MTP vs MPO: What's the Real Difference?
MPO is the standard multi-fiber connector type; MTP® is US Conec's brand of MPO connector. Every MTP® connector is an MPO connector and mates with any standard-compliant MPO. The differences are inside the connector: a removable housing, a floating ferrule, elliptical stainless-steel guide pins and a metal pin clamp. Optical loss depends mostly on the ferrule grade, not the name on the housing.
That is the short answer. The rest of this guide explains where the two names come from, what the engineered differences actually do, what stays exactly the same, how standard and low-loss ferrule grades fit in, and how to write a specification that gets you the connector you really need. If you are new to multi-fiber connectors, start with our beginner's guide to MTP/MPO cables.
The Short Answer: Connector Type vs Brand
Think of MPO as the category and MTP® as one product inside it.
- MPO ("multi-fiber push on") is the generic connector type. Its mating interface is defined in IEC 61754-7 (parts 7-1 and 7-2) internationally and in TIA-604-5 (FOCIS 5) in North America. Any manufacturer can build an MPO connector to these documents.
- MTP® is a registered trademark of US Conec Ltd. for its own MPO connector. US Conec describes it as a high-performance MPO connector that is in complete compliance with TIA-604-5 and IEC 61754-7-1/-7-2, and intermateable with generic MPO connectors that comply with those standards.
So "MTP vs MPO" is not a choice between two incompatible systems. An MTP® patch cord plugs into an MPO adapter, mates with an MPO trunk, and plugs into the same transceiver port. The comparison is about construction, serviceability and how the connector is specified and sourced.
Where the Names Come From
Both connectors are built on the MT (mechanical transfer) ferrule, the rectangular multi-fiber ferrule developed by NTT in Japan, in which fibers sit on a 0.25 mm pitch between two precision guide holes. NTT's push-on connector around that ferrule became the MPO, which was then standardized by IEC and TIA.
US Conec, based in Hickory, North Carolina, manufactures MT ferrules and developed the MTP® connector as its enhanced MPO design. Because the brand became so widely used, many people say "MTP" when they mean any MPO connector, much as a brand name can become a generic word. On a purchase order, though, the two terms mean different things.
What Is Different Inside an MTP® Connector
US Conec lists the following features as distinguishing the MTP® connector from generic MPO connectors:
- Removable housing. The outer housing can be taken off after assembly. This lets the ferrule be re-worked and re-polished, lets the gender be changed (pins added or removed) after assembly or even in the field, and allows the end face to be scanned interferometrically after the connector is built.
- Floating ferrule. The ferrule can float inside the housing, so two mated ferrules keep physical contact while a load is applied to the cable or connector, for example when a patch cord is pulled sideways in a crowded panel.
- Elliptical stainless-steel guide pin tips. The guide pins are held to tight tolerances and have elliptical tips, which improves guidance as the pins enter the holes and reduces wear of the guide holes.
- Metal pin clamp. A metal clamp holds the pins and centers the push spring. US Conec states that this eliminates lost pins, centers the spring force and prevents fiber damage from the spring.
- Ribbon-friendly spring. The spring design maximizes clearance for 12-fiber and multi-fiber ribbon to prevent fiber damage.
- Boot options. Standard strain-relief boots are offered for round cable, oval jacketed cable, bare ribbon, and a short boot that reduces the footprint by 45%.
These are mechanical and serviceability features. They make the connector easier to rework, more stable under load and less likely to lose pins or wear its guide holes over many matings. US Conec also states that its MTP® connector is designed to exceed the TIA-568.3 durability requirement of 500 mate/demate cycles.
Generic MPO connectors vary by manufacturer. The standards fix the mating interface, not the internal design, so features such as a removable housing, ferrule float or a metal pin clamp may or may not be present. "Generic MPO" therefore describes a wide range of products, not a single design; ask your supplier for its connector's construction and loss grade.
What Is Exactly the Same
Because both follow the same interface standards, all of the rules that decide whether a link works apply to MTP® and MPO alike:
- Fiber counts and layouts: 8, 12, 16 and 24 fibers (and more), on the same 0.25 mm pitch.
- Gender: a male (pinned) connector must mate with a female (unpinned) one. This rule does not change with the brand.
- Key and adapter: the same key-up/key-down and key-up/key-up adapters.
- Polarity: Type A, B and C methods from TIA-568.3-D work identically. See our MPO polarity guide with wiring diagrams.
- Polish: multimode is normally flat (PC), single-mode is normally APC 8°. An MTP® APC connector must not mate with a flat MPO, and vice versa.
- MPO-16: a 16-fiber connector to TIA-604-18 (FOCIS 18) has an offset key and different guide pins, so it does not mate with MPO-12/24 whether the brand is MTP® or not.
In other words, choosing MTP® will not fix a gender, polarity or polish mismatch. Those must be designed correctly either way.
Performance: Ferrule Grade Matters More Than the Name
A common belief is that "MTP is low loss and MPO is high loss." The reality is more precise. US Conec itself explains that MTP® performance is driven by three factors: the grade of the connector components, achieving physical contact through good termination, polishing and spring force, and end-face cleanliness.
