800G OSFP Finned-top to 2x 400G QSFP112 Breakout Active Optical Cable, 30m, MSA Compliant
The V8C-P2Q030C-HA is a 30m 800G OSFP to 2x 400G QSFP112 breakout Active Optical Cable. It enables a single 800G OSFP switch port to serve two 400G QSFP112 endpoints (ConnectX-7 or BlueField-3 in 400G mode) over one integrated optical assembly. The OSFP end uses an IHS finned-top module with 8x 106.25 Gb/s PAM4 lanes; each QSFP112 branch operates as an independent 400G-VR4 port carrying 4 lanes.
This breakout topology doubles effective switch-to-NIC density on 800G platforms, cutting cost-per-NIC and rack-space cabling complexity in AI training fabrics. Reference application: NVIDIA Spectrum-4 (SN5600) spine into 2x ConnectX-7 NICs at 400G.
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- Features
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- Datasheet
- 1x 800G OSFP IHS finned-top to 2x 400G QSFP112 breakout
- 30m factory-terminated active optical assembly
- 8x 106.25 Gb/s PAM4 lanes (4 lanes per QSFP112 branch)
- Each QSFP112 branch operates as an independent 400G-VR4 port
- Internal VCSEL / 850 nm OM4-class multi-mode fiber
- Doubles switch-to-NIC density on 800G OSFP platforms
- Plug-and-play - no field cleaning or polarity setup required
- Validated on NVIDIA Spectrum-4, Spectrum-X800 (OSFP side); ConnectX-7 in 400G mode (QSFP112 side)
- Compliant with OSFP MSA, QSFP112 MSA, IEEE 802.3ck
- Built-in EEPROM with DDM on all three ends
- Commercial temperature 0 to 70 degC; max power 15 W
- RoHS 2 and REACH compliant
- US-based engineering support from New Jersey HQ
| Category | Active Optical Cable (AOC) |
|---|---|
| Form Factor | 1x OSFP IHS Finned-top to 2x QSFP112 |
| Data Rate | 800 Gb/s aggregate / 2x 400 Gb/s per branch |
| Wavelength | 850 nm (internal MMF) |
| Cable Length | 30m overall trunk |
| Configuration | Breakout (1:2) |
| Protocol | Ethernet, InfiniBand |
| Cable Jacket | LSZH |
| Management | EEPROM, DDM on all ends |
| Power Supply | 3.3 V single supply |
| Temperature | Commercial (0 to 70 degC) |
| Compliance | OSFP MSA, QSFP112 MSA, IEEE 802.3ck, RoHS 2 |
Q: What is a 1-to-2 breakout AOC and when do I need one?
A: A breakout AOC has one high-speed connector on one end (here, 800G OSFP) and two lower-speed connectors on the other end (here, 2x 400G QSFP112). It lets one 800G switch port serve two 400G NICs, doubling port density and lowering cost-per-NIC. Common in AI training fabrics where switch ports are scarce.
Q: Which NVIDIA platforms is this validated on?
A: The 800G OSFP end is validated on NVIDIA Spectrum-4 (SN5600), Spectrum-X800 (SN6000), Quantum-2, and Quantum-X800 switches. The QSFP112 branches terminate into NVIDIA ConnectX-7 NICs configured for 400G-VR4 mode.
Q: Can I use only one of the two QSFP112 branches?
A: Yes. Each branch operates as an independent 400G port. If only one branch is connected, the other simply stays inactive. The OSFP port will report 800G LAG / 2x400G mode through DDM.
Q: Why use a breakout AOC vs two separate 400G AOCs?
A: One 800G switch port serves two 400G NICs, saving switch port cost and rack-space cabling. For AI training fabric at scale, this can cut switch and cabling cost by 30-50% vs full 400G-per-NIC connectivity.
Q: Are the QSFP112 branches addressable as separate Linux interfaces?
A: Yes. The breakout is handled at the switch ASIC SerDes level. From the NIC perspective, each ConnectX-7 sees a normal 400G-VR4 link. From the switch, the 800G port appears as two 400G LAG members or two independent 400G interfaces depending on configuration.
Q: Is the cable user-serviceable?
A: No. The assembly is factory-terminated and sealed at all three connector housings. Damaged cables must be replaced.
Q: What other lengths are available?
A: 30m is the standard online length. Custom lengths from 3m to 50m are available; contact Vitex engineering for a quote on custom variants.
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