Arista

Arista CAB-D-4Q-400G-2M | 400G QSFP-DD to 4x100G QSFP56 | 400GBASE-CR8 breakout to 4x 100GBASE-CR2 | wavelength: N/A (passive copper) | reach 2 m | direct-attach twinax | connectors: QSFP-DD to 4x QSFP56

Arista CAB-D-4Q-400G-2M | 400G QSFP-DD to 4x100G QSFP56 | 400GBASE-CR8 breakout to 4x 100GBASE-CR2 | wavelength: N/A (passive copper) | reach 2 m | direct-attach twinax | connectors: QSFP-DD to 4x QSFP56

SKU:CAB-D-4Q-400G-2M

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Description

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

Features

- Efficient 400G-to-4x100G fan-out at 2 m reach
- Ultra-low latency and power
- Ready for PAM4-based 100G (CR2) legs
- Hot-pluggable, standards-compliant design
- Reliable short-reach performance for dense fabrics

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 cable passive?
A: Yes, it is a passive twinax DAC with very low latency and no external power draw.

Q: What breakout mode is required on the switch?
A: 4x100G breakout must be supported and enabled on the QSFP-DD 400G port.

Q: Are the 100G legs QSFP56?
A: Yes, 100GBASE-CR2 operates over QSFP56 electrical interfaces using 2x50G PAM4 per leg.

Q: Can I mix vendors on either end?
A: Potentially, but many devices use vendor-specific coding. Confirm compatibility with your platform.

Q: What is the reach of this model?
A: 2 meters, suitable for intra-rack or adjacent-rack connections.

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 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: Leaf/spine fan-out or TOR to multiple 100G endpoints

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