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

Arista CAB-D-4Q-400G-3M | 400G QSFP-DD to 4x 100G QSFP DAC Breakout Cable, 3m

Arista CAB-D-4Q-400G-3M | 400G QSFP-DD to 4x 100G QSFP DAC Breakout Cable, 3m

CAB-D-4Q-400G-3M

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Description

The Arista CAB-D-4Q-400G-3M is a 400GBASE-CR8 to 4x 100GBASE-CR2 QSFP-DD breakout direct-attach copper (DAC) twinax cable designed for high-density data centre interconnects. This 3-metre passive copper assembly breaks a single 400G QSFP-DD port out into four independent 100G QSFP28 connections, making it ideal for spine-to-leaf cabling, top-of-rack deployments, and migration scenarios where 100G servers or downstream switches need to connect to a 400G-capable spine switch or router.

Engineered for compatibility with Arista 400G-capable platforms — including the 7800, 7500R3, 7300X3, and 7050X4 series — this passive DAC cable delivers low latency and power-efficient connectivity without the cost of optical transceivers. The twinax construction provides reliable signal integrity over the 3-metre reach suited to intra-rack and adjacent-rack runs. Need it fast? iptrading.com.au delivers across Australia — shop now.

Features

- Breakout design: splits one 400G QSFP-DD port into four 100G QSFP28 ports for flexible spine-to-leaf cabling
- Passive twinax copper construction — no power draw, low latency, high signal integrity
- 3-metre reach suits intra-rack and adjacent-rack data centre deployments
- Eliminates the cost and complexity of optical transceivers for short-distance 100G/400G interconnects
- Supports 400GBASE-CR8 and 100GBASE-CR2 electrical standards
- Plug-and-play installation with no additional configuration required
- Validated for use with Arista 400G switching and routing platforms
- Ideal for data centre migration scenarios moving from 100G to 400G infrastructure

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 twinax copper (DAC)
- Host-side connector: 400GBASE-CR8 QSFP-DD (1x 400G)
- Remote-side connectors: 4x 100GBASE-CR2 QSFP28 (4x 100G breakout)
- Cable length: 3 metres
- Electrical interface: CR8 (host) / CR2 x4 (remote)
- Form factor: Breakout / fanout configuration
- Power: Passive — no active components, minimal power draw
- Compatibility: Arista 400G-capable platforms (7800, 7500R3, 7300X3, 7050X4 series and others)
- Operating temperature: 0°C to 70°C (standard data centre range)

FAQs

Q: What does the CAB-D-4Q-400G-3M cable do?
A: It breaks a single 400G QSFP-DD port into four independent 100G QSFP28 connections using a passive twinax copper cable. This is ideal for connecting a 400G spine switch to four separate 100G leaf switches or servers without using optics.

Q: Is this an active or passive cable?
A: This is a passive direct-attach copper (DAC) cable, meaning it requires no power or active components. It relies on the host ports for signal driving and is suited for short reaches up to 3 metres.

Q: Which Arista platforms is this cable compatible with?
A: The CAB-D-4Q-400G-3M is designed for Arista 400G-capable switches and routers, including the 7800 Series, 7500R3 Series, 7300X3 Series, and 7050X4 Series. Always verify platform compatibility in the Arista transceiver compatibility matrix.

Q: Can I use this cable with non-Arista switches?
A: This cable is an Arista-branded assembly optimised and validated for Arista hardware. While the physical connectors are industry-standard QSFP-DD and QSFP28, compatibility with third-party switches is not guaranteed and should be tested prior to deployment.

Q: Why choose a DAC cable over optical transceivers for this connection?
A: Passive DAC cables offer lower cost, near-zero power consumption, and lower latency compared to active optical solutions. For intra-rack or short adjacent-rack runs up to 3 metres, DAC is the most cost-effective and reliable choice.

Q: Can I purchase this Arista cable in Australia through IP Trading?
A: Yes. IP Trading is an Australian B2B IT hardware reseller stocking Arista networking cables and accessories. The CAB-D-4Q-400G-3M is available for prompt dispatch across Australia — visit iptrading.com.au to order or enquire.

Datasheet

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