airFiber - Ethernet Negotiation Issues


Overview


This article includes the basic troubleshooting steps for failed Ethernet connections on airFiber devices.


Symptom and Steps to Troubleshoot


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Main Symptoms: 

  • Low Ethernet Negotiation.
  • No access over LAN.

Characteristics:

  • Can access via RF interface or management radio (if applicable).
  • Can not get LAN connection via switch or router port.
  • Can not discover airFiber.

Symptom Troubleshooting Steps

1.     Are you using shielded Ethernet cables? (e.g., TOUGHCable)

  • Yes: Continue to step 2.
  • No: Shielded Ethernet Cable is a requirement. TOUGHCable or equivalent should be installed.

2. Reboot the device.

  • If rebooting solves the negotiation issues, monitor the ethernet link.
  • If negotiation issues reemerge, Continue to step 3.

3. Plug directly into PoE Injector LAN port.   

  •    Now, do you get a LAN connection on your computer?
    • Yes: Try a different switch port. Done!
    • No: Continue to step 4.

4. Replace POE injector.

  •    Now, do you get a LAN connection on your computer?
    • Yes: Dispose of the damaged PoE injector. Done!
    • No: Continue to step 5.

5. Swap the short jumper cable that runs between the PoE Injector and the computer.

  •    Now, do you get a LAN connection on your computer?
    • Yes: Dispose of the damaged short ethernet jumper.
    • No: Continue to step 6.

6. Swap the ethernet cable between the radio and POE injector.

  •    Now, do you get a LAN connection on your computer?
    • Yes: Make sure your new cable is properly installed, terminated, and secured.
    • No: Continue to step 7.

7.     Is this device colocated on a mast with an FM transmitter?

  • Yes: There is a strong possibility of line interference. This is caused because FM transmitters operate on close to the same frequency of the Ethernet cables themselves.
    • Isolate the radio from potential EMI sources or use ferrite beads with shielded Ethernet cables.
  • No: Continue to step 8.

8. If all else fails, replace the radio with a known working radio, and double check cable termination and grounding.


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