MTP®/MPO Jumper, Harness, and Trunk Fiber Cables: What Are the Differences and How to Choose?

In high-density data centers, cloud computing facilities, and fiber optic cabling systems, MTP®/MPO multi-fiber connectors and their associated cable assemblies form the critical infrastructure supporting high-speed network transmission such as 40G, 100G, 200G, and 400G.

In practical deployments, the three most common cable assemblies are MTP®/MPO Jumper, MTP®/MPO Harness, and MTP®/MPO Trunk. These assemblies differ in structural design, connection methods, and application scenarios. This article introduces the structural characteristics and application differences of these three cable types to help select the appropriate solution when planning fiber optic cabling.

What Are MPO and MTP®?

Before understanding MTP®/MPO Jumper, Harness, and Trunk, it is necessary to first understand the basic concepts of MPO and MTP®.

• MPO (Multi-fiber Push On): MPO is a standard multi-fiber push-pull optical connector interface designed for high-density fiber connections. It provides stable connectivity and fast plug-and-play operation. As an industry-standard interface specification, MPO defines the mechanical structure, dimensional parameters, and interface format for multi-fiber connections and serves as the foundational standard for multi-fiber cable assemblies.
• MTP®: MTP® is a registered trademark of US Conec and is essentially a high-performance version of the MPO connector. It features enhancements in mechanical precision, insertion life, and dust protection while remaining fully compatible with MPO connectors at the physical interface level, allowing direct interconnection.

Although both follow the same international standards and are fully interoperable, MTP® connectors incorporate several engineering improvements:

• Durability: MTP® connectors use metal pin clamps to secure alignment pins, while standard MPO connectors typically use plastic clamps. The metal structure is less prone to damage during long-term use.
• Signal Integrity: MTP® connectors use a floating ferrule design that allows fiber end faces to maintain stable physical contact under load. Compared with many MPO connectors that use fixed ferrules, this design can significantly reduce insertion loss.
• Precision Alignment: MTP® connectors use elliptical stainless-steel guide pins, which reduce friction and debris generation during mating, allowing stable high-performance transmission even after repeated insertion cycles.

Introduction to MTP®/MPO Jumper, Harness, and Trunk

In high-density data center cabling systems, MTP®/MPO fiber assemblies perform different connection roles. Depending on the application architecture, common assemblies include MTP®/MPO Jumper、MTP®/MPO Harness and MTP®/MPO Trunk. Understanding their structural characteristics and applicable scenarios helps build an efficient and scalable fiber network architecture.

MTP®/MPO Jumper

MTP®/MPO Jumper, also known as a straight-through jumper, is a pre-terminated fiber cable with MTP®/MPO multi-fiber connectors on both ends. It is primarily used to achieve direct connections between devices.

Its core function is to support direct optical module connections, device-to-patch panel connections, and patch panel-to-patch panel short-distance links, serving as a short-range connectivity component in high-density cabling systems.

In practical deployments, MTP®/MPO jumpers are commonly used within the same rack or between adjacent racks, with typical lengths ranging from 1 to 30 meters. Typical application scenarios include:

• Direct connections between optical modules in data centers
• Cross-connections between high-density patch panels and equipment ports
• Short-distance fiber link testing and verification

MTP®/MPO Harness

MTP®/MPO Harness, also known as a breakout cable, features an MTP®/MPO multi-fiber connector on one end and multiple single-fiber, duplex, or multi-fiber connectors on the other end, such as LC, SC, MPO, or MMC connectors.

The primary function of this assembly is to enable conversion between high-density multi-fiber interfaces and traditional low-density interfaces, which plays a critical role during network upgrades or mixed-speed deployments. For example, in data centers, it can connect legacy servers with LC duplex ports to an MTP®/MPO backbone link, or split high-speed optical modules such as 1.6T or 800G into four 400G or 200G links to connect to end devices, enabling compatibility between devices operating at different data rates.

The figure below shows an MTP®/MPO Harness jumper S2MPOA2x4F, which converts a 1.6T link into four 400G links, allowing 1.6T OSFP switch to connect to ConnectX-8 network adapter.

MTP®/MPO Trunk

MTP®/MPO Trunk is the backbone fiber transmission component used within data centers or equipment rooms. Both ends typically use MTP®/MPO or LC connectors, but compared with jumpers, trunk cables feature:

• Higher fiber counts (such as 48, 72, 96, 144, or 192 fibers)
• Longer transmission distances
• Stronger mechanical protection structures

Common designs include dual-jacket structures to enhance tensile strength and installation stability. Within the cabling architecture, trunk cables mainly provide large-scale fiber aggregation between rack rows or different areas within a facility, such as backbone connections from the Main Distribution Area (MDA) to the Horizontal Distribution Area (HDA). Their core function is to build high-speed backbone channels in high-density cabling systems, supporting high-speed links such as 100G and 400G, while reserving sufficient fiber resources for future network expansion and speed upgrades.

How to Choose Between MTP®/MPO Jumper, Harness, and Trunk

In data center fiber cabling systems, Jumper, Harness, and Trunk serve different layers of connectivity. Selection typically depends on connection distance, interface structure, and cabling hierarchy:

• MTP®/MPO Jumper: Mainly used for direct connections between switches within the data center
• MTP®/MPO Harness: Used for interface conversion or high-speed link breakout
• MTP®/MPO Trunk: Used for large-scale backbone fiber transmission within equipment rooms

By combining these three types of assemblies appropriately within a cabling architecture, organizations can build a structured, scalable, and efficiently managed fiber infrastructure. NADDOD MTP®/MPO fiber jumpers are designed for the high-density cabling requirements of AI computing centers and high-speed data centers. They use G.657A bend-insensitive fiber and precision-polished APC ferrules, achieving a minimum insertion loss of 0.35 dB and a return loss of up to 60 dB, meeting the stable transmission requirements of 400G and 800G network environments.

The products undergo 3D geometry testing and extreme environment validation (operating temperature range −40°C to 85°C) and use LSZH (Low Smoke Zero Halogen) flame-retardant jackets. While improving cabling density, the products strictly comply with IEC and TIA international standards and support mainstream InfiniBand and Ethernet architectures, providing reliable physical-layer connectivity for long-term stable data center operation.

FAQ

Q: How do you choose between an MTP®/MPO jumper and an MTP®/MPO harness?

A: The choice mainly depends on the specific application scenario and network configuration requirements. For example, when directly interconnecting switches, an MTP®/MPO jumper is typically the better choice. If a high-speed port needs to be distributed to multiple lower-speed devices, an MTP®/MPO harness (breakout cable) provides a more suitable connection method.

Q: What is the difference between an MTP® connector and a standard MPO connector?

A: MTP® is a high-performance version of the MPO connector. Compared with standard MPO connectors, MTP® connectors include multiple optimizations in mechanical structure and optical performance, such as more precise alignment structures and improved spring-loaded ferrule design, resulting in better connection stability and overall performance.

Q: What are typical application scenarios for MPO breakout cables?

A: MPO breakout cables are mainly used in high-density fiber cabling environments in data centers. They are commonly used to connect MPO patch panels, trunk cables, and equipment ports. In spine-leaf data center network architectures, these cables are often used to enable large-scale parallel optical interconnections.

Q: Can fiber jumpers be customized according to specific requirements?

A: Yes. NADDOD can provide customized fiber jumper solutions based on actual deployment requirements, including fiber polarity configuration, outer jacket materials, and cable length, all of which can be designed on demand.