• Silver-colored Arista CAB-Q-4S-100G-5M sfp+ transceiver modules with blue handles and metallic connectors for 100G QSFP28 breakout cable
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Arista

Arista CAB-Q-4S-100G-5M | 100G QSFP28 to 4x 25G SFP28 DAC Breakout Cable, 5m

Arista CAB-Q-4S-100G-5M | 100G QSFP28 to 4x 25G SFP28 DAC Breakout Cable, 5m

CAB-Q-4S-100G-5M

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Description

The Arista CAB-Q-4S-100G-5M is a 5-metre passive Direct Attach Copper (DAC) breakout cable that fans a single 100G QSFP28 port out to four independent 25G SFP28 ports. Designed for high-density data centre spine-leaf and top-of-rack interconnects, it delivers 100GBASE-CR4 aggregate throughput across four 25GBASE-CR lanes with no active electronics — reducing power draw and cost compared to active optical cables. Full IEEE 802.3 compliance and SFF-8636 EEPROM support ensure correct identification by Arista EOS 4.18.0+ switches.

This passive copper cable is RoHS compliant and operates across a commercial temperature range of 0°C to 70°C, drawing no more than 1.5W per end. It is compatible with Arista's spine-leaf data centre platforms and supports seamless 100G-to-4x25G breakout for maximising port density without optical transceivers. Available in multiple lengths within the CAB-Q-4S-100G series. Contact iptrading.com.au — your local source for enterprise-grade networking solutions.

Features

- Passive copper design — no active electronics, lower power and cost vs active optical cables
- Breakout capability: one 100G QSFP28 port fans out to four independent 25G SFP28 connections
- IEEE 802.3 100GBASE-CR4 and 25GBASE-CR compliant for broad interoperability
- SFF-8636 EEPROM compliant — ensures correct auto-identification on Arista EOS switches
- Supported on Arista EOS 4.18.0 and later software releases
- Ideal for high-density spine-leaf and top-of-rack data centre interconnects
- RoHS compliant — meets environmental and hazardous substance regulations
- Available in 1m, 2m, 3m, and 5m lengths within the CAB-Q-4S-100G series
- 1-year limited hardware warranty with optional next business day advance hardware replacement

Warranty

Arista hardware products come with a 1-year limited hardware warranty, covering defects in materials and workmanship under normal use.
Extended Warranty Options:
IP Trading offers tailored extended warranty solutions and support packages for Arista products. Contact our team to explore options that align with your organisation's needs.
https://www.arista.com/assets/data/pdf/Warranty.pdf

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Datasheet

Technical Specifications

- Part Number: CAB-Q-4S-100G-5M
- Cable Type: Passive Twinax Copper Direct Attach Cable (DAC)
- Connector End A: 1x QSFP28 (100G)
- Connector End B: 4x SFP28 (25G) — Breakout
- Cable Length: 5 metres (16.4 ft)
- Aggregate Data Rate: 100GBASE-CR4 (103.1 Gbps)
- Per-Lane Data Rate: 25GBASE-CR (25.7 Gbps per lane)
- Standard: IEEE 802.3 100GBASE-CR4 / 25GBASE-CR
- Management Interface: SFF-8636 EEPROM compliant
- EOS Software Support: EOS 4.18.0 and later
- Supply Voltage: 3.3V
- Power Consumption: Max 1.5W per end
- Operating Temperature: 0°C to +70°C (commercial)
- Compliance: RoHS

FAQs

Q: What does the CAB-Q-4S-100G-5M breakout cable actually do?
A: It splits a single 100G QSFP28 switch port into four independent 25G SFP28 connections, enabling 100G-to-4x25G breakout. This maximises port density in data centre spine-leaf or top-of-rack deployments without requiring additional optical transceivers.

Q: Is this cable active or passive, and why does it matter?
A: The CAB-Q-4S-100G-5M is a passive twinax copper cable — it contains no active electronics. This results in lower power consumption (max 1.5W per end), lower cost, and reduced complexity compared to active optical cables (AOCs), making it ideal for short-reach intra-rack and inter-rack connections up to 5 metres.

Q: Which Arista switches is this cable compatible with?
A: This cable is supported on Arista switches running EOS 4.18.0 or later. It is fully EEPROM-compliant per SFF-8636, ensuring correct auto-identification by the switch. It is suitable for use with Arista's 7050X, 7060X, 7260X, and similar platforms with 100G QSFP28 and 25G SFP28 ports.

Q: Can this cable be used with non-Arista switches or servers?
A: The cable complies with IEEE 802.3 100GBASE-CR4 and 25GBASE-CR standards, making it broadly compatible. However, Arista codes its transceivers and DAC cables for optimal identification on EOS platforms. Compatibility with third-party equipment should be verified prior to deployment.

Q: What other lengths are available in this cable series?
A: The CAB-Q-4S-100G series is available in 1m, 2m, 3m, and 5m lengths. The 5-metre variant (CAB-Q-4S-100G-5M) is suited for inter-rack runs, while shorter lengths are ideal for intra-rack connectivity.

Q: Can I purchase the Arista CAB-Q-4S-100G-5M in Australia from IP Trading?
A: Yes. IP Trading (iptrading.com.au) is a local Australian reseller of Arista networking products, including DAC cables and transceivers. Contact the team for pricing, availability, and volume procurement enquiries.

Datasheet

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