A: The red LED is indicating a poor connection. Disconnect and re-insert the fiber. If the LED doesn't turn green in about 30-45 seconds, disconnect the fiber and use the fiber cutting tool to snip off a small piece of the fiber. Re-insert the fiber and you should see the green LED in about 30-45 seconds.
If the LED is still red, try inserting a fiber from another connection. If after about 30-45 seconds the LED turns green it indicates that the fiber may be bad or it has too tight or too many bends. If the LED remains RED, you may have a bad channel on the module. Please reach out to the Grace Sales Team at Sales@Grace-Eng.com if the error persists.