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This 2pack OM4 multimode fiber loopback test cable features 12core MPO/UPC female connectors with 50/125m duplex multimode fiber. It serves as a convenient selftesting tool for 40G and 100G highspeed networks, supporting QSFP module validation, port connectivity checks and predeployment testing. Durable and compact, it is widely used in data centers, communication laboratories and enterprise IT environments for fast, reliable fiberoptic performance verification.