• Silver-colored sfp plus transceiver modules with blue handles and metallic connectors for arista 400g osfp to 2x 200g qsfp28 dac breakout cable 2m
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Arista

Arista CAB-O-2Q-400G-2M | 400G OSFP to 2x 200G QSFP28 DAC Breakout Cable, 2M

Arista CAB-O-2Q-400G-2M | 400G OSFP to 2x 200G QSFP28 DAC Breakout Cable, 2M

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

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Description

The Arista CAB-O-2Q-400G-2M is a 2-metre passive Direct Attach Copper (DAC) breakout cable designed for high-density data centre interconnects. It splits a single 400GBASE-CR8 OSFP port into two independent 200GBASE-CR4 QSFP connections, each utilising 4 x 50G PAM-4 electrical lanes — ideal for spine-leaf fabric deployments where port density and cost efficiency are critical. The passive copper design eliminates active components, delivering ultra-low power consumption and latency compared to optical alternatives.

Fully MSA-compliant and hot-swappable, this cable integrates seamlessly with Arista's OSFP-based 400G switching platforms running EOS 4.23.0 or later. It is a cost-effective, plug-and-play solution for short-reach connections within the same rack or adjacent racks, eliminating the need for separate transceivers and patch cords. Buy today from iptrading.com.au — fast shipping and expert service across Australia.

Features

- Passive DAC design — no active components, minimal power draw and heat generation
- Breakout capability splits one 400G OSFP port into two independent 200G QSFP ports
- MSA-compliant for broad interoperability with industry-standard equipment
- Hot-swappable for zero-downtime servicing and simple cable management
- Optimised for high-density spine-leaf data centre interconnects
- Supported on Arista OSFP-based 400G platforms running EOS 4.23.0 or later
- Cost-effective alternative to optical transceivers for short-reach applications
- Part of Arista's comprehensive 1G to 400GE copper and fibre connectivity portfolio

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-2Q-400G-2M
- Cable Type: Passive Twinax Direct Attach Copper (DAC)
- Cable Length: 2 metres
- OSFP End: 1 x 400GBASE-CR8 OSFP connector
- QSFP End: 2 x 200GBASE-CR4 QSFP connectors
- Electrical Lanes: 8 x 50G PAM-4 (OSFP side); 4 x 50G PAM-4 per QSFP (breakout side)
- Total Bandwidth: 400 Gbps
- Form Factor: Breakout — 1 x 400G to 2 x 200G
- Minimum EOS Version: 4.23.0
- Available Lengths: 1M, 2M, 3M

FAQs

Q: What does the CAB-O-2Q-400G-2M actually do?
A: It is a passive DAC breakout cable that connects one 400GBASE-CR8 OSFP port on a switch to two separate 200GBASE-CR4 QSFP ports on downstream devices. This allows a single 400G port to serve two 200G connections simultaneously, maximising port utilisation in data centre environments.

Q: What Arista platforms and EOS versions support this cable?
A: The CAB-O-2Q-400G-2M is supported on Arista switches with OSFP-based 400G ports running EOS 4.23.0 or later. Check your specific platform's hardware compatibility matrix in Arista's documentation to confirm support.

Q: Is this cable compatible with non-Arista equipment?
A: The cable is MSA-compliant, meaning it adheres to industry-standard specifications for OSFP and QSFP connectors. While it is designed and validated for Arista platforms, it may work with other MSA-compliant equipment. We recommend verifying compatibility with your specific hardware vendor before deployment.

Q: Why choose a DAC cable over optical transceivers for this application?
A: Passive DAC cables are significantly more cost-effective than optical transceiver pairs plus fibre patch cords for short-reach connections (typically up to 3 metres). They consume less power, produce less heat, and require no additional optics — making them the preferred choice for rack-to-rack or in-rack data centre cabling.

Q: What other lengths are available for this cable?
A: The 400G OSFP to 2x 200G QSFP breakout DAC cable is available in 1M, 2M, and 3M lengths within Arista's portfolio. Contact IP Trading if you require a different length and we can advise on the correct part number.

Q: Can I purchase this Arista DAC cable in Australia from IP Trading?
A: Yes. iptrading.com.au is an authorised Australian B2B IT hardware reseller stocking Arista connectivity products. We offer fast shipping across Australia with expert pre-sales and post-sales support to help you select the right cable for your data centre deployment.

Datasheet

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