• Arista 400G QSFP-DD to QSFP-DD passive twinax DAC cable, 2.5m
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Arista

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

CAB-D-D-400G-2.5

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Description

This 400G QSFP-DD to QSFP-DD passive twinax direct attach cable provides a 2.5 m copper link using 400GBASE-CR8 signalling to IEEE 802.3cd. It carries 400G Ethernet over 8 lanes of 50G PAM4 with QSFP-DD connectors at both ends. It suits short-reach switch-to-switch and switch-to-server connections within a rack or between adjacent racks in data centre environments.

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

Features

- Passive twinax copper construction with no active electronics in the cable
- QSFP-DD connectors at both ends
- 400GBASE-CR8 operation using 8 lanes of 50G PAM4
- IEEE 802.3cd compliant
- Suited to short in-rack and adjacent-rack 400G links

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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specs-tabs

Technical Specifications

FAQs

Technical Specifications

- Connector type: QSFP-DD to QSFP-DD
- Data rate: 400G Ethernet
- Standard: 400GBASE-CR8, IEEE 802.3cd
- Cable type: Passive twinax copper DAC
- Lane configuration: 8 x 50G PAM4
- Reach: 2.5 m

FAQs

Q: What standard does this cable support?
A: It supports 400GBASE-CR8 as defined in IEEE 802.3cd, using 8 lanes of 50G PAM4 signalling.

Q: What connectors does this cable use?
A: It has QSFP-DD connectors at both ends, so it connects QSFP-DD ports on each side.

Q: Is this an active or passive cable?
A: It is a passive twinax copper direct attach cable, so it contains no active signal conditioning electronics.

Q: What is the cable length?
A: This SKU has a reach of 2.5 m. Other lengths are listed under separate SKUs.

Q: Where is this cable typically used?
A: It suits short-reach 400G connections such as top-of-rack switch to server or switch to switch links within the same or neighbouring racks.

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