I. Foreword: Data Deluge Spurs Transmission Revolution
Driven by the exponential growth of data center scale and the explosion of AI computing demands, high-speed interconnect technology is undergoing a paradigm shift. Traditional passive DACs (Direct Attach Cables) are limited by the physical properties of copper cables, facing bottlenecks such as increased signal attenuation and shortened transmission distances in the 100G/200G transmission era. Active DACs (Active DAC) have achieved a leap from "physical connection" to "intelligent transmission" by integrating built-in signal processing chips, becoming a key technological breakthrough for medium-to-short distance interconnection in data centers.
II. Technical Breakthrough: Signal Processing Reshapes Transmission Boundaries
(I) Innovation in Working Principles
Active DACs integrate Retimer/Redriver chips on traditional copper cables, building a "signal enhancement-equalization-amplification" three-stage processing chain:
1. Pre-emphasis technology: Compensates for high-frequency signal attenuation
2. Adaptive equalization: Dynamically optimizes signal waveforms
3. Linear amplification: Improves signal-to-noise margin
(II) Performance Parameter Comparison
| Indicator | Passive DAC | Active DAC | Fiber AOC |
|---|---|---|---|
| Max Speed | 100G@5m | 400G@15m | 800G@500m |
| Power Consumption (W/m) | 0.05 | 0.12 | 0.3 |
| Cost ($/m) | 20 | 50 | 150 |
| Latency (ns) | 5.2 | 7.8 | 12.5 |
(III) Technical Advantage Matrix
1. Extended Distance: Supports 400G transmission up to 15 meters (passive DAC only 5 meters)
2. Optimized Energy Efficiency Ratio: 60% lower power consumption compared to fiber AOC
3. Cost Control: System-level cost savings of 65% compared to AOC
4. Flexible Deployment: Supports leveraging existing copper cable infrastructure
III. Scenario Adaptation: Precisely Meeting Data Center Demands
(I) Core Application Scenarios
1. In-rack interconnection: High-density connection between servers and ToR switches within 10 meters
2. Inter-row interconnection: Supports 100G/200G transmission between adjacent racks within 15 meters
3. AI training clusters: Low-latency, high-bandwidth communication between GPU nodes
4. Storage Area Networks: Stable data transmission in SAN environments
(II) Typical Cases
- A supercomputing center adopted Active DAC to achieve 200Gbps@10m transmission, with a bit error rate controlled below 1e-15
- After deploying Active DAC, an internet data center increased wiring density by 40% and reduced operation and maintenance costs by 35%
IV. Technical Evolution: Next-Generation Active DAC Development Path
(I) Key Technical Breakthroughs
- 3D Packaging Technology: Integrating Retimer chips into connectors
- Silicon Photonics Collaborative Design: Hybrid architecture of optical modules and Active DAC
- Intelligent Diagnostic System: Built-in BIST (Built-in Self-Test) function
(II) Standard Evolution
- IEEE 802.3ck 200GBASE-DR standard supports Active DAC
- OIF CEI-56G/112G active copper cable specifications under development
- ANSI/TIA-568-C.3 standard includes active copper cable testing methods
V. Market Insight: Dynamic Balance of Supply and Demand
(I) Global Market Overview
According to the latest report from Global Market Insights, the global Active DAC market size will reach **$1.8 billion in 2025**, with a compound annual growth rate (CAGR) of **28% from 2023-2028**. This growth is primarily driven by the following factors:
- Data Center Expansion: The number of global hyperscale data centers is expected to reach 1,200 by 2025, driving demand for medium-to-short distance interconnection.
- Explosion of AI Computing Power: GPU server shipments are growing by 45% annually, driving demand for high-speed connections in HPC clusters.
- 5G Fronthaul / Backhaul: 5G base station construction is boosting demand for 25G/50G Active DAC.
(II) Application Scenario Distribution
| Application Scenario | 2025 Market Share | 2023-2028 CAGR | Core Driving Factors |
|---|---|---|---|
| Data Centers | 75% | 25% | Large-scale deployment of 100G/200G ToR switches |
| AI/HPC | 12% | 42% | Demand for low-latency interconnection for large model training |
| Telecom Infrastructure | 8% | 35% | 5G core network CU/DU separation architecture upgrade |
| Industrial Automation | 5% | 22% | Industrial Internet's demand for deterministic communication |
(III) Driven by Technology Iteration
- Speed Evolution:
100G Active DAC will account for 60% of the market in 2025, with 200G/400G products entering a rapid penetration period.
800G Active DAC research and development has commenced, with commercialization expected in 2027.
- Technology Convergence:
Silicon photonics integrated Active DAC (e.g., Intel OPA) drives a 30% cost reduction.
Intelligent diagnostic features improve Active DAC O&M efficiency by 40%.
(IV) Challenges and Opportunities
- Challenges:
Fluctuations in copper cable raw material prices impacting profit margins.
Substitution pressure from fiber AOC in scenarios beyond 50 meters.
- Opportunities:
Promotion of liquid cooling technology drives demand for temperature-resistant Active DACs.
Construction of edge data centers creates demand for distributed Active DAC solutions.
VI. Future Outlook: The Cornerstone of Intelligent Interconnection
Active DAC is evolving from a single signal enhancement tool to an intelligent transmission system, and its development will show three major trends:
- Speed Breakthrough: 800G Active DAC R&D initiated, supporting 30-meter transmission.
- Architecture Integration: Deep collaborative design with optical modules and switching chips.
- Green Manufacturing: Carbon footprint tracking system for full life-cycle management.
As a core solution for the data center's "last mile," Active DAC is reshaping the value standards of high-speed interconnection through technological innovation and cost optimization. With the continuous driving force of emerging fields like AI and autonomous driving, Active DAC is expected to become a key enabling technology for global digital infrastructure in the next 5 years.
Note:
Standard References: IEEE 802.3ck, OIF CEI, TIA-568-C.3
Market Data: Quoting Global Market Insights 2025 Forecast Report