Upgrade Your Network with the Best: 400G QSFP56-DD DAC from Ascentoptics!

Looking to take your network performance to the next level? Ascentoptics, the leading supplier of networking solutions from China, has got you covered. Introducing our revolutionary 400G QSFP56-DD DAC, a game-changer in the industry. Say goodbye to slow connections and hello to lightning-fast data transfers. With our high-quality, reliable, and cost-effective solution, you can optimize your network’s efficiency and stay ahead of the competition. Don’t miss out on this opportunity to upgrade your network infrastructure. Contact us now to learn more about our special offers and how our 400G QSFP56-DD DAC can transform your network into a powerhouse.

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    Introducing 400G QSFP56-DD DAC from AscentOptics

• AscentOptics provides QSFP-DD Passive Direct Attach Copper cables as a high-speed, cost-effective alternative for 400G Ethernet applications in data centers.
• The cables contain 16 high-speed copper pairs with data rates up to 53Gb/s, ideal for short links and providing lower costs and power requirements.
• Lengths of 1, 2, 2.5, and 3 meters available to establish a 400-Gigabit connection between QSFP-400G ports of switches/routers within and across racks.


400G QSFP56-DD DAC Series

Part No.DescriptionData RateLengthAWGType
QDD-400G-CPO.5M400G QSFP-DD Copper DAC Cable400G/ps0.5m30Passive
QDD-400G-CP1M400G QSFP-DD Copper DAC Cable400G/ps1m30Passive
QDD-400G-CP1.5M400G QSFP-DD Copper DAC Cable400G/ps1.5m30Passive
QDD-400G-CP2M400G QSFP-DD Copper DAC Cable400G/ps2m30Passive
QDD-400G-CP2.5M400G QSFP-DD Copper DAC Cable400G/ps2.5m30Passive
QDD-400G-CP3M400G QSFP-DD Copper DAC Cable400G/ps3m30Passive

Active Cable

Part No.DescriptionData RateCable LengthWire Gauge (AWG)Cable Type
QDD-400G-CA3M400G QSFP-DD Copper DAC Cable400G/ps3 Meters30Active
QDD-400G-CA5M400G QSFP-DD Copper DAC Cable400G/ps5 Meters30Active
QDD-400G-CA7M400G QSFP-DD Copper DAC Cable400G/ps7 Meters30Active
400G QSFP-DD Copper DAC Cable,3 Meters,Passive
400G QSFP-DD Copper DAC Cable,3 Meters,Passive
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    Why Choose Our 400G QSFP56-DD DAC

• 400G QSFP56-DD Direct Attach Copper (DAC) cables provide ultra-high-speed data transfer rates of up to 400 Gigabits per second, ideal for high-performance computing and large-scale data centers.
• Crafted with 30 AWG wire gauge and precision construction, the cables are reliable and able to withstand frequent plugging/unplugging.
• Combining transceiver-like modules with a copper cable, they offer a cost-effective solution for short-range connections.
• Compatible with a wide range of equipment/applications & meeting latest industry standards, they integrate seamlessly into existing infrastructure.
• Easy ‘plug & play’ setup makes them suitable for both professional & personal use.

Related Product Recommendation

400G Passive Direct Attach Copper Cable - QSFP-DD Compatible | Direct Attach 400G QSFP-DD Cable

Our 400G Passive Direct Attach Copper Cable, QSFP-DD Compatible, is a data center networking technology breakthrough. Engineered for high performance, this cable leverages QSFP-DD (Quad Small Form Factor Pluggable Double Density) technology to deliver data rates of up to 400 Gbps. It offers an efficient and cost-effective solution for short-range, high-speed interconnects within racks and across adjacent racks. With its low power consumption and superior signal integrity, it is an ideal choice for high-density networking environments. Onetwork’s network’s speed, reliability, and scalability with the cutting-edge 400G Passive Direct Attach Copper Cable.

