MPO is the generic multi-fibre push-on connector defined in IEC 61754-7 and TIA-604-5. MTP is a registered trademark of US Conec for an MPO-compliant connector with a removable housing, floating ferrule, elliptical guide pins and a metal pin clamp. MTP and MPO connectors intermate. The practical differences are serviceability, mechanical consistency and the loss grades on offer.
MPO is the standard, MTP is a brand
MPO (multi-fibre push-on) describes a connector interface: the MT ferrule, the guide pin and hole positions, the key and the push-pull latch. Any manufacturer can make a connector to IEC 61754-7 and TIA-604-5 and call it MPO. Those standards fix the dimensions that let connectors from different makers mate.
MTP is a registered trademark of US Conec for its own MPO-compliant connector family. The name is usually expanded as multi-fibre termination push-on, though in practice it is a brand name rather than a technical category. When people search for "MTP vs MPO" or ask what MTP stands for, the useful answer is this: MTP is one specific, enhanced MPO design, and it plugs into the same adapters and transceiver ports as any other MPO connector.
Both use the same MT ferrule formats, so an MTP connector comes in the same fibre counts as MPO: 8, 12, 16, 24 and higher, in multimode and single-mode, with flat or angled polish.
What the MTP design adds
US Conec publishes several mechanical features for MTP connectors. Some generic MPO designs now include similar features, so the right question for any supplier is which of these their connector has.
| Feature | MTP connector | What to ask of a generic MPO |
|---|---|---|
| Housing | Removable, so the ferrule can be re-polished and the pin gender changed after assembly | Can the gender be changed after assembly, or is the connector fixed as built? |
| Guide pins | Stainless steel pins with elliptical tips, intended to reduce wear on the guide holes over repeated matings | What pin material and tip shape is used? |
| Pin retention | Metal pin clamp that holds the pins and centres the push spring | How are the pins retained, and can they be lost during handling? |
| Ferrule mounting | Floating ferrule, so the mated ferrules stay in contact when the cable is pulled sideways | Does the ferrule float inside the housing? |
| Spring | Oval spring that leaves more clearance for ribbon fibre behind the ferrule | Is the fibre path behind the ferrule protected from tight bends? |
| Loss grade | Standard and low-loss (Elite) ferrule grades | What is the maximum insertion loss per mated pair, and is it measured on every fibre? |
None of these features change the interface. They affect how consistent the connector is from one mating to the next, how well it survives handling, and whether it can be reworked.
Do MTP and MPO connectors intermate?
Yes. Because MTP connectors are built to the MPO interface standards, an MTP plug mates with a generic MPO plug through a standard MPO adapter, and either type plugs into an MPO transceiver port. Intermating still follows the normal MPO rules:
- One connector in each mated pair must be pinned and the other unpinned.
- Fibre counts must match, and 16-fibre connectors use an offset key that will not mate with 12-fibre connectors.
- Angled (APC) connectors mate only with angled connectors, and flat with flat.
- The key orientation through the adapter must suit the polarity method of the link.
The loss of a mixed pair depends on both ferrules. A low-loss MTP connector mated to a standard-grade MPO connector will not perform like a low-loss pair, so a loss budget that relies on low-loss connections needs low-loss connectors on both sides of every pair.
What actually sets the loss
The brand name alone does not set the insertion loss. Loss in a multi-fibre connection comes from the lateral offset of each fibre, the gap between fibre ends, the angle between end faces, and contamination. Those depend on ferrule moulding tolerances, guide hole and pin tolerances, polish geometry and cleanliness.
For design, TIA-568 allows 0.75 dB per mated connector pair, and that allowance applies to MPO and MTP pairs. Low-loss grades from connector makers sit well inside it, and suppliers state their own maximums. Ask for the maximum insertion loss per mated pair as a written figure, and ask how it is tested: against a reference-grade connector, or in random mating with production connectors. A random-mating figure is closer to what you will see in the field.
This matters most in short-reach parallel optics, where the channel loss limit is small. Our guide to building a fibre loss budget shows how quickly MPO pairs use up the allowance.
When to specify MTP and when generic MPO is enough
Specify MTP by name when:
- the network design or the end client's standard names MTP components;
- the channel has several mated pairs on a tight loss budget, such as a 100G or 400G multimode link with cassettes or a cross-connect;
- you expect to change connector gender or rework connectors during the life of the installation.
A well-made generic MPO connector is usually adequate when the link has margin, for example a single trunk between two panels well inside the reach limit, or patch cords where the budget has room. In both cases, judge the assembly by its measured loss per fibre and its end-face inspection results, not by the connector name.
How to write MTP or MPO in a purchase order
Write "MTP" only if you need the trademarked component. Otherwise describe the requirement, which gives suppliers room to offer either:
- Connector: MPO to IEC 61754-7, or MTP where named in the specification.
- Fibre count per connector: 8, 12, 16 or 24.
- Gender at each end: pinned or unpinned.
- Polish: flat (UPC) for multimode, APC for single-mode parallel optics.
- Polarity: Type A, B or C.
- Maximum insertion loss per mated pair, with the test method stated.
- Test report with loss on every fibre and end-face inspection images.
Radix builds MTP and MPO cable assemblies, including MTP OM3 48-fibre patch cords, to the customer's drawing. Send your requirement through the request a quote page and ask for MTP and generic MPO options side by side if you want to compare them.
Questions buyers ask
What does MTP stand for?
MTP is usually expanded as multi-fibre termination push-on. It is a registered trademark of US Conec for its MPO-compliant connector. In practice it names a brand of MPO connector, not a separate connector standard.
Is MTP better than MPO?
MTP is a specific MPO design with a removable housing, floating ferrule, elliptical guide pins and a metal pin clamp. Those features help consistency and allow rework. A well-made generic MPO can still meet a tight loss budget, so compare measured loss per mated pair rather than the name.
Can I plug an MTP cable into an MPO adapter or panel?
Yes. MTP connectors are built to the MPO interface, so they fit standard MPO adapters, cassettes and transceiver ports. The usual rules still apply: one pinned and one unpinned connector per pair, matching fibre count, and matching polish.
Can I change the gender of an MPO connector?
On an MTP connector the housing can be removed and the guide pins added or taken out, which changes the gender. Many generic MPO connectors are fixed once assembled. Changing gender is a skilled task, so most buyers order the correct gender from the start.
Do I need MTP connectors for 400G?
No. 400G modules specify an MPO interface, and any compliant connector of the right type will fit. What matters is the fibre count (MPO-12 or MPO-16), APC polish for single-mode, the polarity and a loss per mated pair that fits the channel budget.
Are MTP and MPO connectors the same size?
Yes. Both use the same MT ferrule and the same housing footprint, and both fit the same adapter cut-outs. You cannot tell them apart by size, only by markings and by mechanical details such as the housing and pin design.