Arista

Arista CAB-D-D-400G-2.5 | 400G QSFP-DD to QSFP-DD | 400GBASE-CR8 | Passive Twinax DAC | 2.5 m reach | IEEE 802.3cd | 8x50G PAM4

Arista CAB-D-D-400G-2.5 | 400G QSFP-DD to QSFP-DD | 400GBASE-CR8 | Passive Twinax DAC | 2.5 m reach | IEEE 802.3cd | 8x50G PAM4

SKU:CAB-D-D-400G-2.5

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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 2.5 m.

Features

- Extends passive 400G DAC reach to 2.5 m
- Ultra-low latency and power
- High reliability for dense data center wiring
- EMI-resistant twinax construction
- Simple, plug-and-play deployment

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: What platforms is this suitable for?
A: Any switch, router, or NIC with QSFP-DD ports that support 400GBASE-CR8 passive DAC.

Q: Is this cable active equalized?
A: No, it is passive; equalization is provided by the host PHY.

Q: Does it support auto-negotiation?
A: 400G DAC operation is host-controlled; check your platform’s NOS for link training/AN support.

Q: Can I mix this with optical breakout?
A: Not applicable; this is a straight 400G to 400G copper assembly.

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: 2.5 meters
- Reach: Up to 2.5 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: In/adjacent-rack 400G interconnects

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