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Create a Physical Loopback for a Fiber-Optic Interface
Action
To create a physical loopback at the port, connect the transmit port to the receive port using a known good fiber cable.
 | Note: Make sure you use single-mode fiber for a single-mode port and multimode fiber for a multimode port. |
Meaning
When you create and then test a physical loopback, you are testing the transmit and receive ports of the PIC. This action is recommended if a field engineer is available to create the physical loop as it provides a more complete test of the PIC.
