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LGX cassette turning an MPO trunk into duplex LC ports.
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.
| Fiber Count | 12F |
|---|---|
| Connector A | 1 × MTP® / MPO 12-fibre rear adapter |
| Connector B | 6 × LC duplex front adapters |
| Ports | 12 fibres / 6 duplex |
| Fiber Type | OS2 single-mode, G.652.D — Corning SMF-28 Ultra |
| Insertion Loss | ≤ 0.35 dB |
| Return Loss | ≥ 60 dB |
| Connector Polish | APC — 8° angled, green housing |
| Polarity | Type B internal mapping |
| Wavelength | 1310 / 1550 nm |
| Typical Insertion Loss | 0.25 dB |
| Loss Grade | Standard |
| Format | LGX-compatible cassette, 1×LGX footprint |
|---|---|
| Rear Gender | Female (unpinned) MPO adapter |
| Front Adapter | LC duplex, ceramic split sleeve, shuttered |
| Housing | Cold-rolled steel, black powder coat |
| Labelling | Front port numbering plus writable label strip |
| Operating Temp | -10 °C to +60 °C |
| Compliance | IEC 61754-7 / -20, TIA-604-5, RoHS |
| Jacket Colour | Yellow |
| Optical Test | 100% — every fibre measured for insertion loss and return loss before shipment |
|---|---|
| Ferrule Geometry | Interferometer-verified: radius of curvature, apex offset and fibre height to IEC 61755-3 |
| End-Face Inspection | Every ferrule inspected and graded to IEC 61300-3-35 |
| Test Report | Per-fibre measured data supplied with the assembly, traceable to the serial number |
| Connector Source | US Conec MTP® ferrules; genuine-brand or FOT MPO to your preference |
| Customisation | Fibre count, type, polish, polarity, gender, jacket, leg length and overall length built to order |
| Lead Time | Stock configurations 3–5 days; custom builds 7–10 days |
| Warranty | 3 years |
| Part Number | Configuration | Fibre count | Availability |
|---|---|---|---|
| FOT-MPO-CAS | Standard configuration | 12F | Build to order |
| FOT-MPO-CAS-8F | Fibre count: 8F → 4 × LC duplex | 8F | Build to order |
| FOT-MPO-CAS-16F | Fibre count: 16F → 8 × LC duplex | 16F | Build to order |
| FOT-MPO-CAS-24F | Fibre count: 24F → 12 × LC duplex | 24F | Build to order |
| FOT-MPO-CAS-LCS | Front connector: LC duplex, shuttered | 12F | Build to order |
| FOT-MPO-CAS-SC | Front connector: SC duplex | 12F | Build to order |
| FOT-MPO-CAS-VSFF | Front connector: MDC / SN (VSFF) | 12F | Build 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.
Insertion loss and return loss recorded for every fibre, not sampled.
Interferometer data on ferrule radius, apex offset and fibre height.
Every end face checked against IEC 61300-3-35 before packing.
Dust-capped, coiled on a reel or in a bag with the test report and pulling sock.
Parallel 40G/100G/400G/800G backbone between spine, leaf and top-of-rack panels.
Rail-optimised accelerator fabrics where one switch port breaks out to several GPUs.
Pre-terminated backbone that installs in hours instead of days, with the loss budget known up front.
Loopbacks, attenuators and inspection for proving ports before the link goes live.
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.
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.
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'.
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.
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.
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.