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This OM4 multimode MPO fiber loopback test cable features a 16core MPO/UPC female connector with 50/125m duplex multimode fiber. It serves as a handy selftesting tool for 40G and 100G highspeed networks, supporting QSFP module verification, port diagnostics and network predeployment testing. Compact and robust, it is widely used in data centers, communication labs and enterprise IT environments for fast, reliable fiberoptic connectivity checks.