• Arista CAB-D-4Q-400-2.5 400G QSFP-DD to 4x100G QSFP DAC breakout cable 2.5m
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Arista

Arista CAB-D-4Q-400G-2.5 | 400G QSFP-DD to 4x100G QSFP56 | 400GBASE-CR8 breakout to 4x 100GBASE-CR2 | wavelength: N/A (passive copper) | reach 2.5 m | direct-attach twinax | connectors: QSFP-DD to 4x QSFP56

CAB-D-4Q-400G-2.5

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Description

High-density 400G-to-4x100G passive DAC breakout enabling ultra-low-latency, power-efficient short-reach links. QSFP-DD (CR8, 8x50G PAM4) on the host breaks out to four QSFP56 100G (CR2, 2x50G PAM4) legs—ideal for spine/leaf fan-out and TOR connections.

Features

- Cost-effective 400G-to-4x100G breakout at 2.5 m
- Ultra-low power and latency with passive twinax
- Robust PAM4 signal integrity for CR2 legs
- MSA-compliant, hot-swappable form factors
- Optimized for leaf/spine and TOR fan-out

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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Technical Specifications

FAQs

Technical Specifications

- Cable type: Passive Direct Attach Copper (DAC) breakout
- Aggregate data rate: 400 Gb/s
- Breakout: 4 x 100 Gb/s legs
- Host interface: QSFP-DD, 8 lanes (8x50G PAM4)
- Remote interfaces: 4 x QSFP56, each 2 lanes (2x50G PAM4)
- Ethernet standards: 400GBASE-CR8 to 4x 100GBASE-CR2
- Length: 2.5 meters
- Wavelength: N/A (copper)
- Latency: Ultra-low (passive copper)
- Power: Passive, no external power required
- Hot-swappable, MSA compliant (QSFP-DD & QSFP56)
- Management: SFF-8636 diagnostic/EEPROM
- Operating temperature: 0°C to 70°C (typical passive DAC range)
- Compliance: RoHS
- Use case: High-density fan-out across adjacent racks

FAQs

Q: What signaling is used on each side?
A: QSFP-DD side uses 8x50G PAM4 (400GBASE-CR8). Each QSFP56 leg uses 2x50G PAM4 (100GBASE-CR2).

Q: Is this suitable for adjacent rack connections?
A: Yes, the 2.5 m length is commonly used for intra- and adjacent-rack links.

Q: Do I need optics or power for this cable?
A: No. It is a passive copper DAC requiring no separate optics or power.

Q: Will it work with any 400G switch?
A: It requires 4x100G breakout support and compatible vendor coding on the switch.

Q: Can the 100G ends plug into QSFP28 ports?
A: No. These legs are QSFP56 electrical (CR2/PAM4). Use with QSFP56 100G ports.

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