Problem and solution when the optical port of the firewall is down

What if the optical port of the USG is not Up?

1. The negotiation modes, rates, and duplex modes on both ends shall be the same.
2. Check whether optical fibers and optical transceivers are correctly used.
-A multi-mode fiber can be used with a single-mode optical transceiver if the transmission distance is short.
-A single-mode optical fiber can only be used with a single-mode optical transceiver.
-Check whether the optical port and optical transceivers are incorrectly used together. For example, 100M optical ports are used together with 1000M optical transceivers.
-Check whether the optical transceiver is authenticated.
-Generally, a single-mode optical fiber is yellow, and a multi-mode optical fiber is orange.
3. Run the display interface xx command to check whether the wavelengths of the connected optical transceivers are the same and whether the distances are proper.
4. Run the display interface xx verbose command to check whether the receive or transit power of the optical ports is within the allowed range.
5. Connect the head and tail of a fiber to an optical transceiver to check whether the port can go Up.
6. If the fault persists, consider replacing the optical transceiver and optical fiber.

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