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800G DAC is a direct high-speed cable used within data centers that supports a data transmission rate of 800 gigabits per second. It is mainly used to connect servers, switches, GPU computing systems and other devices inside the cabinet, and is a key physical layer component for building an 800G network.
Form Factor | Part No. | Fiber Type | Data Rate | Wavelength | Distance | Connector | Temperature |
800G QSFP-DD-800G QSFP-DD Flat to Flat | CLQD8-QD8CU-0.5~2-FLT | Copper | 800G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 800G OSFP112 Finned toFinned | CLOP8-OP8CU-0.5~ 2-FIN | Copper | 800G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 800G OSFP112 Flat to Flat | CLOP8-OP8CU-0.5~ 2-FLT | Copper | 800G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 800G QSFP-DD Finned to Flat | CLOP8-QD8CU-0.5~ 2-FTF | Copper | 800G | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 2X400G OSFP112 Finned to Finned | CLOP8-2xOP4CU-0.5~ 2-FIN | Copper | 800G/400G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 2X400G OSFP112 Flat to Flat | CLOP8-2xOP4CU-0.5~ 2-FLT | Copper | 800G/400G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 2X400G OSFP112 Finned to Flat | CLOP8-2xOP4CU-0.5~ 2-FTF | Copper | 800G/400G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 2xQSFP112 Finned to Flat | CLOP8-2xQ1124CU-0.5~ 3-FTF | Copper | 800G/400G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 4xOSFP112 Finned or Flat | CLOP8-4xOP2CU-0.5~ 3-FTF | Copper | 800G/200G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 4xOSFP112 Flat or Flat | CLOP8-4xOP2CU-0.5~ 3-FLT | Copper | 800G/200G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
800G OSFP112- 4xQSFP112 Flat or Flat | CLOP8-4xQ2CU-XX-0.5~3-FLT | Copper | 800G/200G IB | Cable | 0.5M~2M | 28AWG | Com./Ind. |
Basic Composition and Types
Consisting of copper cables paired with high-speed connectors (e.g., QSFP‑DD, OSFP) fixed at both ends, they are categorized into Direct Attach Copper cables (DAC), Active Copper Cables (ACC), and Active Electrical Cables (AEC).
Key Technical Parameters
- Speed: 800 Gbps (8 lanes *100 Gbps PAM4 modulation).
- Main Reach: DAC typically 1–3 m; AEC can reach 3–5 m or longer.
- Power Consumption: Extremely low (near 0 W for passive DAC, about 1–2 W/port for active cables), far lower than optical modules.
- Latency: Sub‑nanosecond, extremely low.
Core Application Scenarios
- Short‑reach intra-rack connections in data centers: e.g., Top‑of‑Rack (ToR) switch to server, or switch‑to‑switch cluster interconnects.
- AI/High‑Performance Computing clusters: Leading vendors prioritize DAC whenever possible to maximize energy efficiency and minimize latency.
Core Advantages
- Ultra‑low Cost: Port cost can be >40 % lower than equivalent 800 G optical modules.
- Ultra‑low Power and Latency: Significantly reduces data‑center operational expenses and cooling overhead.
- Plug‑and‑play, High Reliability: Passive design requires no configuration and exhibits low failure rates.
800 G DAC serves as a foundational technology for short‑reach, low‑cost, high‑efficiency connections inside data centers, with its importance becoming increasingly prominent in the era of AI computing.
C-LIGHT 800G DAC direct attach copper cables are designed for ultra-high-speed, short-distance connections in AI data centers, GPU clusters, high-performance computing platforms, and high-density switching environments. Unlike optical interconnects, DAC uses a direct copper transmission path between compatible high-speed interfaces, making it particularly suitable for very short equipment connections.
The 800G DAC family supports QSFP-DD and OSFP112 platforms and provides several connector configurations for different network architectures. Available options include direct 800G connections as well as 800G-to-400G and 800G-to-200G breakout configurations.
The standard cable configurations use 28AWG copper conductors and are primarily intended for short-distance deployment, with listed cable lengths generally covering 0.5m to 2m. Selected configurations can support cable lengths up to 3m. This makes the product especially suitable for intra-rack and adjacent-equipment connections where low latency, low power consumption, and simplified cabling are important.
