What connector configurations distinguish QDD-QDD-C from O400-QDD-C in the 400G OSFP & QSFP-DD DAC category?

QDD-QDD-C has 400G QSFP-DD connectors at both ends, while O400-QDD-C combines one 400G OSFP Flat Top connector with one 400G QSFP-DD connector. The first supports same-form-factor links; the second supports mixed-form-factor links.

Which model in the 400G OSFP & QSFP-DD DAC category supports the longer maximum cable length?

QDD-QDD-C. It is available from 0.5m to 3m, while O400-QDD-C is offered from 0.5m to 2.5m. The required connector combination should therefore be considered together with the link length.

Can QDD-QDD-C provide a direct 400G connection between two devices equipped with QSFP-DD ports?

Yes. QDD-QDD-C is a straight-through passive copper twinax cable with a 400G QSFP-DD connector at each end. It supports direct QSFP-DD-to-QSFP-DD links over available lengths from 0.5m to 3m.

Can O400-QDD-C directly connect a 400G OSFP Flat Top port to a 400G QSFP-DD port?

Yes. O400-QDD-C provides one OSFP Flat Top end and one QSFP-DD end in a single passive copper assembly. It is designed for direct 400G links between equipment using these two different port form factors and is available from 0.5m to 2.5m.

Do QDD-QDD-C and O400-QDD-C operate as breakout cables for multiple lower-speed ports?

No. Both models are one-to-one 400G cables with one connector at each end. QDD-QDD-C links two QSFP-DD ports, while O400-QDD-C links one OSFP Flat Top port to one QSFP-DD port; neither model includes multiple branch connectors.

Do QDD-QDD-C and O400-QDD-C require separate optical transceivers or fiber patch cables?

No. Both are integrated passive direct attach copper twinax assemblies that plug directly into the corresponding host ports. They carry the 400G connection over copper and do not use separate optical modules or fiber patch cables.

Can AICPLIGHT help confirm the correct model and length before ordering a 400G OSFP & QSFP-DD DAC cable?

Yes. Provide the connector type at each endpoint and the required cable length. AICPLIGHT can then help determine whether QDD-QDD-C or O400-QDD-C matches the connection and confirm availability within the specified length range.

400G OSFP & QSFP-DD DAC

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400G QSFP-DD to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable

QDD-QDD-C

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US$71.00
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400G OSFP Flat Top to 400G QSFP-DD Passive Direct Attach Copper Twinax Cable

O400-QDD-C

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US$134.00
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400G OSFP & QSFP-DD DAC Overview

The 400G OSFP & QSFP-DD DAC category contains two passive direct attach copper twinax cables for 400G equipment connections. The series includes a QSFP-DD-to-QSFP-DD straight cable and an OSFP Flat Top-to-QSFP-DD cable, covering links between matching or mixed-form-factor ports. Both designs use ultra-low-loss materials, eight twisted-pair conductors, a square-ring structure, and an extended connector housing for mechanical flexibility and cable bending. Available in lengths from 0.5m to 3m, these cables are designed for short-distance connections in switching systems used for SDN, machine learning, and cloud computing.

QDD-QDD-C is a passive copper twinax cable with 400G QSFP-DD connectors at both ends, providing a straight 400G connection between two QSFP-DD ports. Its construction incorporates ultra-low-loss materials, eight twisted-pair conductors, a square-ring structure, and an extended housing design. Available in lengths from 0.5m to 3m, the cable has been tested in switching systems for end-to-end links in SDN, machine learning, and cloud computing environments.

O400-QDD-C connects one 400G OSFP Flat Top port to one 400G QSFP-DD port through a passive copper twinax assembly. The mixed-form-factor design supports direct 400G links between OSFP-based equipment and QSFP-DD switching or network ports. It uses ultra-low-loss materials, eight twisted-pair conductors, a square-ring structure, and an extended housing construction. Offered in lengths from 0.5m to 2.5m, it is intended for short-distance interconnections in SDN, machine learning, and cloud computing systems.

What connector configurations distinguish QDD-QDD-C from O400-QDD-C in the 400G OSFP & QSFP-DD DAC category?: QDD-QDD-C has 400G QSFP-DD connectors at both ends, while O400-QDD-C combines one 400G OSFP Flat Top connector with one 400G QSFP-DD connector. The first supports same-form-factor links; the second supports mixed-form-factor links.
Which model in the 400G OSFP & QSFP-DD DAC category supports the longer maximum cable length?: QDD-QDD-C. It is available from 0.5m to 3m, while O400-QDD-C is offered from 0.5m to 2.5m. The required connector combination should therefore be considered together with the link length.
Can QDD-QDD-C provide a direct 400G connection between two devices equipped with QSFP-DD ports?: Yes. QDD-QDD-C is a straight-through passive copper twinax cable with a 400G QSFP-DD connector at each end. It supports direct QSFP-DD-to-QSFP-DD links over available lengths from 0.5m to 3m.
Can O400-QDD-C directly connect a 400G OSFP Flat Top port to a 400G QSFP-DD port?: Yes. O400-QDD-C provides one OSFP Flat Top end and one QSFP-DD end in a single passive copper assembly. It is designed for direct 400G links between equipment using these two different port form factors and is available from 0.5m to 2.5m.
Do QDD-QDD-C and O400-QDD-C operate as breakout cables for multiple lower-speed ports?: No. Both models are one-to-one 400G cables with one connector at each end. QDD-QDD-C links two QSFP-DD ports, while O400-QDD-C links one OSFP Flat Top port to one QSFP-DD port; neither model includes multiple branch connectors.
Do QDD-QDD-C and O400-QDD-C require separate optical transceivers or fiber patch cables?: No. Both are integrated passive direct attach copper twinax assemblies that plug directly into the corresponding host ports. They carry the 400G connection over copper and do not use separate optical modules or fiber patch cables.
Can AICPLIGHT help confirm the correct model and length before ordering a 400G OSFP & QSFP-DD DAC cable?: Yes. Provide the connector type at each endpoint and the required cable length. AICPLIGHT can then help determine whether QDD-QDD-C or O400-QDD-C matches the connection and confirm availability within the specified length range.