Vitex D8C-P2Q002C-HA 800G OSFP to 2x 400G QSFP112 breakout DAC 2m

800G OSFP Finned-top to 2x 400G QSFP112 Breakout Direct Attach Copper Cable, 2m, MSA Compliant

Name: 800G OSFP Finned-top to 2x 400G QSFP112 Breakout Direct Attach Copper Cable, 2m, MSA Compliant
Brand: Vitex LLC
SKU: D8C-P2Q002C-HA
Price: 250.00 USD
Availability: InStock

Vitex Part #: D8C-P2Q002C-HA

The D8C-P2Q002C-HA is a 2m 800G OSFP to 2x 400G QSFP112 passive breakout Direct Attach Copper cable. It lets one 800G OSFP switch port serve two 400G NICs in the same rack via an integrated copper assembly. The OSFP end is an IHS finned-top connector with 8x 106.25 Gb/s PAM4 electrical signaling; each QSFP112 branch carries 4 lanes for independent 400G operation.

This is the lowest-cost, lowest-power, lowest-latency way to double switch-to-NIC density on 800G platforms for in-rack server links. Reference application: NVIDIA Spectrum-4 (SN5610) into 2x ConnectX-7 NICs or BlueField-3 DPUs at 400G.

Features
Specifications
Applications
FAQs
Datasheet

1x 800G OSFP IHS finned-top to 2x 400G QSFP112 passive breakout
2m fixed copper cable assembly
8x 106.25 Gb/s PAM4 electrical lanes (4 per QSFP112 branch)
Zero power consumption (fully passive)
Doubles switch-to-NIC density on 800G OSFP platforms
Built-in CMIS EEPROM on all three ends for cable identification
Validated on NVIDIA Spectrum-4 (SN5600, SN5610)
Compliant with OSFP MSA, QSFP112 MSA, IEEE 802.3ck
Twin-axial copper with individually shielded pairs
Commercial temperature 0 to 70 degC
RoHS 2 and REACH compliant
US-based engineering support from New Jersey HQ

Category	Direct Attach Cable (DAC) - Passive Breakout
Form Factor	1x OSFP IHS Finned-top to 2x QSFP112
Data Rate	800 Gb/s aggregate / 2x 400 Gb/s per branch
Cable Length	2m
Configuration	Breakout (1:2)
Protocol	Ethernet, InfiniBand
Power	Passive (zero)
Cable Type	Twin-axial copper, shielded pairs
Cable Jacket	LSZH
Management	CMIS EEPROM on all three ends
Temperature	Commercial (0 to 70 degC)
Compliance	OSFP MSA, QSFP112 MSA, IEEE 802.3ck, RoHS 2

NVIDIA SN5600 / SN5610 to 2x ConnectX-7 (400G mode) Breakout Top-of-Rack 800G Port to 2x BlueField-3 DPU In-Rack Server NIC Density Doubling Cost-Optimized AI Cluster Server Connections Hyperscaler 800G Leaf-to-2x400G Server Topologies

Q: When does an 800G to 2x 400G breakout DAC make sense?
A: When you have 800G switch ports but 400G NICs and want to maximise switch port utilization in-rack. One 800G switch port serves two 400G servers, doubling effective port density and roughly halving switch and cabling cost-per-NIC for short runs.

Q: Which NVIDIA platforms support this breakout?
A: 800G OSFP side validated on NVIDIA Spectrum-4 (SN5600, SN5610) and Spectrum-X800 (SN6000). QSFP112 branches go to ConnectX-7 or BlueField-3 configured for 400G-VR4 mode.

Q: Can each QSFP112 branch run independently?
A: Yes. Each branch is an independent 400G port. You can connect one or both. The OSFP port will report breakout mode via DDM, and the switch sees two 400G interfaces (or one 400G LAG depending on switch configuration).

Q: What is the maximum reach for a passive 1-to-2 breakout DAC at 800G?
A: 2m is the practical maximum for 800G OSFP to 2x 400G QSFP112 passive copper. The 4 lanes per QSFP112 branch operate at 106.25 Gbaud PAM4 which limits passive reach. For longer in-rack runs, use the corresponding AOC breakout variant.

Q: Do I need to configure breakout mode in the switch CLI?
A: Yes. Most switches require explicit configuration of the 800G port into 2x 400G breakout mode (e.g. via "speed 400000 lanes 1-4" / "lanes 5-8" or vendor-specific commands). Refer to your switch documentation. The DAC EEPROM signals that it is a breakout cable.

Q: How does total cost compare to two separate 400G DACs?
A: A breakout DAC is roughly 30-40% cheaper than two equivalent 400G DACs, plus it consumes only one 800G switch port instead of two 400G ports. Significant savings at scale.

Q: Is the cable rated for plenum installations?
A: Standard LSZH jacketing meets low-smoke / zero-halogen requirements. CMP plenum-rated variants available on request. Confirm building code requirements before install.

Technical Documentation

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Download Datasheet PDF

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