Loopback test is a useful and effective testing method to troubleshoot an optical module and Ethernet switch interface. Generally, the short-range optical module and multimode optical fiber are selected to perform the loopback test, and the received optical power needs to be checked through the optical module information query command to ensure that the received optical power is lower than the maximum threshold value of the received light. When performing the external loopback test, prevent the received optical power is too high to affect the module. Optical attenuator is necessary when testing a long-haul optical transceiver.Ģ. If the indicator light keeps on, the port of hardware functions correctly, if not, further troubleshooting is required.ġ. Step 4: Checking the indicator light of the interface. Install the isolated ends of the single strand of fiber or loopback cable to the Tx and Rx ports of the optical transceiver. Step 2: Insert an optical transceiver into the Ethernet switch. Pull apart the duplex connectors of both cable ends and remove the collars. Step 1: Isolate a single strand of fiber from a duplex fiber cable. The single strand of fiber can get via a duplex fiber, as the following steps show. Optical transceiver loopback test is performed by connecting the transmitter and receiver of the same optical transceiver, to verify if the hardware of the transceiver interface is working properly.įirst of all, before performing a loopback test on an optical transceiver, we need a loopback cable or a single strand of fiber. External loopback guide on the optical module: Take all locally generated transmit data and return it to the receive data path. Run loopback internal command to place the interface in loop internal mode to Internal loopback test is generally configured on the Ethernet switches. How to perform a loopback test on an optical module Internal loopback guide on the optical module: External loopback must be performed at the site. To create a loop, the external loopback requires a cable to physically loop the transmitter signal into the receiver port. External loopback: A loopback test to verify whether the interface correctly sending and receiving packets.Internal loopback can be performed without access to a remote site. It is used to test if the port hardware of the module is working properly in the switch. Put simply, internal loopback refers to data looped internally from Tx to Rx through the internal chip. Internal loopback: A loopback test performed between the transmitter and receiver of a module itself.Soft loopback: A loopback test performed via network management software. That is, data can be directly looped back to receivers through their own transmitters.
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