MPO-12 to 2x MPO-12 8-Fiber Female APC OM4 Type B Fiber Breakout Cable, 10m
The M12F2M12FOM4-B2-10 is a 10m MPO-12 to 2x MPO-12 OM4 multimode fiber breakout cable for splitting a single 800G-VR8 or 800G-SR8 transceiver port into two independent 400G-VR4 links. The single MPO-12 end aggregates 8 fibers; each of the two MPO-12 branches carries 4 fibers for one 400G-VR4 connection. Female-female APC connectors throughout, Type B polarity, 3.0mm LSZH jacket.
10m is the most common in-row breakout length for AI fabric where one 800G OSFP switch port serves two 400G NICs in adjacent racks. Compatible with all Vitex 800G OSFP IHS VR8/SR8 transceivers on the spine side and 400G QSFP112 / OSFP-RHS VR4 transceivers on the NIC side.
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- Features
- Specifications
- Applications
- FAQs
- Datasheet
- 1x MPO-12 to 2x MPO-12 (female-female APC) breakout
- 8-fiber polarity Type B configuration (4 fibers per branch)
- Bend-insensitive OM4 multimode fiber
- 3.0mm LSZH outer jacket on trunk; reinforced breakout boot
- 10m overall trunk length
- Designed for 800G-VR8 / 800G-SR8 to 2x 400G-VR4 breakout topologies
- Insertion loss: <0.35 dB per connector typical; <0.5 dB at breakout point
- Return loss: >60 dB APC
- 100% factory-tested per IEC 61300-3-4
- Compliant with TIA-568.3-D, IEC 61753
- RoHS 2 and REACH compliant
- US-based engineering support from New Jersey HQ
| Category | Fiber Breakout Cable |
|---|---|
| Form Factor | 1x MPO-12 to 2x MPO-12 |
| Fiber Count | 8-fiber active (4 per branch) |
| Fiber Type | OM4 multimode (bend-insensitive) |
| Operating Wavelength | 850 nm / 1300 nm |
| Connector | MPO-12 APC Female (all three ends) |
| Polarity | Type B (reversed) |
| Insertion Loss | <0.35 dB typical per connector |
| Return Loss | >60 dB APC |
| Jacket | 3.0mm LSZH |
| Cable Length | 10m trunk |
| Temperature | Commercial (0 to 70 degC operating) |
| Compliance | TIA-568.3-D, IEC 61753, RoHS 2 |
Q: What is this breakout cable used for?
A: It splits one 800G-VR8 / 800G-SR8 transceiver port into two independent 400G-VR4 connections. One end plugs into the spine-side 800G transceiver (e.g. Vitex VO-8CVR8CM-AA); the two branches plug into two separate 400G transceivers (e.g. Vitex VQ-4CVR4CP-AA on ConnectX-7 NICs).
Q: Why use a breakout fiber vs a breakout AOC?
A: Breakout fiber gives modular flexibility - you can replace individual transceivers, swap to longer-reach optics later, or move the fiber to a different transceiver pairing. Breakout AOCs are sealed assemblies with all four transceivers built in - simpler install but no modular replacement.
Q: Why are connectors female (unpinned)?
A: All Vitex parallel-optic transceivers have male (pinned) MPO ports. Cable assemblies must be female (unpinned) on every end to mate correctly. Pin-on-pin or unpinned-to-unpinned will not align ferrules properly.
Q: Is the polarity correct for 800G-VR8 to 2x 400G-VR4 breakout?
A: Yes. Type B polarity provides the correct lane swap for parallel optics breakout. Each branch maps the right 4 fibers from the trunk to align with the 4 active fibers in a 400G-VR4 port.
Q: What is the max reach over this cable?
A: 50m on OM4 / 30m on OM3 for VR4 / VR8 optics. SR4 / SR8 support up to 100m on OM4. This 10m variant is well inside all parallel multimode budgets.
Q: Are other lengths available?
A: Yes. Standard online lengths are 10m, 30m, 50m. Custom lengths from 3m to 100m available on request. Contact Vitex engineering for quotes.
Q: How is this different from a structured cabling MPO trunk?
A: A breakout cable is a single pre-terminated assembly with no patch panels - simpler install, lower loss, no patch field reconfiguration. Structured trunks use patch panels for flexibility but add 2-3 connector pairs to the loss budget. Choose breakout for fixed topology; choose structured for reconfigurable patch fields.
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