Optical Communication Products · Shenzhen, China
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MPO to LC Cassette Module

SKU: FOT-MPO-CAS · Cassettes, Modules & Panels

LGX cassette turning an MPO trunk into duplex LC ports.

12FFibre count
6 × LC duplexFront ports
≤ 0.35 dBInsertion loss
LGXStandard format
Fibre count
12F → 6 × LC duplex8F → 4 × LC duplex16F → 8 × LC duplex24F → 12 × LC duplex
Front connector
LC duplexLC duplex, shutteredSC duplexMDC / SN (VSFF)
Fibre type
OS2 single-mode (G.652.D)G.657.A1 bend-insensitiveG.657.A2 bend-insensitiveOM3 multimodeOM4 multimodeOM5 wideband
Loss grade
Standard lossLow lossExtra low loss
Polish
APC (angled, 8°)UPC / PC (flat)
Polarity
Type BType AType AF (flipped)
Format
LGX cassette1U 4-slot chassis2U 8-slot chassisWall-mount enclosure
Configured part numberFOT-MPO-CAS
Ships worldwide
Built to your configuration
3-year warranty

Product Overview

The cassette is the tidy way to land a parallel trunk. MPO adapters at the rear, duplex LC at the front, the fibre routing sealed inside. You re-patch the front all day without ever touching the trunk connector — which is exactly what you want, because the trunk connector is the one you cannot easily re-terminate.

Assemblies are built on US Conec MTP® ferrules and terminated in a controlled environment, then measured fibre by fibre. Interferometry checks the three geometry parameters that decide whether a multi-fibre ferrule mates properly — radius of curvature, apex offset and fibre height — and every end face is inspected and graded to IEC 61300-3-35 before the dust cap goes on.

Fibre count, fibre type, polish, polarity, gender, jacket rating, leg length and overall length are all build options rather than catalogue limits. Use the selector above to configure the exact assembly and the specification table will follow your choices; the measured test report ships with the cable.

Technical SpecificationsUpdates with your selection

Optical
Fiber Count12F
Connector A1 × MTP® / MPO 12-fibre rear adapter
Connector B6 × LC duplex front adapters
Ports12 fibres / 6 duplex
Fiber TypeOS2 single-mode, G.652.D — Corning SMF-28 Ultra
Insertion Loss≤ 0.35 dB
Return Loss≥ 60 dB
Connector PolishAPC — 8° angled, green housing
PolarityType B internal mapping
Wavelength1310 / 1550 nm
Typical Insertion Loss0.25 dB
Loss GradeStandard
Mechanical & Environment
FormatLGX-compatible cassette, 1×LGX footprint
Rear GenderFemale (unpinned) MPO adapter
Front AdapterLC duplex, ceramic split sleeve, shuttered
HousingCold-rolled steel, black powder coat
LabellingFront port numbering plus writable label strip
Operating Temp-10 °C to +60 °C
ComplianceIEC 61754-7 / -20, TIA-604-5, RoHS
Jacket ColourYellow
Testing, Quality & Supply
Optical Test100% — every fibre measured for insertion loss and return loss before shipment
Ferrule GeometryInterferometer-verified: radius of curvature, apex offset and fibre height to IEC 61755-3
End-Face InspectionEvery ferrule inspected and graded to IEC 61300-3-35
Test ReportPer-fibre measured data supplied with the assembly, traceable to the serial number
Connector SourceUS Conec MTP® ferrules; genuine-brand or FOT MPO to your preference
CustomisationFibre count, type, polish, polarity, gender, jacket, leg length and overall length built to order
Lead TimeStock configurations 3–5 days; custom builds 7–10 days
Warranty3 years

Ordering Information

Part NumberConfigurationFibre countAvailability
FOT-MPO-CASStandard configuration12FBuild to order
FOT-MPO-CAS-8FFibre count: 8F → 4 × LC duplex8FBuild to order
FOT-MPO-CAS-16FFibre count: 16F → 8 × LC duplex16FBuild to order
FOT-MPO-CAS-24FFibre count: 24F → 12 × LC duplex24FBuild to order
FOT-MPO-CAS-LCSFront connector: LC duplex, shuttered12FBuild to order
FOT-MPO-CAS-SCFront connector: SC duplex12FBuild to order
FOT-MPO-CAS-VSFFFront connector: MDC / SN (VSFF)12FBuild to order

Part numbers are indicative. Send us the fibre count, type, polish, polarity, gender, jacket and length and we confirm the exact build code on the quotation.

Quality & What's in the Box

Measured Fibre by Fibre

Insertion loss and return loss recorded for every fibre, not sampled.

Geometry Verified

Interferometer data on ferrule radius, apex offset and fibre height.

Inspected & Graded

Every end face checked against IEC 61300-3-35 before packing.

Packaging

Dust-capped, coiled on a reel or in a bag with the test report and pulling sock.

Typical Applications

Data Centre Spine & Leaf

Parallel 40G/100G/400G/800G backbone between spine, leaf and top-of-rack panels.

AI / GPU Clusters

Rail-optimised accelerator fabrics where one switch port breaks out to several GPUs.

Structured Cabling

Pre-terminated backbone that installs in hours instead of days, with the loss budget known up front.

Test & Commissioning

Loopbacks, attenuators and inspection for proving ports before the link goes live.

Frequently Asked Questions

Will this fit my existing panel?

LGX is a widely followed footprint, but latch details and chassis depth vary between vendors. Send us the make and model of the panel on your RFQ and we confirm fit before shipping — or buy the chassis with the cassettes and remove the question.

What does the cassette cost me in loss?

One mated MPO pair at the back and one mated LC pair at the front, so budget roughly 0.6 dB for the pair of cassettes at each end of the trunk. A harness saves you that, at the cost of flexibility. On a short in-row link it never matters; on a long single-mode span, check the budget first.

Can I mix polarity types in one chassis?

Yes — polarity is a property of the individual cassette, not the chassis, so a chassis can hold Type A and Type B cassettes side by side. Label them clearly; a mixed chassis is the single most common cause of 'the link is dead and the light is on the wrong fibre'.

How is the assembly labelled?

Both ends carry a printed label with the part number, fibre count, fibre type, polarity type and the serial number, and breakout legs are individually numbered. Tell us your own labelling convention on the RFQ and we print to it — it costs nothing and it saves an afternoon at installation.

Can I get free samples before ordering volume?

Yes. We supply qualification samples so you can measure the loss and check the fit in your own panels before committing. Per-order test reports are standard, and sample reports can be provided in advance for tender documentation.

Related MPO / MTP Products

Request a quote for this part

Tell us the platform and the quantity. An engineer checks the part against your switch and software version before quoting — if it will not work, we say so.

Goes to our engineers and the quotation desk together. Replies come from sales@topnetsystem.com, usually within one working day.