As hyperscale data centers and AI infrastructure scale rapidly, the need for low-latency, high-bandwidth, and cost-effective connectivity becomes more urgent. Among the most crucial components of intra-data center interconnects are high-speed copper cables, including:
- DAC (Direct Attach Cable)
- ACC (Active Copper Cable)
- AEC (Active Electrical Cable)
These copper-based solutions address the needs of short- to medium-distance connections, offering a balance between signal performance, transmission distance, and power efficiency.
Overview: What Are DAC, ACC, and AEC?
| Type | Signal Integrity | Distance | Power | Cost | Flexibility |
|---|---|---|---|---|---|
| DAC | Low | ≤3m | 0W | 💲 Lowest | Rigid |
| ACC | Medium | 3–7m | <2W | 💲💲 Mid | Moderate |
| AEC | High | 5–15m+ | ~3W | 💲💲💲 High | High |
1. What is DAC (Direct Attach Cable)?
DAC is a passive copper cable that requires no external power or electronics. It’s ideal for short-range, cost-sensitive applications within server racks.
- Zero power consumption
- Low latency (<0.1μs)
- Ultra-low cost
- Limitations: Only supports up to 3m, reduced reach at 800G speed
Best use case: Server-to-switch in-rack links for hyperscale deployments.
2. What is ACC (Active Copper Cable)?
ACC features a Redriver chip at the Rx end, which boosts signal quality and extends reach beyond DAC capabilities.
- Signal equalization with CTLE and Driver
- Lower attenuation
- Power consumption: 1.2–1.8W
- More flexible and longer reach than DAC
Best use case: Intra-rack connections or medium-distance switch/server links.
3. What is AEC (Active Electrical Cable)?
AEC integrates a Retimer chip at both ends, offering full signal regeneration and superior performance.
- Advanced signal processing: CTLE, DFE, CDR, FIR drivers
- Supports long distances (5–15m+)
- Highest signal integrity
- Ideal for dense cabling environments
Best use case: Cross-rack interconnects, AI data centers, and complex wiring.
Use Case Recommendations
| Scenario | Recommended Cable |
|---|---|
| Server-to-ToR within same rack | DAC |
| Short cross-rack or chassis switch | ACC |
| Long reach, high-density networks | AEC |
| AI-driven data centers | AEC |
| Budget-sensitive deployments | DAC |
Market Trends & Adoption Outlook
According to LightCounting, the global high-speed cable market will reach $6.7 billion by 2029, with AEC capturing the largest share due to AI-driven demand and advanced networking needs.
- AEC is the fastest-growing due to longer reach and signal stability
- DAC remains dominant for low-cost, short links
- ACC bridges the gap with better reach at mid-range cost
Choosing the Right Cable: A Strategic Decision
Select based on:
- Distance requirements (≤3m → DAC, 3–7m → ACC, >7m → AEC)
- Signal integrity needs
- Power & thermal budgets
- Rack density and cable routing complexity
Conclusion
High-speed copper cables—DAC, ACC, and AEC—each serve a unique purpose in building scalable, efficient, and high-performance data center networks.
- DAC: Passive, simple, and cheap.
- ACC: Balanced solution for distance and signal quality.
- AEC: Best-in-class performance for complex, high-speed deployments.
The right choice enhances reliability, reduces cost, and prepares your infrastructure for next-generation AI and HPC workloads.
About Optech
Optech Technology Co. Ltd was founded in 2001 in Taipei, Taiwan. The company was created with a sole purpose, to provide a wide and high quality portfolio of optical products to a very demanding and fast evolving market.
To respond to the permanent increase of IP traffic, Optech portfolio is constantly growing. Since the beginning, the company has always been up to date with the latest innovations on the market. Today, we are proud to deliver a large selection of 25G SFP28, 40G QSFP+, 100G QSFP28, 200G QSFP56, 400G QSFP-DD, 800G QSFP-DD and OSFP optical transceivers and cables.
Optech has a large portfolio of products which include optical transceivers, direct attach cables, active optical cables, loopback transceivers, media converters and fiber patch cords.
Through its large selection of optical products, that have a range of data speed from 155 Mbps to 800 Gbps and reach distances up to 120km, Optech products are suitable for various industries such as telecom, data centers as well as public and private networks.
To know more about compatible brands available click here.
For additional information about our DAC, ACC, and AEC, or price inquiry, please contact us at sales@optech.com.tw
