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Troubleshoot Media Converter in a Network

Media Converters are designed for easy use in optical fiber transmission. When the connection does not work as expected after setting it up in a network, we need to do some troubleshooting. The checking include but not limited to the following six aspects:

1. The POWER LED on the media converter is off and the unit is not receiving power.


  • Verify that the power cord is securely connected to the power source and to the DC connector on the back panel of the media converter.
  • Check that the power outlet has power by connecting another device to it.
  • Try to use another power adapter of the same type that came with your media converter.
  • Verify that the voltage from the power source is within the required levels for your region.

2. The SYS LED on the media converter is off.


  • An internal component on the unit is damaged or not working properly. Try power cycling the unit. If power cycling does not work, contact the supplier for help.

3. The SYS LED on the media converter is blinking slowly.


  • An error is presented in this unit. Try power cycling the unit. If it doesn’t work, remove and re-install the SFP module or try another SFP module. Check the SFP module is the correct type for the application.

4. Network performance between the twisted-pair port on the media converter and an end node is slow.


  • There might be a duplex mode mismatch between the port and the end node. This occurs when a twisted-pair port using Auto-Negotiation is connected to a device with a fixed duplex mode of full-duplex. If this is the cause of the problem, just adjust the duplex mode of the port on the end node or on the media converter so that both ports are using the same duplex mode.

5. There is no communication with the devices connected to the media converter.


  • The fiber optical cables connected to the TX and RX end are reversed.
  • The RJ45 port isn’t connected correctly with the devices (pay attention to the connecting method of straight-through and crossover cables).

6. When the media converter is applied for the network, the whole link of the network can not communicate constantly.


  • The attenuation of the fiber link may be too large. At this moment, just use an optical power meter to test the optical power at the receiving end. If the optical power exceeds its normal sensitivity range, the faulty communication might be caused by the failed fiber link.
  • The connection between media converter and network switch not working well. Connect the fiber media converter with PC instead. If the media converter works well with PC, then there is something wrong with the network switch.
  • Or the media converter is faulty. Connect the two ends of the media converter to the PC directly. If there is nothing wrong with PING in both ends, just transfer a large file (such as 100M) from one end to another end and focus on the speed. If the speed is very slow (more than 15 minutes below 200M), the media converter can be judged as faulted.



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