• Silver-colored sfp28 transceiver modules with blue handles and metallic connectors in arista 100g qsfp to 4x 25g breakout cable 1m
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Arista

Arista CAB-Q-4S-100G-1M | 100G QSFP to 4x 25G SFP28 DAC Breakout Cable, 1m

Arista CAB-Q-4S-100G-1M | 100G QSFP to 4x 25G SFP28 DAC Breakout Cable, 1m

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

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Description

The Arista CAB-Q-4S-100G-1M is a 100GBASE-CR4 QSFP28 to 4x 25GBASE-CR SFP28 direct-attach copper (DAC) breakout cable designed for high-density, low-latency interconnects in data centre environments. At 1 metre in length, it is ideal for top-of-rack switch-to-server connections, breakout deployments, and spine-leaf fabric cabling where a single 100G port is split into four independent 25G links — eliminating the need for optical transceivers and reducing both cost and power consumption.

Compatible with Arista 7000-series switches and other standards-compliant QSFP28 and SFP28 equipment, this passive twinax cable delivers reliable signal integrity at short distances with minimal insertion loss. It is a plug-and-play solution requiring no configuration or additional licensing. Get it now at iptrading.com.au — authentic hardware, reliable service.

Features

- Breakout design: splits one 100G QSFP28 port into four 25G SFP28 links for maximum port density
- Passive DAC twinax construction — zero power consumption, lower cost than optical alternatives
- Ultra-low latency: no signal conversion or active components in the signal path
- 1-metre length optimised for top-of-rack switch-to-server and inter-switch cabling
- Standards-compliant: IEEE 802.3by, SFF-8665, SFF-8431 for broad interoperability
- Plug-and-play installation — no drivers, firmware, or licensing required
- Authentic Arista hardware ensures full platform compatibility and TAC support eligibility

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

- Cable type: Passive Direct-Attach Copper (DAC) Twinax
- Connector A: QSFP28 (100G)
- Connector B: 4x SFP28 (25G) — breakout
- Protocol: 100GBASE-CR4 / 4x 25GBASE-CR
- Cable length: 1 metre
- Data rate: 100 Gbps aggregate (4x 25 Gbps)
- Compliance: IEEE 802.3by, SFF-8665, SFF-8431
- Form factor: Passive (no active components, no power required)
- Operating temperature: 0°C to 70°C (standard commercial range)
- Compatible with: Arista 7000-series and standards-compliant QSFP28/SFP28 platforms

FAQs

Q: What is the CAB-Q-4S-100G-1M used for?
A: It is a breakout DAC cable that splits a single 100G QSFP28 port into four independent 25G SFP28 connections. It is commonly used in data centres to connect a 100G switch port directly to four 25G server NICs or other SFP28 devices over short distances.

Q: Is this an active or passive cable?
A: This is a passive direct-attach copper (DAC) twinax cable. It requires no power and contains no active electronics, making it a cost-effective and low-latency option for short-reach interconnects up to 1 metre.

Q: Is it compatible with non-Arista switches?
A: The cable follows industry-standard QSFP28 and SFP28 MSA specifications (SFF-8665, SFF-8431) and IEEE 802.3by. While it is an Arista branded cable optimised for Arista platforms, it may be compatible with other vendors' standards-compliant equipment. Check your switch vendor's interoperability documentation to confirm.

Q: What is the maximum cable length for this product?
A: This specific SKU is 1 metre in length. Passive DAC breakout cables are generally suitable for distances up to 3–5 metres; for longer runs, active optical cable (AOC) alternatives are recommended.

Q: Can I purchase this cable in Australia from IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware reseller supplying authentic Arista networking components including DAC and AOC cables. Contact the team for pricing, stock availability, and volume orders.

Q: Does this cable require any configuration or licensing?
A: No. The CAB-Q-4S-100G-1M is a plug-and-play passive cable. No software configuration, firmware, or additional licensing is required — simply connect it to compatible QSFP28 and SFP28 ports.

Datasheet

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