400G DR4 QSFP112 SMF 1310nm 500m MPO-12 Ethernet/InfiniBand Transceiver, MSA Compliant
The VQ-4CDR4CP-AA is a 400G QSFP112 DR4 optical transceiver for medium-reach AI data center connections. It supports 4x 100 Gb/s PAM4 parallel lanes over single-mode fiber and delivers 400 Gb/s aggregate throughput up to 500m via an MPO-12 APC connector. The QSFP112 form factor offers the smallest power and thermal footprint at 400G.
Primary use case: NIC-side endpoint of 800G-DR8 to 2x 400G-DR4 breakout topologies from OSFP-based NVIDIA spine switches into ConnectX-7 NICs in 400G mode. Compliant with QSFP112 MSA and IEEE 802.3ck.
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MSA Compliant
Standards-based, multi-vendor
1.6T & 800G Ready
Next-gen AI fabric optics
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- Features
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- FAQs
- Datasheet
- 400 Gb/s aggregate data rate (4x 100 Gb/s PAM4)
- QSFP112 form factor
- Up to 500m reach over SMF with RS(544,514) FEC
- MPO-12 APC optical interface (8-fiber active)
- EML transmitter and PIN photodiode receiver
- Designed as NIC-side endpoint of 800G-DR8 to 2x 400G-DR4 breakouts
- Compliant with QSFP112 MSA, IEEE 802.3ck, CMIS 5.0
- Full DDM telemetry
- Single 3.3 V supply; Maximum power 10 W
- Commercial temperature 0 to 70 degC
- RoHS 2 and REACH compliant
- US-based engineering support from New Jersey HQ
| Category | Optical Transceiver |
|---|---|
| Form Factor | QSFP112 |
| Data Rate | 400 Gb/s (4x 100 Gb/s PAM4) |
| Wavelength | 1310 nm |
| Fiber Type | Single-Mode Fiber (SMF) |
| Distance | 500m |
| Connector | MPO-12 APC (female on cable side) |
| Protocol | Ethernet, InfiniBand |
| Optics | EML TX / PIN PD RX |
| FEC | RS(544,514) host-side |
| Management | CMIS 5.0, DDM |
| Power Supply | 3.3 V single supply |
| Max Power | 10 W max |
| Temperature | Commercial (0 to 70 degC) |
| Compliance | QSFP112 MSA, IEEE 802.3ck, CMIS 5.0, RoHS 2 |
Q: What is the 400G QSFP112 DR4 used for?
A: Most commonly as the NIC-side endpoint of an 800G-DR8 to 2x 400G-DR4 breakout from an OSFP-based switch into ConnectX-7 NICs in 400G mode. It also works for direct 400G-to-400G server-to-server or switch-to-switch links over SMF up to 500m.
Q: When should I choose DR4 vs FR4?
A: DR4 uses 4 parallel single-mode fibers (MPO-12) for 500m reach at lower per-port cost. FR4 uses CWDM over a single duplex LC fiber pair for 2km reach with simpler fiber management. DR4 is more common in compact AI clusters; FR4 is used for inter-hall connections.
Q: Is this validated on NVIDIA switches directly?
A: NVIDIA Spectrum and Quantum 400G+ switches use the OSFP form factor. QSFP112 is the NIC-side option for ConnectX-7 in 400G mode. For switch-side 400G on NVIDIA, use the Vitex 400G OSFP-RHS DR4 instead.
Q: What fiber and patch cable do I need?
A: Standard single-mode fiber with MPO-12 APC connectors. Transceiver ports are male (pinned), so patch cables must be female (unpinned). For 800G-DR8 to 2x 400G-DR4 breakouts, use a SMF MPO-12 to 2x MPO-12 breakout assembly.
Q: What is the typical use case in an AI cluster?
A: Spine switch (Vitex 800G DR8 OSFP) breaks out to two server NICs (Vitex 400G DR4 QSFP112) over a single MPO-12 to 2x MPO-12 SMF breakout cable. Common in GPU pods where the leaf switch sits 50-500m from the GPU racks.
Q: What is the link power budget at 500m?
A: 400G-DR4 per-lane budget is ~4.0 dB. A 500m run consumes ~0.2 dB of fiber attenuation plus ~0.7 dB across two MPO-12 APC connectors. Total ~0.9 dB - very comfortable budget. Always clean endfaces before mating.
Q: Why source 400G optics from Vitex?
A: Contact Vitex engineering for details on this configuration.
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