MTP/MPO Polarity
Today in professional networks Structured cabling, fiber cables 12 MTP / MPO are used frequently to conexionar equipment for its small size and high versatility. The aim is to unite the transmission signal (Tx) on a switch port to the signal corresponding receiving (Rx), this feature is called polarity. Unlike duplex traditional Fibre Optic Cable - LC or SC patched with a Tx and Rx connector on each end-MTP cable 12 fibers coalesce 12 fibers in one MPO connector, so management polarity becomes more complex. According to TIA standards, there are three types of polarity: type A, type B and type C. Different types of polarity cables may have different applications. We will introduce particularly cable polarity MTP type B and its applications.
General information about MTP / MPO cable Polarity Type-A, Type-B and Type-C
A cable type is standard for the second polarity, and extremely versatile. This cable assembly can be used to connect directly between 40G QSFP + optical transceivers, so it is commonly known as QSFP / QSFP + cable or 40GBASE-SR4 direct connection. As you can see in the diagram, this cable has a polarity "straight" and will lead to Pin 1 to Pin 12 relationship. This is very useful because the 40G optical use parallel optics, ie, instead of alternating Tx and Rx in a double-sided pattern, the port will look like the following diagram.
Often it referred to as MTP 40G cable, the cable type B standard for the second polarity, and extremely versatile. This cable assembly can be used to connect directly between 40G QSFP + optical transceivers, so it is commonly known as QSFP / QSFP + cable or 40GBASE-SR4 direct connection. As you can see in the diagram, this cable has a polarity "crusade" and will lead to Pin 1 to Pin 12 relationship. This is very useful because the 40G optical use parallel optics, ie, instead of alternating Tx and Rx in a double-sided pattern, the port will look like the following diagram.
Often referred to as MTP 40G cable, the cable is the third type C standard for polarity, and extremely versatile. This cable assembly can be used to connect directly between 40G QSFP + optical transceivers, so it is commonly known as QSFP / QSFP + cable or 40GBASE-SR4 direct connection. As you can see in the diagram, this cable has a polarity "cross pairs" and will lead to Pin 1 to Pin 12 relationship. This is very useful because the 40G optical use parallel optics, ie, instead of alternating Tx and Rx in a double-sided pattern, the port will look like the following diagram.
Most 40G fiber optic networks do not require perfect symmetry of ports: any Tx Rx can go anywhere. This means that the fiber 12 may interact with fiber 1 because it is Tx and Rx connector inserted therein, but at the other end.
MTP Cable types with polarity A, B and C
12-fiber cable MTP / MPO and MTP / MPO cable LC 4xDúplex are most commonly used in data centers. Genres MTP / MPO are divided into male and female. Therefore, in terms of trunk cable MTP, there are three types of combinations: female-female, male-female and male-male. 4xDúplex LC for cable are also available with MTP / MPO Male-Female cable.
The most used are the MTP / MPO connectors female.
MTP / MPO Cable Applications
Since the MTP / MPO cables have male and female, 1 male and 1 female to be interconnected it is required. Male pins fit into the female guide holes to ensure accurate alignment of fiber. The structure of the male and female connectors makes the connection between the same gender can not occur without signal loss or damaged connector itself. In the case of opposite gender confront a simple or necessary to perfectly align these adapter lossless substantial signal adapter panel.
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