MTP MODE PATCH
The TIA standard also defines two types of duplex fiber patch cables terminated with LC or SC connectors to complete an end-to-end fiber duplex connection: A-to-A type patch cable-a cross version and A-to-B type patch cable-a straight-through version.įigure 5: Two Types of Duplex Fiber Patch Cables. However, all the methods should use duplex patch cable to achieve the fiber circuit. The fiber sequence of Type C cable is demonstrated in the following picture.ĭifferent polarity methods use different types of MTP trunk cables. The fiber at position 2 at one end is shifted to position 1 at the opposite end etc. For example, the fiber at position 1 on one end is shifted to position 2 at the other end of the cable. However, in Type C each adjacent pair of fibers at one end are flipped at the other end. MTP Trunk Cable Type C: Type C cable (pairs flipped cable) looks like Type A cable with one key up connector and one key down connector on each side. The following picture shows the fiber sequences of a 12 fiber Type B cable. The fiber at P1 at one end is mated with fiber at P12 at the opposing end.
This type of array mating results in an inversion, which means the fiber positions are reversed at each end. MTP Trunk Cable Type B: Type B cable (reversed cable) uses key up connector on both ends of the cable. The fiber sequence of a 12 fiber MTP Type A cable is showed as the following: For example, the fiber located at position 1 (P1) of the connector on one side will arrive at P1 at the other connector. This makes the fibers at each end of the cable to have the same fiber position. MTP Trunk Cable Type A: Type A cable, also known as straight cable, is a straight through cable with a key up MTP connector on one end and a key down MTP connector on the opposite end. In this part, the three different cables will be introduced firstly and then the three connectivity methods. To match these standards, three types of MTP fibers with different structures named Type A, Type B and Type C are being used for the three different connectivity methods respectively. The three methods for proper polarity defined by TIA 568 standard are named as Method A, Method B and Method C. Three Cables for Three Polarization Methods However, for pre-terminated, high-density MTP/MPO cabling systems, polarity issues must be addressed. In common cabling systems, connectors such as LC and SC can easily be matched, so there is no polarity issue. When in use, it is necessary to ensure that the receiving end and the transmitting end are in an interconnected state, and such matching between the transmitting end and the receiving end at both ends of the optical link is known as polarity. For example, the optical module has a receiving end (Rx) and a transmitting end (TX).
The special design (shown in the following figure) of MTP/MPO connector ensures the accuracy of the polarity in the MTP/MPO network system.īut, what is polarity? A general optical link requires two optical fibers to complete the entire transmission process. The MTP/MPO connector is a multi-innovative, high-performance fiber optic connector that has enhanced optical and mechanical performance.
You can also refer to our white paper Understanding Fiber Polarity for completed polarity guide of our products. To ensure the MTP/MPO systems work with correct polarity, the TIA 568 standard provided three methods, which will be introduced in this article. Maintain the correct polarity across a fiber network ensures that a transmit signal from any type of active equipment will be directed to receive port of a second piece of active equipment – and vice versa.
MTP MODE HOW TO
However, the network designers face another challenge that how to assure the proper polarity of these array connections using multi-fiber MTP/MPO components from end-to-end. It's proved that MTP/MPO system is the answer to solve cable congestion in data centers or enterprises, because it featured flexibility, reliability and scalability.