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The loopback adapter includes two fiber optic connectors that are inserted into the output and input ports of the device, used to send signals from communication devices and loop back the device to troubleshoot network faults of faulty nodes. The loop back adapter is made of PVC material, which has the effects of low loss, plug and unplug resistance, and high-speed transmission. Standard duplex LC/UPC connector, single-mode 9/125 SM fiber, enclosed fiber, can prevent obstacles and damage. Insert the LC/UPC connector and lock the mating cable in place, without the need for tools. The durable single unit structure provides long-term use.