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This OM4 multimode MPO/UPC 16core fiber optic loopback test cable features 50/125m duplex fiber and female MPO connectors, specially engineered for 40G/100G highspeed network and QSFP transceiver testing. Adopting UPC polishing technology, it delivers lowloss signal loopback for precise port validation, hardware debugging and performance testing. The 2pack design provides flexible deployment for multidevice network maintenance and testing scenarios, widely compatible with data center switches, servers and highspeed optical communication equipment.