• Silver-colored sfp+ transceiver modules with blue handles and metallic connectors for arista cab-d-4q-400g-1m breakout cable
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Arista

Arista CAB-D-4Q-400G-1M | 400G QSFP-DD to 4x 100G QSFP Breakout DAC Cable, 1m

Arista CAB-D-4Q-400G-1M | 400G QSFP-DD to 4x 100G QSFP Breakout DAC Cable, 1m

CAB-D-4Q-400G-1M

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Description

The Arista CAB-D-4Q-400G-1M 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 1-metre passive copper cable enables a single 400G QSFP-DD port to fan out into four independent 100G QSFP connections, making it ideal for spine-to-leaf cabling, server connectivity, and top-of-rack deployments where port density and cable management are critical. Built to industry-standard CR8/CR2 electrical specifications, it delivers low-latency, high-bandwidth connectivity without the cost or complexity of optical transceivers.

Engineered for compatibility with Arista 7000-Series and other QSFP-DD-capable platforms, this passive DAC assembly consumes minimal power and eliminates the need for optical-to-electrical conversion. The 1-metre length suits in-rack or short inter-rack runs in structured data centre environments. Available now at iptrading.com.au — competitive prices and local support.

Features

- 400G-to-4x100G breakout enables flexible spine-leaf and top-of-rack cabling architectures
- Passive twinax copper design delivers ultra-low latency with no signal conversion overhead
- Eliminates optical transceivers for short-reach connections, reducing cost and power consumption
- PAM4 modulation supports 8x 50G lanes (400G) and 2x 50G per 100G breakout (CR2)
- 1-metre length optimised for in-rack server and switch interconnects
- Compliant with IEEE 802.3bs and 802.3cd standards for broad interoperability
- Arista-branded and tested for assured compatibility with Arista 7000-Series platforms
- Plug-and-play installation — no software configuration required

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 Twinax Direct Attach Copper (DAC)
- Connector A: QSFP-DD (400GBASE-CR8)
- Connector B: 4x QSFP28 (100GBASE-CR2) breakout
- Aggregate bandwidth: 400G (8x 50G lanes on QSFP-DD side)
- Per-breakout bandwidth: 100G (2x 50G lanes per QSFP28)
- Cable length: 1 metre
- Modulation: PAM4
- Passive (no active components — low power consumption)
- Compliant with IEEE 802.3cd (100GBASE-CR2) and 802.3bs (400GBASE-CR8) standards
- Compatible with Arista 7000-Series and other QSFP-DD platforms

FAQs

Q: What does the CAB-D-4Q-400G-1M breakout configuration mean?
A: This cable breaks a single 400G QSFP-DD port (using 8x 50G lanes in CR8 mode) into four independent 100G QSFP28 connections (each using 2x 50G lanes in CR2 mode), allowing one high-speed port to connect to four separate 100G devices simultaneously.

Q: Is this an active or passive cable?
A: It is a passive direct attach copper (DAC) twinax cable. Passive DACs consume negligible power, generate less heat than optical solutions, and are highly reliable for short-distance data centre runs.

Q: What is the maximum supported cable length?
A: This variant is 1 metre, suited for in-rack or very short inter-rack connections. Passive DAC cables are typically limited to 1–3 metres; longer runs require active DAC or optical transceiver solutions.

Q: Which Arista platforms are compatible with this cable?
A: The CAB-D-4Q-400G-1M is designed for Arista switches and routers with QSFP-DD 400G ports, such as the Arista 7060X4, 7170, 7800, and other 400G-capable 7000-Series platforms. The QSFP28 breakout ends connect to any standard 100G QSFP28 port.

Q: Can I use this cable with non-Arista equipment?
A: The cable follows IEEE 802.3bs (400GBASE-CR8) and 802.3cd (100GBASE-CR2) standards, so it may be compatible with other vendors' QSFP-DD and QSFP28 ports. However, some switches use vendor-specific compatibility checks (port lock), so it is best verified against your specific platform's compatibility list.

Q: Can I purchase this cable in Australia from IP Trading?
A: Yes. The Arista CAB-D-4Q-400G-1M is available now at iptrading.com.au. IP Trading is an Australian B2B IT hardware reseller offering competitive pricing, local stock, and expert pre-sales support for data centre cabling and networking equipment.

Datasheet

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