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Gigabit Fiber to Fiber Media Converter Module – Installation Guide
13
Troubleshooting
General
• Ensure the module is securely seated in the chassis. The
PWR LED on the module should be on solid.
• Ensure all cabling is of the correct type and is in good
operating condition.
• Ensure both devices on either end of the fiber are compatible.
If using a simplex fiber connection, ensure that you have both
an Upstream (U) and Downstream (D) Media Converters.
• For dual-stranded fiber connections, ensure the RX and TX
has been reversed between the two Media Converters.
No connectivity
If unable to get full connectivity with all DIP switches in the UP
position, these methods are recommended for troubleshooting.
Method 1
1. Turn off Fiber Negotiation (SW1 Down) on both media
converters. Leave all other switches UP.
2. Connect the near end device to port MM1, the LK1 LED
should be lit to indicate a good fiber connections. If the LK1
LED is not lit, then check the fiber cable and the attached
device.
3. Repeat step 2 for port MM2/SM2.
4. Return the media converter to the desired configuration.
Method 2:
The fiber connection can also be verified by configuring the remote
media converter for loopback mode. The LEDs on both media
converters should be lit. Data should pass through the local
converter then over the fiber connection to the remote media
converter.