VSFF Fiber Connectivity for 400G / 800G / 1.6T

MMC Connectors and Cable Assemblies for 400G / 800G Data Centers

High-density multi-fiber miniature connectors, jumpers, trunk cables and breakout harnesses manufactured for hyperscale, cloud and AI infrastructure.

VSFF Form Factor 12F / 16F / 24F 400G / 800G / 1.6T Factory-Terminated & Tested
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Category Products

MMC Solutions Product Range

VSFF Technology

What Is MMC?

MMC (Multi-fiber Miniature Connector) is a very-small-form-factor multi-fiber connector designed for data centers that need more fiber ports in the same rack space.

MMC very-small-form-factor multi-fiber connector

MMC Connector Definition

Unlike legacy MPO, which uses a standard-size body, MMC reduces the connector and adapter footprint so more lanes fit into a 1RU or 2RU panel when the panel is designed for VSFF.

Multi-fiber VSFF12F, 16F and 24F configurations for compact parallel-optics connectivity.
New high-density buildsSuited to VSFF-compatible transceivers, panels and greenfield cabling plants.
Factory terminatedCustom lengths, polarity, labeling and channel-level IL/RL reports available.
Density & Performance

Why Data Center Buyers Are Looking at MMC

01

Higher Panel Density

A smaller connector body supports more adapter positions when the panel is engineered for VSFF.

02

Parallel-Optics Ready

12F, 16F and 24F options map to 400G, 800G and future 1.6T link planning.

03

Lower Cable Congestion

Compact interfaces and reduced cable bulk improve routing, access and airflow in dense racks.

04

Factory-Terminated Options

Pre-terminated jumpers, trunks and harnesses reduce field work and test-failure risk.

05

Migration Flexibility

MMC-to-MPO harnesses can introduce MMC on new links while preserving existing MPO infrastructure.

Engineering note: Density advantage is panel-dependent. Final density must be evaluated against the exact VSFF and MPO panel designs used in the project.

Connector Selection

MMC vs MPO vs SN vs MDC

Compare the connector ecosystem, fiber count and application fit before committing to a high-density cabling architecture.

DimensionMMCMPO / MPO-16SNMDC
Form factorVSFF multi-fiberStandard multi-fiberVSFF duplexVSFF duplex
Fiber count12F / 16F / 24F8F / 12F / 16F / 24F / 32F / 48F2F2F
Best forNew high-density parallel-optics buildsExisting infrastructure and broad compatibility400G/800G duplex breakout400G/800G duplex breakout
Intermateable with MPONoN/ANoNo
EcosystemEmergingMatureGrowingGrowing
Configuration Guide

Technical Specifications

Define fiber count, fiber type, gender, polarity, polish and jacket rating around the transceiver and facility requirements.

Fiber Counts & Lane Mapping

  • 12F / 16F / 24F portfolio
  • 16F for 400G SR8/DR8 and 800G SR8 planning
  • 24F for higher-count spine-leaf links

Fiber Types

  • OS2 single-mode for long reach
  • OM3 and OM4 multimode
  • OM5 wideband multimode

Gender & Polarity

  • Male and female options
  • Type A, Type B and Type C
  • Custom channel mapping

Polish Types

  • UPC for common data center links
  • APC when low back reflection is critical

Jacket Ratings

  • LSZH indoor safety
  • OFNR riser-rated
  • OFNP plenum-rated

Factory Testing

  • Insertion loss per channel
  • Return loss verification
  • Reports per cable or project
Product Portfolio

Complete MMC Connectivity Range

Choose the assembly family that matches the equipment interface, backbone design and migration plan.

MMC jumper patch cord

MMC-MMC Jumper / Patch Cord

Short-reach 12F, 16F and 24F interconnection for panels, switches and test equipment.

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Deployment Scenarios

Typical MMC Applications

AI

AI Training Clusters

High lane density between GPU servers and leaf switches.

DC

Hyperscale Cloud

More port capacity per rack unit with lower cable bulk.

SL

Spine-Leaf Fabrics

High-fiber-count trunks between spine and leaf layers.

1U

High-Density Patching

Compact patching fields for colocation and enterprise data centers.

BOM Planning

How to Specify an MMC Cable Assembly

  1. 01

    Match the transceiver and fiber count

    Identify the exact 400G or 800G transceiver model to define lane count and polarity.

  2. 02

    Choose fiber type and reach

    Select OS2 or OM3/OM4/OM5 based on the distance and data rate.

  3. 03

    Set gender and polarity

    Specify male/female interfaces and Type A, B, C or custom polarity.

  4. 04

    Define jacket, length and labeling

    Choose LSZH, OFNR or OFNP, then confirm lengths and field labels.

  5. 05

    Request test reports

    Add IL/RL acceptance data to simplify commissioning and project documentation.

Factory-Backed Supply

Why Source MMC From BWNFiber

Engineering review and controlled manufacturing help align each assembly with the transceiver, rack plan and installation workflow.

Request a BOM Review
  • Direct manufacturerConnector, adapter, jumper, trunk and harness supply without trading layers.
  • Application engineeringReview of transceiver lists, rack layouts and polarity plans.
  • Flexible configurationsOS2, OM3, OM4, OM5; gender, polarity, jacket and labeling options.
  • Factory test reportsIL/RL data available per cable or by project.
  • Custom cable buildsLength, fan-out, color code, packaging and BOM-specific production.
  • Data center focusSupport for hyperscale, cloud and AI cluster connectivity.
FAQ

Frequently Asked Questions

Technical answers for early-stage MMC architecture and BOM planning.

What does MMC stand for?

MMC stands for Multi-fiber Miniature Connector, a VSFF multi-fiber connector for high-density data centers.

Is MMC the same as MPO?

No. MPO has a broad installed base and a standard-size body. MMC is a smaller VSFF format, and the two do not intermate directly.

What fiber count do I need for 400G or 800G?

400G SR8/DR8 and 800G SR8 commonly use 16 fibers. Confirm the exact lane map in the transceiver datasheet before specifying the cable.

Can MMC work with existing MPO infrastructure?

Not directly. Migration options include adapter panels, MMC-to-MPO harnesses, or introducing MMC only on new links.

What is the difference between MMC, SN and MDC?

MMC is a multi-fiber VSFF format. SN and MDC are duplex VSFF formats with two fibers per connector.

Which fiber type should I choose?

Use OS2 for long-reach single-mode links or OM3, OM4 and OM5 for multimode links based on reach and transceiver requirements.

Can I get custom length, labeling and test reports?

Yes. BWNFiber supports custom lengths, jacket ratings, labeling, packaging and insertion-loss/return-loss reports.

What is the lead time for MMC assemblies?

Lead time depends on fiber count, length, quantity and customization. Send the BOM for a project-specific schedule.

Application Engineering

Need help specifying MMC for your project?

Send your transceiver list, rack elevations and fiber plan. Our team will review polarity, fiber count and cable lengths, then recommend the right MMC configuration.

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