Active Electrical Cable (AEC)丨New Solution for AI Data Center Networks

As AI workloads continue to increase network bandwidth requirements, data center interconnects are moving toward higher speeds, lower power consumption, and greater port density. Active Electrical Cable (AEC) has emerged as an important connectivity solution between high-speed network devices, especially in 400G, 800G, and next-generation 1.6T AI data center networks.

Compared with traditional Direct Attach Copper (DAC), AEC integrates active electronic components into the cable assembly to improve signal integrity over longer electrical links. This makes AEC particularly suitable for high-speed connections where passive copper cabling becomes increasingly difficult to manage.

1. What Is Active Electrical Cable (AEC)?

Active Electrical Cable, commonly abbreviated as AEC, is a high-speed electrical interconnect that uses active signal-conditioning components inside the cable assembly.

Unlike passive DAC, which relies primarily on the electrical characteristics of the copper cable, AEC uses active electronics to compensate for signal loss and degradation. The result is a more robust electrical connection for high-speed data transmission.

A typical AEC includes:

• Copper conductors

• High-speed signal-conditioning components

• Connectors such as QSFP, QSFP-DD or OSFP

• Power management circuitry

• High-speed electrical interfaces

This architecture allows AEC to provide higher-speed connectivity while maintaining the advantages of copper-based interconnects.

2. Why AI Data Centers Need AEC

AI data centers are fundamentally changing the requirements for network interconnects. GPU clusters require extremely high bandwidth and low latency connections between GPUs, switches, servers, and storage systems.

As network speeds increase from 400G to 800G and toward 1.6T, passive copper cables face increasing challenges related to insertion loss, signal attenuation, crosstalk, and power efficiency.

AEC provides a middle ground between passive copper and optical connectivity.

• Higher performance than conventional passive DAC

• Lower cost than many optical interconnect solutions

• Low latency for AI cluster communication

• Efficient short-distance rack and row connectivity

• Improved signal integrity at high data rates

3. AEC vs DAC vs AOC

AEC, DAC, and AOC are all used for high-speed data center interconnection, but they are designed for different application requirements.

For very short connections, DAC can remain an economical option. When electrical reach and signal integrity become more challenging, AEC can provide a practical alternative. For longer distances, AOC and optical transceivers become more attractive.

4. How AEC Works

The fundamental principle of AEC is to compensate for the signal degradation introduced by the electrical transmission path.

At high data rates, electrical signals experience increasing attenuation and distortion as they travel through copper. AEC incorporates active signal-conditioning technology to improve the quality of the transmitted electrical signal.

The basic signal path can be understood as:

Switch / GPU → AEC Connector → Active Signal Conditioning → Copper Cable → Active Signal Conditioning → AEC Connector → Switch / GPU

The active circuitry helps maintain signal quality and enables higher-speed electrical transmission than a comparable passive cable design.

5. AEC in 400G AI Networks

400G Ethernet has become an important building block for modern data center networks. AEC can be used for short-distance connections between switches, servers, and other high-bandwidth equipment.

In 400G environments, AEC can help simplify high-density cabling while maintaining low latency and relatively low power consumption.

Typical applications include:

• 400G switch-to-server connections

• 400G switch-to-switch connections

• AI server interconnection

• High-performance computing clusters

• Data center rack-level networking

6. 800G AEC for AI Data Centers

800G AEC Cable | OSFP QSFP-DD Active Electrical Cable for Data Centers丨C-LIGHT

As AI clusters move toward 800G networking, the requirements placed on electrical interconnects become significantly more demanding.

800G AEC solutions are designed to support high-speed electrical connectivity while addressing the signal integrity challenges associated with next-generation network interfaces.

For AI infrastructure, 800G AEC can be considered for connections where the distance is short enough for copper but the bandwidth is too high for conventional passive DAC designs.

This makes 800G AEC particularly relevant to:

• AI GPU clusters

• High-performance computing

• 800G Ethernet switches

• Server-to-switch interconnection

• Rack-scale AI networking

7. AEC and 1.6T Network Evolution

The transition toward 1.6T networking introduces even greater challenges for electrical signal transmission.

At 1.6Tbps, each electrical lane must operate at extremely high signaling rates. This places strict requirements on PCB design, connectors, cable construction, signal conditioning, thermal management, and system-level interoperability.

AEC is therefore expected to remain an important technology for selected short-reach interconnect applications as data center architectures evolve toward 1.6T.

However, the optimal solution will depend on distance, power budget, port density, thermal conditions, and the architecture of the AI cluster.

