400G QSFP-DD to 4×QSFP56 Direct Attach Copper Cable (DAC) – PAM4

• Supports aggregate data rates up to 400Gbps using PAM4 signaling
• QSFP-DD to 4×QSFP56 breakout configuration
• Enables 400G-to-4×100G connectivity
• Compatible with IEEE 802.3bj and IEEE 802.3cd
• Optimized construction for reduced insertion loss and crosstalk
• Pull-to-release slide latch design for easy installation and removal
• Available in 28AWG and 30AWG cable options
• Straight-through and breakout assembly configurations available
• Customized cable braid termination helps reduce EMI radiation
• Customizable EEPROM mapping for cable identification and system compatibility
• Single 3.3V power supply
• Operating temperature range of 0°C to +70°C
• RoHS compliant

• 400G switch-to-4×100G switch connections
• 400G data center switch breakout
• 400G-to-100G server connectivity
• Top-of-rack (ToR) switch deployments
• Spine-and-leaf data center networks
• High-performance computing (HPC) networks
• AI and GPU cluster interconnects
• High-density server and network equipment
• Short-distance rack and equipment connections

OEM and ODM customization is available to meet specific networking equipment and deployment requirements. Custom options can include cable length, cable gauge, labeling, EEPROM mapping, connector configuration, and other cable assembly specifications.

For high-volume deployments, customized cable construction and braid termination can also be provided to address specific mechanical, cable-management, and EMI requirements. EEPROM mapping can be programmed according to customer-defined cable identification and host-system compatibility requirements.

What is the purpose of a 400G to 4×100G breakout DAC?

It allows one 400G QSFP-DD port to connect to four independent 100G QSFP56 ports. This makes it useful when a high-speed 400G switch port needs to communicate with multiple 100G ports on other switches, servers, or network devices.

Are all four QSFP56 ends independent 100G connections?

Yes. The four QSFP56 ends correspond to separate 100G connections within the breakout architecture. However, the connected switch, network adapter, or other host equipment must support the appropriate 400G breakout mode.

What should be checked before using the cable with a switch?

The host equipment should support 400G QSFP-DD operation, the required breakout mode, and the appropriate electrical and management configuration. It is also important to verify that the switch supports 400G-to-4×100G breakout and recognizes the cable’s EEPROM information where required.

Why are both 28AWG and 30AWG options offered?

The two gauges provide different mechanical characteristics. 30AWG cable is thinner and more flexible, which can be advantageous in high-density racks with many cables, while 28AWG provides a more substantial cable construction. Selection should take cable length and installation density into account.

How does the cable support signal integrity at 400Gbps?

The cable assembly is optimized to control insertion loss and crosstalk, two important factors in high-speed electrical transmission. Proper cable construction and termination help maintain signal quality across the required electrical channels.

Can the cable be customized for specific switch platforms?

Yes. OEM customization can include cable length, cable gauge, EEPROM mapping, labeling, and other assembly requirements. Customized EEPROM information can be particularly useful when the cable needs to meet specific host-system identification requirements.