• Arista ADPT-O-Q-100G OSFP-to-QSFP28 100G adapter with silver SFP+ modules
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Arista

Arista CAB-D-2Q-400-2.5 | 400G QSFP-DD to 2x 200G QSFP56 DAC Cable, 2.5m

CAB-D-2Q-400-2.5

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Description

This Arista passive twinax copper breakout cable connects one 400G QSFP-DD port (400GBASE-CR8) to two 200G QSFP56 ports (200GBASE-CR4) over a 2.5 metre run. It is built for short-reach top-of-rack and adjacent-rack data centre links, where a 400G switch port needs to feed two 200G devices or switch ports without the cost of optical transceivers.

The host end uses a QSFP-DD connector carrying 8x50G PAM4 lanes, split into two QSFP56 connectors, each running 200GBASE-CR4. Construction is passive twinax copper, so there is no separate power supply and no wavelength to match. The cable is hot swappable and complies with IEEE 802.3 Ethernet and MSA standards. Certifications include CE, KCC, RCM and UKCA, along with RoHS and WEEE compliance.

The QSFP-DD end is intended for 400G QSFP-DD ports and the two breakout ends for QSFP56 ports. Check the Arista Transceiver and Cable Guide for supported platforms before deployment.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Breakout from a single 400G QSFP-DD port to two 200G QSFP56 ports
- Passive twinax copper construction with no optics required
- Hot swappable for simple serviceability and maximum uptime
- Complies with IEEE 802.3 Ethernet and MSA standards
- Cost-effective short-reach connectivity for high-density 400G deployments
- Carries CE, KCC, RCM and UKCA certifications with RoHS and WEEE compliance

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Datasheet

Technical Specifications

- PHY type: 400GBASE-CR8 to 2x 200GBASE-CR4
- Connector type: QSFP-DD to 2x QSFP56
- Cable type: Twinax copper (passive DAC)
- Length: 2.5 m
- Wavelength: N/A (copper)
- QSFP-DD form factor Type 1 (HxWxD): 13.5 x 18.4 x 78.3 mm
- QSFP-DD form factor Type 2 (HxWxD): 13.5 x 18.4 x 93.3 mm
- QSFP form factor (HxWxD): 13.5 x 18.4 x 72.4 mm
- Operating case temperature: 0 to 70 C
- Storage temperature: -40 to 70 C
- Relative humidity: 5 to 95%
- Operating altitude: 0 to 10,000 ft
- IEEE compliance: 802.3 Ethernet
- EMC: FCC Part 15 Subpart B Class A, ICES-003 Issue 7, EN 55032:2015, EN 55035:2017
- Safety: EN 62368-1:2014 + A11:2017, IEC 62368-1:2014
- Certifications: CE, KCC, RCM, UKCA
- Directives: 2014/35/EU LVD, 2014/30/EU EMC, 2012/19/EU WEEE, 2011/65/EU RoHS

FAQs

Q: What does this cable connect?
A: It links one 400G QSFP-DD port (400GBASE-CR8) to two 200G QSFP56 ports (200GBASE-CR4), splitting the 400G link into two 200G links.

Q: Does it need external power?
A: No. It is a passive copper cable with no separate power supply.

Q: How far can this cable reach?
A: This cable is 2.5 m long, intended for in-rack and adjacent-rack connections.

Q: Which ports is it designed for?
A: The host end suits 400G QSFP-DD ports using 8x50G PAM4 lanes, and the two breakout ends suit QSFP56 ports. Refer to Arista's Transceiver and Cable Guide for supported platforms.

Q: Can it be connected or removed while the equipment is running?
A: Yes. The cable is hot swappable.

Datasheet

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