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400G QSFP-DD Direct Attach Copper Cable (DAC), PAM4
Categories:
Product Highlights:
- 400G QSFP-DD connectivity
- 8-lane PAM4 architecture
- Passive copper design
- Low power consumption
- Optimized for low loss and low crosstalk
- Straight-through and breakout options
- Designed for high-density data centers
Table of Contents
Description
The 400G QSFP-DD Direct Attach Copper Cable (DAC) is a high-speed passive copper interconnect designed for short-distance 400Gbps data center and high-performance networking applications. Using PAM4 signaling across the 8-lane QSFP-DD electrical interface, it provides a high-bandwidth, low-power connection between compatible 400G network devices without requiring separate optical transceivers. Its optimized copper construction helps reduce insertion loss and crosstalk to maintain signal integrity at high data rates. Available in straight-through and breakout configurations, the cable provides flexible connectivity for switches, servers, network adapters, and other high-density data center equipment.
Specification
| Data Rate | 400Gbps |
|---|---|
| Signaling | PAM4 |
| Form Factor | QSFP-DD |
| Connector | QSFP-DD |
| Cable Configuration | Straight-through / Breakout |
| Cable Gauge | 28AWG / 30AWG |
| Compatibility | IEEE 802.3bj, IEEE 802.3cd |
| Signal Integrity | Optimized for reduced insertion loss and crosstalk |
| Latch Design | Pull-to-release slide latch |
| EMI Control | Customized cable braid termination |
| EEPROM | Customizable EEPROM mapping |
Features
- 400G QSFP-DD to QSFP-DD connectivity
- Up to 400Gbps aggregate bandwidth
- 8-lane QSFP-DD electrical interface
- PAM4 signaling
- Passive Direct Attach Copper design
- Low power consumption
- Optimized for low insertion loss
- Reduced crosstalk for improved signal integrity
- Straight-through and breakout configurations
- High-density rack connectivity
- No separate optical transceivers required
- Designed for short-distance applications
Applications
- 400G Ethernet networks
- Data center switches
- Switch-to-switch connections
- Switch-to-server connectivity
- Network adapter connections
- High-performance computing
- AI and high-density computing infrastructure
- High-density rack interconnects
- Short-distance 400G network connections
FAQ
What signaling technology does the cable use?
The cable uses PAM4 electrical signaling across the 8-lane QSFP-DD interface to support high-speed 400G connectivity.
Is this cable passive?
Yes. It is a passive Direct Attach Copper Cable, providing low power consumption and a cost-effective solution for short-distance 400G connections.
What is the benefit of the optimized copper construction?
The cable is designed to reduce insertion loss and crosstalk, helping maintain signal integrity for reliable 400G transmission.
Are breakout configurations available?
Yes. In addition to straight-through QSFP-DD-to-QSFP-DD configurations, breakout options are available for network architectures requiring connections to multiple lower-speed interfaces.
What equipment can this DAC connect?
It is suitable for compatible 400G switches, servers, network adapters, HPC systems, and other high-density networking equipment with QSFP-DD interfaces.
Featured DACs & AOCs Comparison Guide
| SKU | Cable Type | Data Rate | Form Factor A | Form Factor B | Wire Type | Length |
| AOC-100GQSFP28-5 | AOC | 100G | QSFP28 | QSFP28 | OM4 Fiber Cable | 5M |
| AOC-10GSFP-10 | AOC | 10G | SFP+ | SFP+ | OM4 Fiber Cable | 10M |
| AOC-25GSFP28-3 | AOC | 25G | SFP28 | SFP28 | OM4 Fiber Cable | 3M |
| AOC-40GQSFP-10 | AOC | 40G | QSFP+ | QSFP+ | OM3 Fiber Cable | 10M |
| AOC-QSFP-10G4SFP-5 | AOC | 40G | QSFP+ | 4*SFP+ | OM3 Fiber Cable | 5M |
| AOC-QSFP28-4SFP28-3 | AOC | 100G | QSFP28 | 4×SFP28 | OM3 Fiber Cable | 3M |
| DAC-100GQSFP28-25G4SFP28-P5 | DAC | 100G | QSFP28 | 4×SFP28 | 24AWG | 5M |
| DAC-100GQSFP28-P3 | DAC | 100G | QSFP28 | QSFP28 | 26AWG | 3M |
| DAC-10GCX4-P05 | DAC | 10G | CX4 | CX4 | 28AWG | 3M |
| DAC-10GSFP-P10 | DAC | 10G | SFP+ | SFP+ | 24AWG | 10M |
| DAC-400GQSFP-P5 | DAC | 400G | QSFP-DD | QSFP-DD | 30AWG | 5M |
| DAC-40GQSFP-P07 | DAC | 40G | QSFP+ | QSFP+ | 28AWG | 7M |
| DAC-QSFP-10G4SFP-P03 | DAC | 40G | QSFP+ | 4 * SFP+ | 30AWG | 3M |
| DAC-SFP-P05 | DAC | 1.25G | SFP | SFP | 30AWG | 5M |
Quality Qulifications and Compliance
To get the detailed certification, please go to the Compliance.
Please Note: Our products comply with all internationally recognized and industry-standard specifications. For customized or special requirement products, we carry out testing and standards in accordance with the conformity criteria specified in the contract.
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