#Mpo 4 fiber loopback cable Patch
Just like fiber optic patch cable assemblies, fiber optic loopbacks are classified by single mode type and multimode type. The two most commonly used fiber optic loopbacks are SC type and LC type, while there are also ST, FC, and MTRJ, FDDI etc types. fiber optic loop backs are used in fiber optic test applications. Traditional fiber optic loopbacks can be regarded to be the two connectors on the same piece of simplex fiber optic patch cable put together, thus it forms a loop. Range ≤ 0.2 dB ( - 40 to +80 degree centigrade)įiber Optic Loopback Cable Brief Introduction Patch cords at both ends are the standard duplex A-to-B type.Fiber Optic Loopback Cable Specifications Method C: the pair-reversed trunk cable is used in Method C connectivity to connect the MPO modules one each side of the link. Therefore standard A-to-B type duplex patch cables are used on both sided. As mentioned, the fiber positions of Type B cable are reversed at each end. Method B: in Connectivity Method B, a Type B truck cable is used to connect the two modules on each side of the link. The patch cable on the left is standard duplex A-to-B type, while on the right a duplex A-to-A type patch cable is employed. In Method A, two types of patch cords are used to correct the polarity. A type-A trunk cable connects a MPO module on each side of the link. Method A: the connectivity Method A is shown in the following picture. The following part illustrates how the components in MPO system are used together to maintain the proper polarization connectivity, which are defined by TIA standards. 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. 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. MPO 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. MPO 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 MPO 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 have the same fiber position. MPO Trunk Cable Type A: Type A cable also known as straight cable, is a straight through cable with a key up MPO connector on one end and a key down MPO 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 type of MPO truck cables 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