![]() ![]() A Type B adapter will reverse the polarity. The Type B adapter will mate both key-up to key-up connectors, transmitting the signal from fiber 1 in the first cable to fiber 12 in the second cable. A Type A adapter will maintain the polarity. Mating adapter types and polarity-The Type A adapter will mate key-up with key-down connectors, transmitting the signal from fiber 1 in the first cable to fiber 1 in the second cable. Different equipment manufacturers or applications might require different polarity types.Įach element in an MPO system-trunk, adapter, and patch cord-is individually classified by Type A, B, or C and contributes to maintaining polarity. Knowing which is appropriate depends on your architecture’s design. However, no one polarity type is better than another. Type A and B are the most common types of polarity used in data centers and CORDs while Type C is more typical of duplex applications. Type C (or twisted pair method): The fiber located at P1 on one end arrives at P2 on the opposing end, P2 arrives at P1, and so on for each pair of fibers.Type B (or inverted method): The fiber located at P1 on one end arrives at P12 at the other end.Type A (or straight-through method): The fiber located at position 1 (P1) on one end also arrives at P1 on the other end.Polarity-Polarity simply refers to the way fibers are arranged inside the cable. There are three essential tests you should always perform to ensure the quality of your link: 1) polarity-type validation, 2) continuity confirmation, and 3) inspection. Some providers of MPO-terminated cables use Erika violet colored jackets for OM4 cables, to visually differentiate them from OM3 cables, which are colored aqua. The key is located offset to the left for MPOs with 16 or 32 fibers.īesides helping to determine the fiber positions, the key also ensures that the connector can be inserted only one way into an MPO adapter or transceiver port.įor MPO APC connectors, the “peak” formed by the 8-degree angle will be on the same side as the key. MPOs with 8, 12 or 24 fibers have a connector key in the center. P1 to P12 on the first row and P13 to P24 on the second row. For MPO connectors with multiple rows, numbers also follow from top to bottom, i.e. When the connector key faces up (referred to as “key up”), the positions of the fibers within the connector run in a sequence from left to right from position 1 (P1) to position 12 (P12). The role of the alignment pins is to ensure that fibers are facing each other perfectly.Ĭonnector key-MPO connectors have a key on one side of the connector body. Mating only male connectors with female connectors is primordial to avoid damages (male-on-male) and ensure continuity. Male and female connectors-Unlike single-fiber connectors, which are all male, MPO connectors can be male (with pins) or female (with corresponding guiding holes). Illustrated here are the three standardized fiber-polarity types: Type A (commonly called straight-through), Type B (commonly called inverted), and Type C (commonly called twisted-pair). Additionally, the MPO-32 is made up of two rows of 16 fibers each. ![]() The MPO-16 also exists on the market, made up of one row of 16 fibers. More and more, CORDs are using the MPO-24. Higher-density connectors also exist, composed of several rows of 12 fibers (e.g., 24, 36, 48). The most common type of connector is the MPO-12, which has one row of 12 fibers. ![]() That’s why some manufacturers introduced Erika Violet-colored connectors for OM4, to distinguish them from aqua OM3.Ĭonnector types-Each jacket houses multiple fibers that are also color-coded based on a common standard. ![]() However, having one color (aqua) for two different specifications can be confusing. Multimode multifiber connectors have flat ferrules (also referred to as PC or UPC), and the recommended cable jacket colors are aqua for OM3 and OM4, and lime for OM5. Because yellow represents either OS1 or OS2 specifications, it’s important to read the cable specifications carefully. Singlemode multifiber cable jackets are yellow, and they generally come with angled physical contact (APC) connectors. MPO connectors are made for both singlemode and multimode multifiber cables. MPO connector designĬolor coding-MPO connectors can be color-coded to help you easily distinguish between the different types and specifications. Automated fiber-endface analysis eliminates guesswork, complies with applicable standards, and provides consistent results regardless of experience. ![]()
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