Arista

Arista CAB-Q-S-0.5M | 4x10G | QSFP+↔4xSFP+ | 40GBASE-CR4 breakout | n/a | 0.5m | passive twinax DAC

Arista CAB-Q-S-0.5M | 4x10G | QSFP+↔4xSFP+ | 40GBASE-CR4 breakout | n/a | 0.5m | passive twinax DAC

SKU:CAB-Q-S-0.5M

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Description

Passive 40G QSFP+ to 4×10G SFP+ breakout direct-attach copper (DAC) cable, 0.5 meter. Converts one QSFP+ 40G port into four independent 10G lanes for TOR aggregation or server NIC fan-out. Compliant with IEEE 802.3ba 40GBASE-CR4 breakout/10GBASE-CR, QSFP+ MSA (SFF-8436) and SFP+ MSA (SFF-8431). Ultra‑low latency, near‑zero power, and secure latching connectors on all ends.

Features

- Breakout fan‑out: QSFP+ 40G to four independent 10G links
- Passive copper twinax for low latency and low power
- Standards-compliant with QSFP+/SFP+ MSAs
- Secure latching on all connectors
- Ideal for TOR aggregation and server NIC 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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FAQs

Technical Specifications

FAQs

Q: Does my switch need to support breakout?
A: Yes. The QSFP+ port and platform must support 4×10G breakout for this cable to function as four independent 10G links.

Q: Is this an active or passive cable?
A: It is a passive twinax DAC.

Q: What devices can connect to the SFP+ ends?
A: Any 10G SFP+ port that supports passive DAC, such as server NICs or switch 10G ports.

Q: Is there an optical wavelength?
A: No, it is copper twinax with no optics or wavelength.

Technical Specifications

- Interface speed: 4×10 Gbps (breakout from 40G)
- Cable type: Passive copper twinax, direct-attach (DAC)
- Form factor/connectors: QSFP+ male to 4× SFP+ male
- Length: 0.5 meter
- Standards: IEEE 802.3ba 40GBASE-CR4 breakout; 10GBASE-CR; SFF-8436 (QSFP+); SFF-8431 (SFP+)
- Power: Passive, near-zero power consumption
- Latency: Ultra-low, no optical conversion
- Use case: Fan-out from a 40G QSFP+ port to four 10G endpoints
- Compatibility: Requires QSFP+ port and platform that support 4×10G breakout

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