How to Apply Base-24 MTP/MPO Cabling for 40/100G

Updated on Nov 25, 2021

With 10G commonly used in larger enterprises, migration from 10G to 40G to 100G is underway to meet the demands for greater bandwidth. Under such circumstances, Base-24 MTP cabling plays an important role. What is Base-24 MTP cabling? How to apply 24-fiber MPO cabling in 40G/100G? Get details in this post.

What Is Base-24 MTP Cabling?

A Base-24 MTP/MPO cabling is a cabling solution based on 24-fiber MTP fiber optic connectors or fiber optical links based on increments of 24 fibers. In a Base-24 system, each Base-24 connector, or MTP-24 connector, offers twenty-four fibers and provides additional density versus three MTP-8 connectors or two MTP-12 connectors.Figure 1: MPO-24 Connector

How to Apply Base-24 MTP Cabling in 40G/100G?

As network needs are getting increasing from 10G to 40G or 100G for more advanced applications, the traditional Base-2 cabling system tends to convert to Base-24 MTP cabling to some extent. Since a two-fiber duplex LC port takes the same space as a single MTP port, while the MTP port can contain up to 24 fibers with an MTP-24 connector, providing much higher connection density. With MTP-24 connectors, various Base-24 MTP cabling solutions are available for 40G/100G applications. Here are four typical Base-24 MTP cabling solutions:

Solution 1: MTP-24 Duplex Applications With MTP Cross Connections

As the figure shows below, the MTP-24 trunk cable could connect to a 24-fiber MPO-LC cassette module, realizing the conversion from Base-24 to Base-2 connectivity. The polarity B trunk cables manage the port polarity in a similar fashion to the MTP-8 and MTP-12. Using such MTP-24 trunks could get two and three times of port density than MTP-8 and MTP-12 trunks respectively. In addition, a 144-fiber trunk cable using MTP-24 subunits occupies approximately 30 percent less area than the MTP-12 equivalent, making MTP-24 trunk more popular for high density applications.

Figure 2: Base-24 MPO Cabling With MPO Cross Connections

Solution 2: MTP-24 Duplex Applications With LC Cross Connections

Unlike the MTP-24 duplex applications with MTP cross connections, this Base-24 cabling solution uses two additional LC-LC connections in the middle, which increases network flexibility when you don’t have additional MTP-24 trunk cables. Supporting duplex LC, this design offers duplex and parallel configurations on optic fibers.

Figure 3: Base-24 MPO Cabling With LC Cross Connections

Solution 3: MTP-24 Connection With Conversion Cable

Actually, the MTP-LC duplex modules in solution 1 could be replaced by MTP/MPO conversion cables as shown in the following figure. This change increases the panel connectivity density greatly. In this new solution, the 12-port duplex LC module (or MTP-24 to 12x LC duplex MTP cassette) can be replaced with an adaptor housing 8 MTP ports. Thus, the eight MTP-24 connectors/trunks can support a total of 192 fibers in the same module space. Compared to MTP-8 ports in the same module space, MTP-24 solution is three times in panel density for QSFP applications.

Figure 4: Base-24 MPO Cabling With Conversion Cables

Solution 4: MTP-24 MTP Cabling in Parallel Applications

Compared to MTP-8 or MTP-12 systems, MTP-24 systems can also support a wider range of parallel applications. For example, MTP-24 offers direct connection for 100G SR-10 application over ten pairs of MMF in a 10x 10G configuration. Even if some vendors have extended the 100G SR-10 application to 120G over 12x 10G, the Base-24 MTP cabling could also handle with no issue.

Figure 5: Base-24 MPO Cabling in 100G and 120G Parallel Applications

In the 120G parallel applications, the 120G ports can be configured as 12 individual 10G links for server connection over MTP-24 to 12 duplex LC harness cables. And they can be divided into three 40G links for network switch connection. These applications are best supported with MTP-24 trunks and MTP-24 harnesses or breakouts.

Figure 6: Base-24 MPO Cabling in 120G Parallel Applications


From all the above, the Base-24 MTP/MPO cabling using MTP-24 connector is perhaps the most cost effective solution to deploy both parallel and duplex fiber optic applications. The MTP-24 connector offers higher fiber density and expedites the cleaning and inspection time concerning the installation of the MTP systems when compared to three MTP-8 connectors or two MTP-12 connectors.

Related Resource:

MTP® High-Density Data Center Cabling Solution

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