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

Arista CAB-D-2Q-400G-3M | 400G QSFP-DD to 2x 200G QSFP56 DAC Breakout Cable, 3m

CAB-D-2Q-400G-3M

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Description

This passive twinax copper DAC breakout cable splits one 400G QSFP-DD port into two 200G QSFP56 links, making it suited to connecting 400G switch ports to 200G QSFP56 NICs or GPUs over short distances. The 3m length covers in-rack and adjacent-rack runs, and the passive design needs no external power. It uses 400GBASE-CR8 on the QSFP-DD end and 200GBASE-CR4 on each QSFP56 breakout leg.

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

Features

- Breaks out a 400G QSFP-DD port into 2 x 200G QSFP56 ports
- Connects to third-party 200G QSFP ports such as NICs and GPUs
- Passive design with no external power required
- Passive copper DAC maximum supported length is 3m

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

Technical Specifications

- 400GBASE-CR8 QSFP-DD to 2 x 200GBASE-CR4 QSFP breakout
- Passive twinax copper (DAC)
- Length: 3m
- 2 x 200G-4 links using 50G PAM-4 modulation
- Same cable family also supports 2 x 100G-4 (25G NRZ) breakout to 100G QSFP ports

FAQs

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

Q: Is this an active or passive cable?
A: It is a passive twinax copper DAC and does not require external power.

Q: Can it connect to third-party NICs or GPUs?
A: Yes. It can connect to third-party 200G QSFP ports such as NICs and GPUs.

Q: What modulation does each 200G link use?
A: Each 200G-4 link uses 50G PAM-4 modulation.

Q: Is 3m the longest passive DAC option for this breakout?
A: Yes. The maximum supported length for passive copper DAC in this cable family is 3m, with 1m, 2m and 3m lengths available for QSFP-DD.

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