How to Make Fiber Optic Loopback Plug ?
To create a physical fiber optic loopback plug or configure a local loopback can help diagnose a suspected hardware problem. Creating a physical loopback is recommended because it allows you to test and verify the transmit and receive ports. If a field engineer is not available to create the physical loopback, you can configure a local loopback for the interface. The local loopback creates a loopback internally in the Physical Interface Card (PIC).
If you want to creat a fiber optic loopback plug for an RJ-45 Ethernet interface, you have to create a fiber optic loopback plug, cross pin 1 (TX+) and pin 3 (RX+) together, and cross pin 2 (TX-) and pin 6 (RX-) together. You need these equipment to create the loopback: a 6-inch long CAT5 cable, an RJ-45 connector, a crimping tool. When you create and then test a physical loopback, you are testing the RJ-45 interface 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.
If you want to creat a physical loopback for a fiber-optic interface, you have to create a physical loopback at the port, connect the transmit port to the receive port using a known good fiber cable, but make sure you use single-mode fiber for a single-mode port and multimode fiber for a multimode port. 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.
To configure a local loopback without physically connecting the transmit port to the receive port, follow these steps: 1,In configuration mode, go to the following hierarchy level. 2, Configure the local loopback. 3, Verify the configuration. 4, Commit the change. When you create a local loopback, you create an internal loop on the interface being tested. A local loopback loops the traffic internally on that PIC. A local loopback tests the interconnection of the PIC but does not test the transmit and receive ports. On an Ethernet interface, you cannot create a remote loopback, therefore there is no option to use a local or remote statement. Simply including the loopback statement at the hierarchy level, places the interface into local loopback mode.
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Sophenol fiber optic loopbacks are designed to provide a media of return patch for a fiber optic signal, typically it is used for fiber optic testing applications or network restorations.
