacket Material PVC (OFNR) Modulation Format PAM4 Protocols QSFP-DD MSA, IEEE 802.3ck, CMIS v5.0 Power Consumption <0.1W(EEPROM/MCU) Cable Length 0.3m~3m Power Supply 3.3V Application 800G Ethernet, IB NDR, AI Center Compliant RoHS Warranty 5 Years Features: 112G PAM4 Performance and Zero-Power Efficiency Advanced Type 2 Heatsink Housing: Engineered with an integrated high-profile fin design, our Type 2 housing significantly increases surface area for longitudinal airflow. This provides superior thermal dissipation, ensuring switch port stability in high-density 800G AI configurations. Seamless Backward Compatibility: Designed for versatile network integration, the 800G QSFP-DD form factor is fully backward compatible with 400G QSFP-DD ports. This allows for a flexible, cost-effective migration path from legacy 400G infrastructure to next-gen 800G speeds. Premium Silver-Plated Copper Conductors: To combat the aggressive signal attenuation of 112G PAM4, we utilize ultra-pure, silver-plated twinax copper. This premium material minimizes skin-effect losses and ensures a robust link budget with a Bit Error Rate (BER) exceeding industry standards. Zero-Watt Passive Architecture: As a purely passive copper solution, our 800G DAC consumes 0W of power. This eliminates the need for active cooling at the cable level, drastically reducing the Total Cost of Ownership (TCO) and thermal load on your data center’s cooling system. Automated Precision Shielding: Our manufacturing process employs automated laser-stripping and high-precision soldering to maintain a strict 100-ohm impedance profile. This eliminates signal reflections and Near-End Crosstalk (NEXT), providing the “clean” signal required for 800G Ethernet and InfiniBand XDR. High-Density Applications: Optimizing AI Clusters and HPC Backends Switches, servers and routers, Data Center networks, Storage area networks, High performance computing, Telecommunication and wireless infrastructure, Medical diagnostics and networking, Test and measurement equipment… Connectivity Solutions Spine-Leaf -Server Architecture This is the primary use case for 800G DACs. In a “Top-of-Rack” (ToR) deployment, the 800G QSFP-DD DAC connects high-performance AI servers (equipped with 800G NICs) to the Leaf switch. Because these distances are typically under 3 meters, the 0W passive copper design provides the lowest possible latency and power consumption for the entire rack. Global Standards & Certifications COMNEN 800G products are fully compliant with international environmental and safety regulations, making them eligible for global tenders and enterprise deployments: RoHS & REACH: 100% lead-free and compliant with European chemical safety standards. CE & FCC: Certified for electromagnetic compatibility (EMC) in high-density rack environments. FeaturesApplicationsVideosDatasheets 800G QSFP-DD Passive Direct Attach Cable Datasheet FAQs Q: Is the 800G QSFP-DD DAC backward compatible with 400G or 200G ports? A: Yes, one of the primary advantages of the QSFP-DD (Double Density) form factor is its backward compatibility. The 800G QSFP-DD connector can physically plug into 400G QSFP-DD or even legacy QSFP56/QSFP28 cages. However, compatibility depends on the switch’s firmware and port configuration. Using a COMNEN 800G DAC in a 400G port will typically down-rate the link to 400G speeds, providing a flexible migration path for data center upgrades. Q: Why should I choose 26AWG over 30AWG for my 800G DAC cable? A: The choice of American Wire Gauge (AWG) depends on your required reach. For 800G speeds using 112G PAM4 signaling, signal attenuation is aggressive. 26AWG: Features a thicker conductor, which reduces insertion loss. This is required for longer distances (2.0m to 3.0m) to maintain signal integrity. 30AWG: Features a thinner, more flexible conductor. It is ideal for short-reach, intra-rack connections (0.5m to 1.5m) where cable routing density and airflow are priorities. Q: What is the benefit of the “Type 2” Heatsink design on COMNEN 800G connectors? A: At 800G, thermal management is critical for switch stability. Our Type 2 Heatsink design features integrated, high-profile cooling fins that significantly increase surface area compared to standard Type 1 housings. This allows for superior heat dissipation from the switch’s internal components. Since our DAC is a 0W passive solution, the Type 2 design helps the cable act as a “heat sink,” preserving the thermal budget for adjacent high-power optical transceivers. Q: Do you provide SI (Signal Integrity) test reports for 800G projects? A: Absolutely. Every batch of COMNEN 800G QSFP-DD DACs undergoes 100% factory testing using 100GHz Vector Network Analyzers (VNA). We provide detailed Eye Diagram Analysis and Bit Error Rate (BER < 1E-15) reports upon request. These reports validate that our cables meet IEEE 802.3ck standards for insertion loss, return loss, and crosstalk, ensuring “plug-and-play” reliability in AI and HPC clusters. Inquiry Your name Your email Your Company Your Phone Request Product Your Product Details Δ×