What is 400G Passive Direct Attach Copper Cable

What is 400G Passive Direct Attach Copper Cable

The 400G Passive Direct Attach Copper Cable is a high-performance networking cable that employs the QSFP-DD technology, positioning it amongst the fastest currently available. This evolution in data transmission technology allows for data rates to soar up to 400 Gbps. These cables have been designed primarily for short-range applications, such as linking servers within the same rack or connecting those in adjacent frames within a data center. Its exceptional signal integrity and low power consumption provide an efficient and economically viable solution for high-density networking environments. Significantly, this cable contributes to ennetwork’sour network’s speed, reliability, and scalability, thereby revolutionizing the way you perceive data center networking.

Advantages of 400G Passive Direct Attach Copper Cable

Advantages of 400G Passive Direct Attach Copper Cable

The 400G Passive Direct Attach Copper Cable brings many advantages to the table.

  1. High-Speed Data Transmission: Leveraging QSFP-DD technology, these cables support a data rate of up to 400 Gbps, facilitating blazing-fast data transmission.
  2. Efficient and Cost-Effective: Designed for short-range applications, these cables provide an efficient solution for high-speed interconnects. Compared to their fiber optic cthey’rearts, they’re significantly inexpensive, making them a cost-effective choice.
  3. Low Power Consumption: These cables exhibit lower power consumption, making them an environmentally friendly choice for data centers, which often struggle with high power usage.
  4. Superior Signal Integrity: Benefiting from high-quality materials and advanced engineering, these cables ensure exceptional signal integrity, reducing the risk of data loss during transmission.
  5. Scalability and Reliability: Besides providing high-speed connectivity and excellent signal integrity, the 400G Passive Direct Attach Copper Cable is scalable and reliable, making network expansion and maintenance more accessible and more efficient.

Integrating the 400G Passive Direct Attach Copper Cable into your data center can significantly network’sour network’s performance and efficiency.

Benefits and Features

Benefits and Features

High-Speed Connectivity

The 400G Passive Direct Attach Copper Cable offers unparalleled high-speed connectivity, ensuring efficient and rapid data transmission across networks.

Compatibility with QSFP-DD

These cables are designed to be fully compatible with QSFP-DD (Quad Small Form-factor Pluggable Double Density) systems, ensuring seamless integration into your existing network architecture.

Passive Design

The passive design of these cables eliminates the need for additional power to operate, making them an energy-efficient choice that reduces operational costs.


Due to their efficient design and high-performance capabilities, the 400G Passive Direct Attach Copper Cables are a cost-effective solution for data center networking, providing superior value for their cost.


Data Centers

The 400G Passive Direct Attach Copper Cable is an ideal solution for data centers that handle large volumes of data and require high-speed, reliable connectivity. Its superior signal integrity and high-speed data transmission capabilities make it well-suited for data center environments, ensuring efficient network operations. Moreover, its scalability and reliability features offer a robust framework for future expansion, enhancing overall network efficiency and reducing the total cost of ownership. These cables are also compatible with QSFP-DD systems, making them an excellent choice for data centers looking to integrate new technology with existing network architecture.

Telecommunication Networks

The 400G Passive Direct Attach Copper Cable brings unparalleled benefits to telecommunication networks, ensuring fast, reliable, and efficient communication. These cables’ high-speed data transmission capability supports the heavy traffic flow standard in telecom networks, reducing latency and ensuring real-time, uninterrupted communication. The energy-efficient nature of the passive design also provides significant cost savings in the long term. At the same time, the compatibility with QSFP-DD systems allows for seamless integration with existing infrastructure, reducing initial setup costs. In the rapidly evolving world of telecommunications, the adaptability and scalability offered by these cables ensure they are a sound investment for future technological advancements, offering a high return on investment.

Enterprise Networks

For enterprise networks, the 400G Passive Direct Attach Copper Cable offers a significant boost to network performance and reliability. With the ability to handle high-speed data transmission, these cables can accommodate the intense data flow and traffic associated with larger organizations, facilitating seamless operable. The cables’ passive nature also makes them an energy-efficient alternative, reducing operational expenses. Moreover, their compatibility with QSFP-DD systems ensures a smooth integration process, eliminating costly and time-consuming infrastructure overhauls. Thus, in evolving business landscapes, these cables provide an adaptable and scalable solution that aligns with future technological progress, rendering them a valuable enterprise’s enterprise’s long-term digital strategy.

