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Arista

Arista CAB-Q-S-5M-Arista | 40G QSFP+ to 4x 10G SFP+ Breakout DAC Cable, 5m

CAB-Q-S-5M-Arista

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Description

The Arista CAB-Q-S-5M is a 40GBASE-CU passive direct attach copper breakout cable designed for cost-effective short-reach connectivity in data centers and enterprise networks. This 5-meter twinax cable features a QSFP+ connector on one end and four SFP+ connectors on the other, enabling seamless 40G to 4x10G connectivity. Compliant with MSA standards including SFF-8436 and SFF-8431, it requires no additional power and operates reliably over passive copper for rack-to-rack or equipment room interconnections.

Features

MSA-compliant QSFP+ and SFP+ connectors for broad platform compatibility
- Passive copper twinax design eliminates external power requirements
- 28 AWG twinax cable construction for flexibility and durability
- Four independent data channels supporting error-free 10G transmission per lane
- Suitable for spine-to-leaf, aggregation, and high-density top-of-rack deployments
- Pre-programmed EEPROM for seamless integration with Arista platforms
- Low latency and high reliability for mission-critical data center applications
- Cost-effective alternative to optical transceivers for short-reach connectivity
- Hot-swappable design for easy installation and maintenance
- Compliant with industry standards including SFF-8436 and SFF-8431

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) Twinax Breakout
- Data Rate: 40GBASE-CU, breakout to 4x 10GBASE-CU
- Connectors: 1x QSFP+ to 4x SFP+
- Cable Length: 5 meters (16.4 ft)
- Cable Gauge: 28 AWG
- Compliance: MSA SFF-8436 (QSFP+), SFF-8431 (SFP+)
- Power Requirement: Passive (no external power required)
- Operating Temperature: Commercial (0°C to 70°C)
- Use Case: Short-reach interconnections for 40G to 10G breakout applications

FAQs

Q: What devices is the CAB-Q-S-5M compatible with?
A: This cable is designed for Arista networking equipment with QSFP+ 40G ports and SFP+ 10G ports. It enables a single 40G QSFP+ port to connect to four separate 10G SFP+ ports, ideal for spine-to-leaf or aggregation layer connectivity in data center environments.

Q: What is the difference between passive and active DAC cables?
A: Passive DAC cables like the CAB-Q-S-5M do not require external power and use copper twinax without signal amplification, making them cost-effective for distances up to 5-7 meters. Active cables include signal boosting circuitry for longer reaches but consume more power and cost more.

Q: Can I mix this cable with other vendors' equipment?
A: While this cable is programmed specifically for Arista platforms, MSA-compliant DAC cables can often work across vendors. However, compatibility depends on EEPROM coding and vendor support policies. Always verify compatibility with your specific switch models before deployment.

Q: What are the typical applications for 40G to 4x10G breakout cables?
A: Common applications include connecting 40G spine switches to multiple 10G leaf switches, aggregating 10G server connections, or providing flexible port density in top-of-rack deployments. This allows network operators to maximize port utilization and reduce costs by using existing 10G infrastructure.

Q: Does this cable support forward error correction (FEC)?
A: Passive copper DAC cables typically do not require FEC for error-free transmission at their specified cable lengths. The cable operates reliably at 40G or 4x10G speeds over 5 meters without additional error correction, though FEC settings are controlled by the connected switch ports.

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