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Arista

Arista CAB-Q-4S-100G-3M-Arista | 100G QSFP28 to 4x 25G SFP28 Breakout Cable, 3m

CAB-Q-4S-100G-3M-Arista

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Description

The Arista CAB-Q-4S-100G-3M is a passive direct attach copper breakout cable designed for high-density data center deployments requiring cost-effective 100G to 4x25G connectivity. This 3-meter twinax cable connects a single 100G QSFP28 port to four independent 25G SFP28 ports, enabling flexible bandwidth allocation and seamless migration from 25G to 100G infrastructure. Ideal for top-of-rack switching, storage networking, and server connectivity in commercial temperature environments.

Features

Passive copper twinax construction for low power consumption and cost-effective short-reach connectivity
- Breakout architecture enabling one 100G port to connect to four independent 25G ports
- Hot-pluggable QSFP28 and SFP28 connectors for easy installation without downtime
- MSA compliant design ensures broad interoperability with multi-vendor platforms
- Supports 100GBASE-CR4 and 25GBASE-CU Ethernet standards for reliable data transmission
- Digital diagnostic monitoring (DDM) support via I2C interface for real-time cable health monitoring
- 3-meter reach ideal for intra-rack and adjacent-rack connectivity in data centers
- Low latency passive transmission eliminates signal processing delays
- Commercial temperature rating (0°C to 70°C) for standard data center environments
- RoHS and CE certified for environmental compliance and safety

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

Form Factor: QSFP28 to 4x SFP28 breakout cable
- Cable Type: Passive Direct Attach Copper (DAC) twinax
- Cable Length: 3 meters (9.8 feet)
- Data Rate: 100G QSFP28 (103.1 Gbps) to 4x 25G SFP28 (25.78 Gbps per lane)
- Standards Compliance: 100GBASE-CR4, 25GBASE-CU, IEEE 802.3, MSA SFF-8665
- Operating Temperature: 0°C to 70°C (commercial)
- Supply Voltage: 3.3V
- Power Consumption: Max 1.5W per connector end
- Cable Gauge: 28 AWG
- Connector Type: QSFP28 on one end, 4x SFP28 on the other
- Certifications: MSA compliant, RoHS, CE

FAQs

Q: What is the difference between this breakout cable and a standard 100G DAC?
A: This breakout cable splits one 100G QSFP28 connection into four independent 25G SFP28 connections, allowing you to connect a single 100G switch port to four separate 25G devices or ports. It provides greater flexibility for mixed-speed environments and incremental migration strategies compared to a standard point-to-point 100G DAC.

Q: Is this cable compatible with all Arista switches that have QSFP28 ports?
A: Yes, this cable is compatible with Arista switches featuring 100G QSFP28 ports. The cable's EEPROM is programmed for Arista platform recognition and has been tested for compatibility with current Arista networking equipment. Always verify your specific switch model supports breakout cable functionality.

Q: Can I use this cable in industrial or outdoor environments?
A: No, this cable is designed for commercial temperature environments (0°C to 70°C) and is intended for indoor data center or network closet deployments. For industrial or extended temperature applications, consider Arista's industrial-rated cabling solutions.

Q: What data rates does this breakout cable support?
A: The cable supports 100G Ethernet (103.125 Gbps) on the QSFP28 side and 4x 25G Ethernet (25.78 Gbps per lane) on the SFP28 side. It complies with 100GBASE-CR4 and 25GBASE-CU standards for maximum interoperability and performance.

Q: Does this passive cable require external power?
A: No, as a passive direct attach copper cable, it draws minimal power directly from the host switch ports (max 1.5W per end) and does not require external power supplies or active signal amplification, making it an energy-efficient choice for short-reach connections.

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