3m (10ft) 400G QSFP-DD DAC Cable
400G DAC cable（Direct Attached Cable） is a short distance, high speed data transmission solution for data centers, enterprises, and high performance computing environments. It mainly uses copper cable as the transmission medium, through the passive twisted pair design to realize the direct connection of data, usually used for interconnecting equipment within a rack or between neighboring racks.400G DAC cables are available in a variety of packages, including QSFP-DD/OSFP, which are able to meet the needs of different application scenarios.
| Part Number | Product | Data Rate | Length | Temp |
|---|---|---|---|---|
| GL4H-DQDY1xxxxM | 400G QSFP-DD to QSFP-DD DAC | 400Gbps | 0.5~3m | 0~70 ℃ |
| GL4H-DQDY2xxxxM | 400G QSFP-DD to 2*QSFP56 DAC | 400Gbps | 0.5~3m | 0~70 ℃ |
| GL4H-DOSY1xxxxM | 400G OSFP to OSFP DAC | 400Gbps | 0.5~3m | 0~70 ℃ |
| GL4H-DOSY2xxxxM | 400G OSFP to 2*QSFP56 DAC | 400Gbps | 0.5~3m | 0~70 ℃ |
- Switches, servers and routers
- Data Center networks
- Storage area networks
- High performance computing
- Telecommunication and wireless infrastructure
- Medical diagnostics and networking
- Test and measurement equipment
- Passive design requires little to no power, helping reduce data center energy costs.
- Supports aggregate data rates of 400Gbps(PAM4)
- Hot-swappable and easy to install, with no configuration required—reduces downtime during maintenance or upgrades.
- Ruggedized connectors and thick copper cable jacket ensure long service life and strong EMI protection.
- 28AWG through 30AWG cable
- Straight and break out assembly configurations available
- Customized cable braid termination limits EMI radiation
- Customizable EEPROM mapping for cable signature
- Fully compliant with QSFP-DD MSA (Multi-Source Agreement) and IEEE 802.3bs standards for 400G Ethernet.
FAQ About 400G DAC Cable
A 400G DAC cable directly connects two 400G ports using copper cabling with transceiver modules integrated at both ends—no separate optics are required.
400G DAC cables are typically available in lengths from 0.5 meters up to 3 meters. Some manufacturers may offer longer options, but signal attenuation and performance reliability become limiting factors beyond 3 meters.
The most common connector type is QSFP-DD (Quad Small Form Factor Pluggable Double Density). Variants may include QSFP-DD to QSFP-DD, or hybrid options such as QSFP-DD to 2x 200G QSFP56.
Not always. While QSFP-DD is a standard, compatibility depends on the vendor’s hardware and firmware. It’s essential to verify compatibility or request vendor-specific compatibility lists before purchase.
Yes, 400G DAC cables with QSFP-DD modules are typically hot-swappable, meaning they can be inserted or removed without powering down the device, provided the equipment supports hot-swapping.
You need devices that support 400G QSFP-DD ports, proper cooling, and power. Check your hardware specs and ensure your infrastructure supports 400G bandwidth and connector types.
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