8. Key Advantages of AEC

8.1 Improved Signal Integrity

Active signal conditioning helps compensate for electrical losses and maintain signal quality at high data rates.

8.2 Low Latency

AEC maintains an electrical transmission path, making it suitable for applications where extremely low latency is important.

8.3 Lower Cost for Short-Reach Links

For suitable short-distance applications, AEC can provide a cost-effective alternative to optical solutions.

8.4 High Port Density

AEC can support high-density switch and server deployments, which is particularly important in AI racks where thousands of high-speed connections may be required.

8.5 Simplified Cabling

Pre-terminated cable assemblies reduce the complexity associated with individual transceiver and fiber connections.

9. AEC Power Consumption

Power efficiency is one of the most important considerations in AI data centers.

Unlike passive DAC, AEC requires power for its active electronics. However, the overall system-level power consumption can still be attractive for short-reach applications because AEC avoids the optical conversion stages required by optical interconnects.

When evaluating AEC, engineers should consider:

• Power consumption per cable

• Total rack-level cable count

• Switch port power budget

• Thermal density

• Cooling requirements

10. AEC and AI Cluster Architecture

Modern AI infrastructure typically consists of GPU servers, high-speed Ethernet or InfiniBand switches, optical modules, copper interconnects, and fiber infrastructure.

AEC is most valuable in the short-reach portion of this architecture.

GPU Server → AEC → AI Switch

For longer connections, optical solutions can be used to extend the network beyond the practical electrical reach of copper.

This creates a hybrid architecture in which DAC, AEC, AOC, and optical transceivers work together rather than competing as a single technology.

11. AEC Applications

• AI data centers

• GPU clusters

• HPC networks

• Cloud data centers

• High-speed Ethernet networks

• Server-to-switch connections

• Switch-to-switch short-reach connections

• Rack-scale networking

12. AEC Testing and Validation

High-speed AEC products require extensive electrical and system-level validation before deployment.

Important testing areas include:

• Eye diagram testing

• Bit Error Rate (BER)

• Insertion loss

• Return loss

• Crosstalk

• Jitter

• Signal integrity

• Power consumption

• Thermal performance

• Host compatibility

For 800G and future 1.6T products, validation becomes increasingly important because small signal-quality issues can have a significant impact on system reliability.

13. AEC and C-LIGHT Solutions

C-LIGHT focuses on high-speed optical and electrical interconnect solutions for modern data center and AI networking environments.

Its high-speed interconnect portfolio can include AEC solutions for different network generations, including 400G, 800G, and next-generation high-bandwidth applications.

For AI data center deployments, AEC can be combined with C-LIGHT optical transceivers, DAC, AOC, and other interconnect products to create a flexible connectivity architecture.

Product Placement: This section can be used to insert the relevant C-LIGHT 400G, 800G, and 1.6T AEC product cards or product links.

14. How to Choose AEC for an AI Data Center

Selecting an AEC solution requires more than simply matching the data rate.

• Data Rate: Select 400G, 800G, or higher-speed solutions according to the network architecture.

• Reach: Confirm that the electrical distance is within the cable's supported range.

• Power: Evaluate cable power consumption together with the switch and rack power budget.

• Compatibility: Verify compatibility with switches, GPUs, NICs, and network platforms.

• Thermal Environment: Consider cable density and cooling conditions in high-power AI racks.

• Mechanical Design: Select appropriate connector types and cable configurations for the rack architecture.

15. The Future of AEC

The rapid expansion of AI computing is creating unprecedented demand for high-bandwidth, low-latency interconnects.

AEC is positioned between passive copper and optical connectivity, providing a practical solution for specific short-reach applications. As 800G becomes increasingly common and 1.6T networking develops, active electrical technologies will continue to evolve in areas such as signal conditioning, power efficiency, thermal management, and system integration.

At the same time, optical technologies will continue to dominate longer-reach and increasingly demanding interconnect applications. The future data center is therefore likely to use a combination of DAC, AEC, AOC, optical transceivers, and eventually CPO.

16. Q&A Active Electrical Cable

17. Conclusion

Active Electrical Cable is becoming an important option for high-speed AI data center interconnects. By combining the low latency and cost advantages of copper with active signal conditioning, AEC addresses some of the limitations of passive DAC at higher data rates.

As networks evolve from 400G to 800G and toward 1.6T, AEC, AOC, DAC, and optical transceivers will increasingly operate as complementary technologies. For AI data centers, selecting the right combination according to bandwidth, reach, power, density, and thermal requirements will be essential for building efficient next-generation networks.