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

Arista CAB-D-D-400-2.5 | 400G QSFP-DD Twinax DAC Cable, 400GBASE-CR8, 2.5m

Arista CAB-D-D-400-2.5 | 400G QSFP-DD Twinax DAC Cable, 400GBASE-CR8, 2.5m

CAB-D-D-400-2.5

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Description

The Arista CAB-D-D-400-2.5 is a 400GBASE-CR8 passive Twinax Direct Attach Copper (DAC) cable with QSFP-DD connectors on both ends, delivering 400 Gbps aggregate throughput via 8x 50Gbps PAM-4 electrical lanes. Purpose-built for short-reach data centre interconnects, it is ideal for rack-to-rack and top-of-rack 400G connections in high-density switching and high-performance computing environments. Its passive copper construction ensures ultra-low latency and minimal power consumption compared to active optical alternatives.

Compatible with Arista platforms supporting 400G QSFP-DD ports, this hot-swappable cable integrates seamlessly into Arista's 400GE optics, AOC, and cable ecosystem. The QSFP-DD form factor provides double-density port utilisation and straightforward field servicing without disrupting adjacent connections. Backed by a 1-Year Limited Hardware Warranty with optional advance replacement services. Upgrade your network with gear from iptrading.com.au — Australia's IT hardware specialists.

Features

- Passive Twinax copper construction delivers ultra-low latency and low power draw for short-reach 400G links
- Hot-swappable QSFP-DD form factor enables maximum uptime and straightforward field servicing
- 8x 50Gbps PAM-4 lane architecture provides full 400 Gbps aggregate bandwidth
- Designed for data centre rack-to-rack and top-of-rack 400G interconnects
- Compatible with Arista 400G QSFP-DD-enabled switching and routing platforms
- EEPROM programmed to identify signal format and maximum supported data rate to the host system
- Part of Arista's comprehensive 400GE optics, AOC, and cable 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-D-D-400-2.5
- PHY Standard: 400GBASE-CR8
- Connector Type: QSFP-DD to QSFP-DD
- Cable Type: Passive Twinax Copper (DAC)
- Cable Length: 2.5 metres
- Aggregate Data Rate: 400 Gbps
- Lane Configuration: 8 x 50 Gbps PAM-4 electrical lanes
- Form Factor: QSFP-DD (Quad Small Form-factor Pluggable Double Density)
- Wavelength: N/A (Copper)
- Available Series Lengths: 1m, 2m, 2.5m
- Warranty: 1-Year Limited Hardware Warranty

FAQs

Q: What is the 400GBASE-CR8 standard and how does it achieve 400 Gbps?
A: 400GBASE-CR8 uses 8 electrical lanes, each running at 50 Gbps using PAM-4 (Pulse Amplitude Modulation 4-level) signalling, to deliver an aggregate throughput of 400 Gbps over passive twinax copper cable. This makes it highly efficient for short-reach data centre interconnects.

Q: What is the maximum reach of the CAB-D-D-400-2.5?
A: This is a passive DAC cable with a fixed length of 2.5 metres, suitable for within-rack and adjacent-rack connections in data centres. For longer distances, active optical cables (AOC) or fibre transceivers would be required.

Q: Which Arista platforms are compatible with this cable?
A: The CAB-D-D-400-2.5 is compatible with Arista switches and routers that feature 400G QSFP-DD ports, such as the Arista 7500R3, 7280R3, and 7060X4 series. Arista recommends consulting the Arista Transceiver and Cable Guide for full platform compatibility confirmation.

Q: What are the advantages of a passive DAC cable over an active optical cable for short-reach 400G links?
A: Passive DAC cables require no optical-to-electrical conversion, resulting in lower latency, lower power consumption, and lower cost per port compared to active optical cables (AOC) or fibre transceivers. They are the preferred choice for short-reach connections of up to a few metres within or between adjacent racks.

Q: Can I purchase the Arista CAB-D-D-400-2.5 in Australia from IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware specialist and stocks Arista optics, cables, and networking equipment. Contact the team for pricing, availability, and volume procurement options.

Q: What warranty is included with the CAB-D-D-400-2.5?
A: Arista provides a 1-Year Limited Hardware Warranty covering parts, repair, or replacement with a 10 business day turnaround. Optional next business day and 4-hour advance hardware replacement services are also available for organisations requiring higher service levels.

Datasheet

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