• Arista cab-d-8s-400-2.5 metallic 400g qsfp-dd to 8x 50g sfp56 breakout dac cable with yellow latch and blue fiber cables
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Arista

Arista CAB-D-8S-400-2.5 | 400G QSFP-DD to 8x 50G SFP56 Breakout DAC Cable, 2.5m

Arista CAB-D-8S-400-2.5 | 400G QSFP-DD to 8x 50G SFP56 Breakout DAC Cable, 2.5m

CAB-D-8S-400-2.5

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Description

The Arista CAB-D-8S-400-2.5 is a 400GBASE-CR8 to 8x 50GBASE-CR passive Direct Attach Copper (DAC) breakout cable designed for high-density data centre interconnects. Running at 2.5 metres, this QSFP-DD to 8x SFP56 twinax cable delivers a cost-effective, low-latency solution for fanout connectivity between 400G spine switches and 50G server or leaf switch ports — ideal for Arista 7800, 7500, and 7300 series platforms. It eliminates the need for optics and transceivers, reducing both power consumption and total cost of ownership in large-scale fabric deployments.

This passive copper DAC cable is fully compliant with IEEE 802.3cd standards and supports plug-and-play installation with no additional configuration required. Compatible with Arista EOS-based switching platforms, it delivers consistent signal integrity across the full 2.5m reach. Buy today from iptrading.com.au — fast shipping and expert service across Australia.

Features

- 400G aggregate bandwidth via 8x 50G breakout lanes — maximises port density in data centre fabrics
- Passive DAC construction — zero active components means lower power draw and reduced heat generation
- QSFP-DD to 8x SFP56 fanout — ideal for connecting spine switches to multiple 50G endpoints
- Plug-and-play installation — no configuration, drivers, or firmware required
- IEEE 802.3cd compliant — interoperability with standard 50GBASE-CR and 400GBASE-CR8 infrastructure
- PAM4 signalling — delivers high-speed data transmission with strong signal integrity at 2.5m
- Cost-effective alternative to optical transceivers — eliminates need for separate optics and fibre patching
- Purpose-built for Arista EOS platforms — validated for use with Arista 7800, 7500, and 7300 series switches

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: QSFP-DD (400G)
- Connector B: 8x SFP56 (50G each)
- Data rate: 400G aggregate (8x 50GBASE-CR)
- Cable length: 2.5 metres
- Standard: IEEE 802.3cd compliant
- Encoding: PAM4
- Power consumption: Passive (no active components)
- Form factor: Breakout / fanout configuration
- Compatible platforms: Arista 7800, 7500, 7300 series (EOS)

FAQs

Q: What is the CAB-D-8S-400-2.5 used for?
A: This cable is a 400G QSFP-DD to 8x 50G SFP56 breakout DAC, used for high-density fanout connectivity in data centres — typically connecting a 400G spine or aggregation switch port to eight individual 50G server NICs or leaf switch ports within short distances.

Q: Is this an active or passive cable?
A: The CAB-D-8S-400-2.5 is a passive Direct Attach Copper (DAC) twinax cable. It contains no active electronic components, resulting in lower power consumption, reduced latency, and lower cost compared to active optical cable (AOC) alternatives.

Q: Which Arista switches are compatible with this cable?
A: This cable is designed for use with Arista EOS-based platforms that feature QSFP-DD ports, including the Arista 7800, 7500R3, and 7300X3 series switches. Always verify compatibility with your specific switch model and EOS software version.

Q: Can this cable be used with non-Arista equipment?
A: While the cable is an Arista-branded DAC and is optimised for Arista platforms, it uses standard QSFP-DD and SFP56 form factors. Compatibility with third-party equipment is not guaranteed — contact IP Trading for guidance on your specific deployment.

Q: Can I purchase this cable in Australia through IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware reseller offering the Arista CAB-D-8S-400-2.5 with fast shipping and expert pre-sales and post-sales support across Australia.

Q: What is the maximum supported cable length?
A: This specific SKU supports a 2.5 metre reach. Passive DAC cables are generally suited for short in-rack or top-of-rack connections. For longer distances, active optical cables (AOC) or transceiver-based solutions should be considered.

Datasheet

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