Arista

Arista CAB-D-D-400G-1M | 400G QSFP-DD to QSFP-DD | 400GBASE-CR8 | Passive Twinax DAC | 1 m reach | IEEE 802.3cd | 8x50G PAM4

Arista CAB-D-D-400G-1M | 400G QSFP-DD to QSFP-DD | 400GBASE-CR8 | Passive Twinax DAC | 1 m reach | IEEE 802.3cd | 8x50G PAM4

SKU:CAB-D-D-400G-1M

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Description

Passive direct-attach copper (DAC) for short-reach 400GbE links between QSFP-DD ports; ultra-low latency and near-zero power for TOR/leaf-spine connections up to 1 m.

Features

- Cost-effective short-reach 400G connectivity
- Ultra-low latency and jitter
- Near-zero power consumption
- Robust EMI immunity and durable twinax construction
- Plug-and-play with compatible QSFP-DD ports

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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FAQs

Technical Specifications

FAQs

Q: Is this a passive or active cable?
A: Passive twinax DAC; devices must support 400G DAC on QSFP-DD ports.

Q: Will this work in any QSFP-DD port?
A: Use in QSFP-DD ports that specifically support 400GBASE-CR8 DAC; device/OS support may be required.

Q: Can I connect QSFP28 or QSFP56 ports with this cable?
A: No. This is QSFP-DD to QSFP-DD for 400G; it requires QSFP-DD ports.

Q: What is the typical maximum length for passive 400G DAC?
A: Commonly up to 2–2.5 m depending on gauge and platform; this assembly is 1 m.

Q: Does it add measurable latency?
A: Latency is negligible compared to optical links; ideal for short intra-rack runs.

Technical Specifications

- Data rate: 400 GbE aggregate
- Form factor: QSFP-DD (8 lanes) to QSFP-DD
- Base standard: 400GBASE-CR8 (IEEE 802.3cd)
- Signaling: PAM4, 8x50G lanes
- Cable type: Passive twinax copper (DAC)
- Length: 1 meter
- Reach: Up to 1 m passive
- Power: Near-zero (passive, <0.1 W per end)
- Management/ID: CMIS (QSFP-DD)
- Operating temperature: 0 to 70°C (commercial)
- Compliance: RoHS
- Typical applications: TOR/leaf-spine, switch-to-switch within rack or adjacent rack

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