The component grade is set mainly by the MT ferrule. US Conec offers standard and low-loss MT ferrules, with these component specifications per mated fiber pair:
| US Conec MT ferrule grade | Typical IL | Maximum IL | Return loss |
|---|---|---|---|
| Multimode low-loss | 0.10 dB | 0.35 dB | > 20 dB |
| Multimode standard | 0.20 dB | 0.60 dB | > 20 dB |
| Single-mode low-loss | 0.10 dB | 0.35 dB | > 60 dB (8° APC) |
| Single-mode standard | 0.25 dB | 0.75 dB | > 60 dB (8° APC) |
Source: US Conec MT ferrule specifications. These are component figures, not values for any particular cable assembly.
US Conec also notes that, to reach a given grade, both the ferrule kit and the connector housing kit must be of that grade. A standard-grade MTP® connector is therefore not automatically "low loss", while many suppliers also offer MPO assemblies in low-loss grades. For comparison, TIA-568.3-D allows up to 0.75 dB per mated connector pair in a channel loss budget.
What matters for your link is the tested loss of the finished assembly. Ask for the loss grade in writing and a per-fiber insertion loss report (plus return loss for single-mode) for every assembly, whichever connector brand is used. Huawellux's specification for MPO and MTP® assemblies (identical for both) is insertion loss ≤0.35 dB for single-mode and multimode, with return loss >60 dB single-mode (OS2, APC) and >30 dB multimode (OM3/OM4/OM5). The same values apply to our MTP® and MPO versions. Every Huawellux product receives end-face visual inspection under a 400x video microscope and is tested for insertion loss (IL) and return loss (RL) before it ships. Interferometric end-face geometry (fiber height, coplanarity, end-face angle and radius) is checked by sample-based testing in standard production, and 100% interferometer testing of a batch is available on request. A formal test report is provided on request; state it in your RFQ.
MTP vs MPO Comparison Table
| Standard MPO | MTP® (US Conec) | |
|---|---|---|
| What it is | Generic connector type | Brand of MPO connector |
| Standards | IEC 61754-7, TIA-604-5 | Fully compliant with the same |
| Intermating | With any compliant MPO/MTP® | With any compliant MPO |
| Housing | Varies by maker; often fixed | Removable |
| Ferrule | Varies by maker | Floating |
| Guide pins | Varies by maker | Elliptical stainless-steel tips |
| Pin retention | Varies by maker | Metal pin clamp, centered spring |
| Gender change after assembly | Usually not | Yes (housing removal) |
| Loss grades | Standard and low-loss, by supplier | Standard and low-loss |
| Gender, polarity, polish rules | Same | Same |
When Should You Specify MTP® vs Standard MPO?
Specify genuine MTP® when:
- The project specification, consultant or end user names MTP® explicitly.
- Your team plans to re-polish, re-gender or interferometrically re-check connectors after assembly.
- Cables will see frequent re-patching or side loads in dense panels, where float and pin design help.
Standard MPO is usually sufficient when:
- The specification requires "MPO per IEC 61754-7 / TIA-604-5" with a defined loss grade.
- Assemblies are factory-built, tested and installed as fixed links that will not be re-worked.
- Budget or lead time matters, and the supplier can document loss and end-face geometry.
Write the specification precisely. Avoid using "MTP" as a generic word. Either write "MTP® connector (US Conec)" when you need the brand, or "MPO connector compliant with IEC 61754-7 and TIA-604-5" when you do not. In both cases, state the loss grade (for example, maximum insertion loss per mated pair), fiber count, gender per end, polish, polarity and the test report you expect. Our guide to MTP/MPO trunk vs patch cables covers which assembly type to order.
Frequently Asked Questions
Is MTP the same as MPO?
MTP® is a type of MPO. MPO is the standard multi-fiber connector type; MTP® is US Conec's trademarked MPO connector with added mechanical features. Every MTP® connector is an MPO connector, but not every MPO connector is an MTP®.
Can MTP and MPO connectors be connected together?
Yes. MTP® connectors comply with IEC 61754-7 and TIA-604-5 and mate with other compliant MPO connectors, provided the gender (male to female), fiber count, polish and polarity also match.
Is MTP lower loss than MPO?
Not automatically. Loss depends mainly on the ferrule grade, termination quality and cleanliness. US Conec low-loss MT ferrules are specified at 0.35 dB maximum, standard single-mode MT at 0.75 dB maximum. Compare the tested loss of finished assemblies.
Can I change the gender of an MTP connector?
Yes. The MTP® housing is removable, so pins can be added or removed after assembly. Most generic MPO designs are not intended for this.
Get MPO Assemblies Built to Your Specification
Huawellux builds MPO trunk cables, patch cords, breakout harnesses and enclosures at our factory in Shenzhen, to your fiber count, gender, polish, polarity, loss grade and length. We supply both genuine US Conec MTP® connectors and standard MPO connectors, so the choice follows your specification, not our stock. If your specification names MTP® or a specific loss grade, tell us when you request a quote and our engineers will match the connector and test report to it before production.
Dust caps are fitted on every connector, and a formal test report is available on request.
Huawellux replies to inquiries within 24 hours. Custom orders typically take 1–5 business days to complete production, with final timing confirmed case by case in the quotation. For special/custom requirements, MOQ is 2 km of fiber length. Standard listed patch cords have no formal MOQ. The sample fee is credited against the bulk order.
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MTP® is a registered trademark of US Conec Ltd.