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ADTRAN has applied its industry-leading carrier class expertise to the OCU 45, creating a product that meets the most stringent carrier class requirements. The OCU 45 offers transparent transport of T3/E3/STS-1 services over a fiber transport. The OCU 45 is available in singlemode and multimode versions. Measuring only one rack unit high the OCU 45 can be used standalone, wall mounted or mounted in 19-inch or 23-inch shelves, using an optional mounting tray. This compact device gives NSPs a convenient way to extend T3/E3/STS-1 services from their point of presence to their customer and provides enterprise users a powerful tool for extending T3/E3/STS-1 services over fiber in a campus environment.