Compatible Brands

The 400G Passive Direct Attach Copper Cable is compatible with several renowned brands, notably Cisco and Juniper. These compatibility features furthercable’se the cable’s versatility and adaptability, as they can be seamlessly integrated into existing network systems of these brands. Therefore, investing in these cables can significantly streamline network operatiyou’rehether Cisco’susing Cisco’s advanced networking Juniper’s or Juniper’s high-performance network infrastructure.

Technical Specifications of 400G Passive Direct Attach Copper Cable

Technical Specifications of 400G Passive Direct Attach Copper Cable

Cable Types

The 400G Passive Direct Attach Copper Cable is available in various combinations to suit a range of networking configurations, offering flexibility and scalability for network infrastructures.

  1. QSFP-DD to QSFP-DD: This configuration provides a robust connection between two QSFP-DD systems, ensuring high-speed data transfer and optimal network performance.
  2. QSFP-DD to 4x100G QSFP56: This cable configuration is an ideal choice for networks that require splitting a 400G connection into four 100G links. It brings about efficient data distribution and effective utilization of network resources.
  3. QSFP-DD to 8x50G SFP56: This cable type is perfect for scenarios where a single 400G link needs to be divided into eight separate 50G SFP56 connections. It provides a versatile solution for managing complex network setups and high-density applications.

These options demonstrate the flexibility of the 400G Passive Direct Attach Copper Cable, making it a valuable investment for businesses looking to enhance their network performance and scalability.

Length Options

The 400G Passive Direct Attach Copper Cable is versatile in terms of network configuration and provides flexibility in length options to cater to different spatial requirements. The cable is available in the following lengths:

  1. One meter: The shortest option available, this length is ideal for connections in compact spaces or between closely situated devices.
  2. Two meters: This length offers a balance of compact design and extended reach, perfect for medium-distance connections.
  3. Three meters: Providing a more extended reach, the 3-meter cable is suitable for connections spanning across larger spaces.
  4. Five meters: The most extended option available, this cable is designed for connections that need to cover significant distances or span across large network areas.

By offering cables in these various lengths, we ensure that you can achieve optimal network performance irrespective of the physical layout of your infrastructure.


The versatility of the 400G Passive Direct Attach Copper Cable extends to its compatibility with a wide range of devices. It seamlessly integrates with various platform models, einfrastructure’srastructure’s optimal performance. Notably, the cable is compatible with the following devices:

  1. QSFP-DD Compatible Devices: The 400G cable aligns perfectly with devices supporting the QSFP-DD (Quad Small Form Factor Pluggable Double Density) format. This compatibility allows for high-speed connections and efficient data transfer across your network.
  2. Cisco Compatible Devices: Network devices manufactured by Cisco, a pioneer in networking technology, are well-suited to the 400G Passive Direct Attach Copper Cable. This ensures robust and reliable connections within Cisco-based infrastructures.
  3. Juniper Compatible Devices: Juniper Networks, renowned for their high-performance networking equipment, also aligns well with our 400G cable. This compatibility enhances network efficiency and performance across Juniper-based systems.

This wide-ranging compatibility illustrates our commitment to providing flexible and efficient networking solutions that cater to diverse network environments.

Installation and Usage of 400G Passive Direct Attach Copper Cable

Installation and Usage of 400G Passive Direct Attach Copper Cable

Installation Process

Step 1: Preparing the Network Devices

Before beginning installation, power off your network devices to prevent any potential electric shocks or hardware damage. Ensure the devices you plan to connect are QSFP-DD, Cisco, or Juniper compatible and have available port space for the 400G Passive Direct Attach Copper Cable. 

Step 2: Connecting the Cable

Insert the 400G Passive Direct Attach Copper Cable into the appropriate ports on your network devices. Make sure the cable is firmly seated and secured in eacable’s. The cable’s design ensures a snug fit, providing an efficient and reliable connection.

Step 3: Verifying the Connection

Switch on your network devices and verify the connection. Most devices will have an indicator light to signify a successful relationship. Additionally, youdevice’s the device’s inbuilt network diagnostic tools to confirm if the 400G Passive Direct Attach Copper Cable is functioning correctly and if data is being transmitted successfully. 

Following these steps will ensure a smooth and efficient installation of your 400G Passive Direct Attach Copper Cable, enhancing the performance and reliability of your network infrastructure.

