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a loopback test is a test in which a signal is sent from a communication device and looped back to the device as a way to determine whether it is functioning well or as a way to troubleshoot a defective node in the network. As for fiber optic loopback testing, optical loopbacks are used to verify the operational reliability of the device. Using fiber optic loopback cable or fiber optic loopback module for data transmission, the signal emitted by the device is looped from the transmit (Tx) end of an active component back to the receive (Rx) end of the same component. Applications: R&D Fiber labs Telecom testing FTTX testing Specifications: Fiber type: Single-mode 9/125 Fiber connector: LC/UPC Jacket material: PVC (Yellow) Insertion loss:≤0.3dB Return loss:≥50dB Warranty: 1-Year