Arista

Arista CAB-D-D-400G-2M | 400G QSFP-DD to QSFP-DD | 400GBASE-CR8 | Passive Twinax DAC | 2 m reach | IEEE 802.3cd | 8x50G PAM4

Arista CAB-D-D-400G-2M | 400G QSFP-DD to QSFP-DD | 400GBASE-CR8 | Passive Twinax DAC | 2 m reach | IEEE 802.3cd | 8x50G PAM4

SKU:CAB-D-D-400G-2M

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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 m.

Features

- Affordable alternative to optical modules for short reach
- Minimal latency with direct copper connection
- Energy efficient operation
- Reliable signal integrity over 2 m
- Tool-less, 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: Is it passive and vendor-coded?
A: It is a passive DAC; device-side compatibility and coding support are required for proper operation.

Q: Do I need to configure the port?
A: Most platforms auto-detect DACs; ensure the port supports 400G DAC and is enabled in the NOS.

Q: Can this replace an optical transceiver?
A: Yes for short distances; DACs are intended for very short-reach in-rack or adjacent-rack links.

Q: What about bend radius?
A: Avoid sharp bends; follow platform and cable handling guidelines to maintain signal integrity.

Q: Is it hot-swappable?
A: Yes, QSFP-DD DACs are hot-swappable in compatible cages.

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 meters
- Reach: Up to 2 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, adjacent rack interconnects

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