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Arista

Arista CAB-Q-4S-100G-1M-Arista | 100G to 4x25G Breakout DAC Cable, Passive, 1m

CAB-Q-4S-100G-1M-Arista

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Description

The Arista CAB-Q-4S-100G-1M is a 1-meter passive direct attach copper breakout cable designed for high-speed data center interconnects. It connects a single 100G QSFP28 port to four 25G SFP28 ports, enabling efficient network architecture where 100G ToR switches interface with multiple 25G devices. This cost-effective passive twinax solution eliminates the need for transceivers while delivering reliable performance for short-reach applications up to 1 meter.

Features

Passive twinax copper technology eliminates power consumption and reduces heat generation
- Breaks out one 100G QSFP28 connection into four independent 25G SFP28 links
- Compliant with IEEE 802.3bj 100GBASE-CR4 and SFF-8402/SFF-8665 MSA standards
- Hot-pluggable design supports maintenance and upgrades without system downtime
- 30 AWG gauge provides flexibility while maintaining signal integrity
- Cost-effective alternative to optical transceivers and fiber for short-reach connections
- Low latency and high reliability for data center and enterprise applications
- Fully tested for compatibility with Arista QSFP28 and SFP28 platforms
- Commercial temperature rating suitable for standard data center environments
- Plug-and-play installation with no additional configuration required

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: 100GBASE-CR4 QSFP28 to 4x 25GBASE-CR SFP28 Passive Direct Attach Copper Breakout
- Cable Length: 1 meter (3.28 feet)
- Connector A: 1x 100G QSFP28 Male
- Connector B: 4x 25G SFP28 Male
- Cable Technology: Passive Twinax Copper
- Wire Gauge: 30 AWG
- Data Rate: 100 Gbps aggregate (4x 25 Gbps lanes)
- Compliance Standards: IEEE 802.3bj 100GBASE-CR4, SFF-8402, SFF-8665
- Temperature Range: Commercial (0°C to 70°C)
- Power Consumption: No external power required (passive)
- Hot-Pluggable: Yes

FAQs

Q: What is the primary use case for this breakout cable?
A: This breakout cable is ideal for connecting a 100G QSFP28 port on a top-of-rack switch to four separate 25G SFP28 devices such as servers, storage arrays, or lower-tier switches. It enables efficient bandwidth distribution in data center leaf-spine architectures and high-density server deployments.

Q: Is this cable compatible with all Arista switches that support QSFP28 and SFP28?
A: Yes, the CAB-Q-4S-100G-1M is compatible with Arista switches featuring 100G QSFP28 ports and devices with 25G SFP28 ports. It works with Arista 7000, 7050, 7060, 7280, and 7500 series platforms that support these form factors. Always verify port compatibility in your specific switch datasheet.

Q: What are the advantages of passive DAC cables over active cables or fiber optics?
A: Passive DAC cables offer lower cost, zero power consumption, and reduced latency compared to active cables or fiber transceivers. They are ideal for short-reach connections up to 1-3 meters within racks or adjacent racks, providing reliable performance without additional cooling requirements or complexity.

Q: Can I use this cable to connect non-Arista equipment?
A: While this cable is coded for Arista equipment, many compatible alternatives work with multi-vendor environments. However, for guaranteed compatibility and to avoid potential issues with digital diagnostics or EEPROM coding, it is recommended to use vendor-specific or MSA-compliant cables tested for your specific equipment.

Q: What is the maximum distance supported by this passive breakout cable?
A: This passive copper breakout cable is designed for 1-meter connections. Passive copper DAC technology is generally reliable for distances up to 3 meters, though longer cables may require active copper or fiber optic solutions to maintain signal integrity at 100G/25G speeds.

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