• Silver-colored sfp+ transceiver modules with blue handles and metallic connectors for arista 400g osfp to 4x 100g breakout cable
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Arista

Arista CAB-O-4Q-400G-2M | 400G OSFP to 4x 100G QSFP Breakout DAC Cable, 2m

Arista CAB-O-4Q-400G-2M | 400G OSFP to 4x 100G QSFP Breakout DAC Cable, 2m

CAB-O-4Q-400G-2M

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Description

The Arista CAB-O-4Q-400G-2M is a passive 400GBASE-CR8 Twinax Direct Attach Copper (DAC) breakout cable engineered for high-density, low-latency data centre interconnects. It splits a single 400G OSFP port into four independent 100GBASE-CR2 QSFP connections over a 2-metre length — making it an ideal solution for spine-to-leaf breakout cabling, top-of-rack deployments, and 400G migration scenarios where existing 100G infrastructure must be preserved.

Built on passive Twinax copper technology, this cable delivers ultra-low power consumption and minimal latency without the complexity of active optics. It is MSA compliant, hot-swappable, and fully supported on Arista EOS platforms from version 4.23.0 onwards. Part of Arista's extensive 400G connectivity portfolio — available in 1m, 2m, and 3m lengths — this cable suits Australian enterprises scaling their data centre fabric with confidence. Upgrade your network with gear from iptrading.com.au — Australia's IT hardware specialists.

Features

- Passive Twinax copper design delivers ultra-low power consumption and minimal latency
- 1-to-4 breakout functionality: one 400G OSFP port fans out to four 100G QSFP ports
- MSA (Multi-Source Agreement) compliant for broad interoperability
- Hot-swappable for maximum uptime and simplified field servicing
- Supports high-density 400GE data centre fabric deployments
- Ideal for short-reach rack-level interconnects in spine-to-leaf and top-of-rack architectures
- Part of Arista's comprehensive 400G connectivity portfolio (DACs, AOCs, and transceivers)
- Supported on Arista EOS version 4.23.0 and later

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-O-4Q-400G-2M
- Host End Interface: 400GBASE-CR8 OSFP
- Breakout End Interface: 4 x 100GBASE-CR2 QSFP
- Cable Type: Passive Twinax Copper Direct Attach Cable (DAC)
- Cable Length: 2 metres
- Aggregate Bandwidth: 400G (8 x 50G PAM-4 electrical lanes, OSFP end)
- Per-QSFP Bandwidth: 100G (2 x 50G PAM-4 electrical lanes)
- Minimum EOS Version: 4.23.0
- Available Lengths: 1m, 2m, 3m (CAB-O-4Q-400G-xM series)
- Compliance: MSA (Multi-Source Agreement) compliant
- Hot-Swappable: Yes

FAQs

Q: What does the Arista CAB-O-4Q-400G-2M connect?
A: This cable connects a single 400GBASE-CR8 OSFP port on one end to four 100GBASE-CR2 QSFP ports on the breakout end. It enables a 400G-capable switch port to simultaneously link to four separate 100G devices, making it ideal for data centre spine-to-leaf or top-of-rack breakout scenarios.

Q: Is this an active or passive cable?
A: The CAB-O-4Q-400G-2M is a passive Twinax copper DAC cable. Passive DACs consume less power than active optical cables or active DACs and introduce minimal latency, making them the preferred choice for short-reach, rack-level connections up to 2 metres.

Q: Which Arista platforms and EOS versions support this cable?
A: This cable is supported on Arista EOS platforms from version 4.23.0 onwards. It is compatible with Arista switches that feature OSFP or QSFP-DD 400G ports on the host end and QSFP 100G ports on the breakout end. Always verify port compatibility against your specific platform's hardware compatibility list.

Q: What lengths are available in this breakout cable series?
A: The CAB-O-4Q-400G-xM series is available in three lengths: 1 metre (CAB-O-4Q-400G-1M), 2 metres (CAB-O-4Q-400G-2M), and 3 metres (CAB-O-4Q-400G-3M), allowing flexibility for different rack spacing and cabling layout requirements.

Q: Can I purchase this Arista DAC cable in Australia from IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware specialist stocking Arista optics and cabling including the CAB-O-4Q-400G-2M. Contact the team for pricing, availability, and volume procurement enquiries.

Q: What warranty does the Arista CAB-O-4Q-400G-2M carry?
A: Arista provides a 1-Year Limited Hardware Warranty covering parts, repair, or replacement with a 10 business day turnaround. Optional enhanced support plans including Next Business Day and 4-Hour Advance Hardware Replacement are also available.

Datasheet

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