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This 2pack MPO/UPC female fiber optic loopback tester cable adopts OM3 multimode 50/125m fiber with 16core design. Specially developed for highspeed 40G/100G network and QSFP module testing, it creates precise optical signal loopback to validate port performance and system stability. Compact, durable and plugandplay, these adapters are essential tools for data center construction, optical equipment debugging and highspeed network maintenance.