• Silver-colored sfp+ transceiver modules with blue plastic handles and metallic connectors for arista 400g qsfp-dd breakout cable
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Arista

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

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

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

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Description

The CAB-D-4Q-400G-2M is a 400GBASE-CR8 passive direct attach copper (DAC) breakout cable designed for high-density data centre interconnects, splitting a single QSFP-DD 400G port into four independent 100GBASE-CR2 QSFP ports over a 2-metre run. Built on 8 x 50G PAM-4 electrical lanes at the QSFP-DD end — with each QSFP breakout utilising 2 x 50G PAM-4 lanes — it delivers full 400G aggregate bandwidth with zero active components, minimising power draw and heat load in tightly packed spine-leaf and top-of-rack deployments.

As part of Arista's 400G QSFP-DD Twinax Copper Cable series, the CAB-D-4Q-400G-2M integrates seamlessly with Arista EOS (minimum version 4.23.0) and CloudVision for plug-and-play operation with no additional configuration. The passive copper construction ensures reliability and cost efficiency for short-reach intra-rack and inter-rack connections. Hot-swappable for minimal service disruption. Available in multiple lengths including 1m, 2.5m, and 3m to suit varied rack configurations. Contact iptrading.com.au — your local source for enterprise-grade networking solutions.

Features

- 400G breakout: one QSFP-DD 400G port fans out to four independent 100G QSFP ports
- Passive copper construction — no active components, lower power and heat output
- 8 x 50G PAM-4 lanes on QSFP-DD end; 2 x 50G PAM-4 lanes per QSFP breakout
- Hot-swappable design for maximum uptime and simplified field servicing
- Compliant with industry open standards for interoperability
- Plug-and-play integration with Arista EOS (v4.23.0+) and CloudVision
- Optimised for short-reach intra-rack and inter-rack data centre connections
- Part of Arista's comprehensive 400G connectivity portfolio across QSFP-DD and OSFP form factors
- Available in multiple lengths (1m, 2m, 2.5m, 3m) for flexible rack and row deployment

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-D-4Q-400G-2M
- Cable Type: 400GBASE-CR8 Passive Twinax Copper DAC
- Connector End 1: QSFP-DD (Quad Small Form-factor Pluggable Double Density) — 400G
- Connector End 2: 4 x QSFP (100GBASE-CR2) — 4 x 100G
- Cable Length: 2 metre (6.6 ft)
- Electrical Lanes (QSFP-DD end): 8 x 50G PAM-4
- Electrical Lanes per QSFP (breakout end): 2 x 50G PAM-4
- Total Aggregate Bandwidth: 400G
- Cable Construction: Passive (no active components)
- Minimum Arista EOS Software Version: 4.23.0
- Form Factor: Hot-swappable

FAQs

Q: What does this cable connect and how does the breakout work?
A: The CAB-D-4Q-400G-2M connects a single QSFP-DD 400G port on one end to four individual QSFP 100G ports on the other end. The QSFP-DD side uses 8 x 50G PAM-4 electrical lanes, which are broken out into four QSFP connections each running 2 x 50G PAM-4 lanes, delivering 100G per QSFP port with a total aggregate bandwidth of 400G.

Q: Is this an active or passive cable, and does that matter for my deployment?
A: This is a passive direct attach copper (DAC) cable, meaning it contains no active electronic components. Passive DACs consume less power, generate less heat, and are more cost-effective than active optical cables for short-reach connections — making them ideal for intra-rack and adjacent inter-rack deployments within 2 metres.

Q: Which Arista switches and EOS versions are compatible with this cable?
A: The CAB-D-4Q-400G-2M requires Arista EOS version 4.23.0 or later. It is designed for use with Arista switches featuring QSFP-DD 400G ports (such as the 7800, 7500R3, and 7050CX3 series) and is fully integrated with Arista CloudVision for automated management and visibility.

Q: Can I use this cable in a spine-leaf data centre architecture?
A: Yes. This breakout cable is purpose-built for high-density spine-leaf and top-of-rack data centre architectures where a 400G spine switch port needs to be fanned out to multiple 100G leaf switch uplinks — maximising port utilisation and reducing cabling costs without active optics.

Q: Are other lengths available for this cable type?
A: Yes. Arista's 400G QSFP-DD to 4 x 100G QSFP DAC breakout cable series is available in 1m, 2m, 2.5m, and 3m lengths. Contact iptrading.com.au to enquire about other lengths or bulk pricing for your data centre project.

Q: Can I purchase this Arista DAC cable in Australia through IP Trading?
A: Yes. IP Trading (iptrading.com.au) is a specialist Australian B2B IT hardware reseller stocking Arista networking products including DAC and breakout cables. Contact us for pricing, lead times, and volume discounts for enterprise and data centre deployments across Australia.

Datasheet

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