The 800G DAC platform provides up to 800Gbps connectivity for next-generation data center and accelerated computing infrastructures.
The product family supports both QSFP-DD and OSFP112 interfaces, allowing the cable to match different 800G network equipment designs.
The cable uses a direct copper transmission path, avoiding optical conversion for extremely short connections between compatible ports.
Breakout configurations allow an 800G interface to connect with two 400G interfaces for flexible network topology design.
Selected configurations provide connections from one 800G interface to multiple 200G ports for high-density network architectures.
The listed product configurations use 28AWG copper conductors to support high-speed short-reach connections in dense equipment environments.
Standard configurations are designed around 0.5m to 2m cable lengths, with selected configurations extending toward 3m.
As a direct copper solution, DAC avoids the optical transmit and receive power required by active optical modules, making it suitable for power-conscious short links.
800G DAC can connect GPU servers, AI accelerators, and high-speed switches inside dense computing clusters where large amounts of data must move between processing resources.
The short cable length makes DAC particularly suitable for connecting equipment installed within the same rack.
Compatible 800G switches can be directly connected to high-performance servers using short DAC assemblies.
800G DAC can provide high-bandwidth connections between nearby switches where the physical distance is within the supported copper reach.
High-speed copper interconnects can be deployed in portions of AI network fabrics where very short links are available and power efficiency is important.
High-performance computing systems can use 800G DAC for short connections between compute nodes and high-speed switching infrastructure.
800G-to-2x400G configurations provide a practical connection architecture when integrating 800G network ports with existing 400G equipment.
The direct copper design is useful for dense racks where short physical links can reduce cabling complexity and avoid unnecessary optical components.
800G DAC is designed specifically for applications where the connection distance is short enough to take advantage of direct copper transmission.
Compared with active optical solutions, a passive DAC does not require optical transmitters and receivers, helping reduce power consumption on short connections.
The direct electrical transmission path provides extremely low latency, making DAC attractive for latency-sensitive AI and HPC interconnects.
QSFP-DD and OSFP112 configurations cover several equipment-side combinations, including direct and breakout architectures.
800G-to-400G and 800G-to-200G configurations provide additional options when building mixed-speed network fabrics.
The integrated cable assembly eliminates the need to separately install optical transceivers and fiber patch cords for supported short-distance links.
C-LIGHT states that the 800G DAC is compatible with switches from more than 100 brands, supporting deployment across different equipment platforms.
C-LIGHT provides customized DAC configurations according to connector combination, cable length, equipment compatibility, and network topology requirements.
An 800G DAC is a direct attach copper cable designed to provide 800Gbps high-speed connectivity over very short distances without using optical transceiver modules.
The product family supports QSFP-DD and OSFP112 interfaces, with several direct and breakout connector combinations.
The current product specifications primarily list 0.5m to 2m configurations, with selected cable designs extending toward 3m.
Yes. The product family includes OSFP112-to-2xOSFP112 configurations for 800G-to-400G connectivity.
Yes. C-LIGHT lists 800G-to-200G breakout configurations using multiple OSFP112 or QSFP112 connections.
The listed 800G DAC configurations use 28AWG copper cable.
Typical applications include AI GPU clusters, HPC systems, intra-rack connections, switch-to-server links, and short-distance switch-to-switch interconnects.
C-LIGHT specifies IEEE 802.3ck/cd/bj/by communication protocol compliance, SFF-8665 interface protocol compliance, and QSFP-DD/OSFP MSA packaging compatibility.
C-LIGHT 800G DAC direct attach copper cables provide a low-power, low-latency solution for ultra-short 800G interconnections in AI data centers, GPU clusters, HPC systems, and high-density switching environments. Supporting QSFP-DD and OSFP112 platforms, the product family includes direct 800G connections together with 800G-to-400G and 800G-to-200G breakout configurations. With 28AWG copper construction and short cable lengths primarily covering 0.5m to 2m, the 800G DAC series is optimized for intra-rack and nearby equipment connections where high bandwidth and efficient physical-layer connectivity are required.
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