• 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-1M | 400G QSFP-DD to 4x100G QSFP56 | 400GBASE-CR8 breakout to 4x 100GBASE-CR2 | wavelength: N/A (passive copper) | reach 1 m | direct-attach twinax | connectors: QSFP-DD to 4x QSFP56

CAB-D-4Q-400G-1M

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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) on the 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

- Cost-optimized 400G-to-4x100G fan-out
- Ultra-low latency and ultra-low power
- PAM4-ready electrical performance (CR8/CR2)
- Reliable short-reach connectivity (1 m)
- Hot-pluggable, MSA-compliant interfaces
- Ideal for high-density spine/leaf 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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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: 1 meter
- 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

FAQs

Q: Will this work with my 400G switch?
A: Yes, if the 400G QSFP-DD port supports 4x100G breakout (CR8 to CR2). Enable breakout according to your switch OS.

Q: Do the 100G ends require QSFP56 ports?
A: Yes, 100GBASE-CR2 uses 2x50G PAM4 signaling typically on QSFP56 ports.

Q: Is this an active cable?
A: No, it is a passive twinax DAC requiring no external power.

Q: Is vendor coding enforced?
A: Some platforms require specific coding. Verify your device accepts this cable’s coding or use matching-coded cables.

Q: What distances are supported?
A: This model is 1 meter. Passive DACs are typically available up to ~2.5–3 meters depending on gauge and platform.

Q: Does it reduce latency compared to optics?
A: Yes, passive copper provides extremely low latency versus optical modules.

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