Best Practices for Usage

Proper Cable Routing and Management

Proper cable routing and management are critical for ensuring optimal performance and reliability of the 400G Passive Direct Attach Copper Cable. Avoid severe bends, twists, or stress on the cable. Neatly route the cables away from power lines or other sources of electromagnetic interference to maintain signal integrity.

Regular Cable Inspections

Regularly inspect your 400G Passive Direct Attach Copper Cable for signs of wear, tear, or damage. Early detection of potential issues can help prevent system failures or data loss. Also, check the cable connections regularly to ensure they are secure and the cables are firmly seated in their respective ports.

Maintaining Optimal Conditions for Cable Performance

Maintaining optimal operating conditions can significantly enhance the performance and lifespan of the 400G Passive Direct Attach Copper Cable. The cable should operate in a clean, dry environment with controlled temperature and humidity. Excessive heat, cold, or moisture can lead to cable degradation, adversely affecting its performance.

By adhering to these recommended best practices, you can ensure the maximum efficiency and longevity of your 400G Passive Direct Attach Copper Cable, leading to a more robust and reliable network infrastructure.

In conclusion, these best practices for using the 400G Passive Direct Attach Copper Cable are pivotal in maintaining optimal network performance and mitigating potential downtime. Proper cable handling, regular inspections, and suitable environmental conditions are the cornerstones of efficient cable management. Implementing these measures will invariably extend your cable’s lifespan and enhance your network infrastructure’s reliability. Remember, your network is as resilient as its weakest link – by caring for your lines, you ensure a strong, robust, and dependable network infrastructure.


  1. Cisco Systems Inc. (2021). 400G Passive Direct Attach Copper Cable [Data Sheet]. Retrieved from https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-741075.html
  2. Wang, J., & Chen, M. (2020). Effects of temperature and humidity on the lifespan of high-speed copper cables. Journal of Network and Systems Management, 28(2), 365-385.
  3. Smith, A. L. (2019). NBeginner’s A Beginner’s Guide to Understanding and Maintaining Networks. New York: McGraw-Hill Education.
  4. Johnson, F. (2021). Importance of regular inspection and maintenance of network cables. Network Magazine, 35(4O’Sullivan5. O’Sullivan, F., & Bai, J. (2020). Best practices for cable handling and management in high-speed networks. IEEE Transactions on Networking, 24(3), 567-589.
  5. Jacobs, K. (2018). The critical role of proper cable management in network infrastructure reliability. IT World Today,

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Frequently Asked Questions

A: The 400G Passive Direct Attach Copper Cable – QSFP-DD Compatible is a high-speed data cable used for networking purposes. It is designed to provide a direct connection between devices, ensuring fast and reliable data transmission.

A: QSFP-DD stands for Quad Small Form Factor Pluggable Double Density. It is a transceiver form factor designed for high-speed data transmission in networking applications.

A: A Direct Attach Cable (DAC) is a type of data cable that directly connects two networking devices without the need for additional transceivers. It is commonly used for short-distance communication within a data center.

A: Yes, the 400G QSFP-DD Cable is compatible with QSFP56 devices. It can provide a direct, high-speed connection between compatible devices.

A: The maximum length of the 400G QSFP-DD Cable may vary depending on the manufacturer. It is important to check the product specifications for the exact length options available.

A: A passive cable does not require any additional power or electronic components to transmit data, while an active cable may contain internal electronics for signal regeneration. In the case of the 400G QSFP-DD Cable, it is a passive cable.

A: Yes, the 400G QSFP-DD Cable can be used for breakout applications. It can be connected to a QSFP-DD port on one end and break out into multiple connections on the other end, such as 8x 50G SFP56 connections.

A: Yes, the 400G QSFP-DD Cable is compatible with Cisco networking equipment. It adheres to industry standards and can be used with Cisco compatible devices.

A: The warranty period for the 400G QSFP-DD Cable may vary depending on the manufacturer or supplier. It is recommended to check the product specifications or contact the seller for warranty information.

A: Yes, the 400G QSFP-DD Cable complies with industry standards, such as QSFP-DD MSA (Multi-Source Agreement) and Ethernet standards. It ensures compatibility and interoperability with other compliant devices.

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