Performance issue on WIFI 5 GHZ

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Tomatoman
Tomatoman Posts: 12 image  Freshman Member
First Comment Second Anniversary
in Nebula

Hi all,

unfortunately I face a lot of trouble around Wifi 5 GHZ, I honestly have any clue what the reason might be. Often 5 GHZ is of for 10 minutes and only the 2.4 GHZ is then available.

Any idea what reason could be?

best regards

tomatoman

All Replies

  • GiuseppeR
    GiuseppeR Posts: 721 image  Guru Member
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Engineer Level 1 - Nebula 5 Answers First Comment

    Hi @Tomatoman

    I installed a huge number of APs and never faced huge issues with 5 GHz.

    Please could you share more info about your hardware and wireless scenario?

  • Zyxel_Melen
    Zyxel_Melen Posts: 4,749 image  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Hi @Tomatoman

    Could you help to provide:

    1. Your device's info.
    2. Is it Nebula mode or standalone mode? If is Nebula mode, please help to enable Zyxel support access.
    3. How often does this issue happen?
    4. What device is the issue client?
    5. What signal strength was it when this issue happens? Please help to check on the client.
    6. What percentage is the channel utilization of 5G band?

    https://community.zyxel.com/en/discussion/14234/nebula-how-to-turn-on-zyxel-support-access
    Zyxel Melen


  • Zyxel_Melen
    Zyxel_Melen Posts: 4,749 image  Zyxel Employee
    Zyxel Certified Network Engineer Level 1 - Switch Zyxel Certified Network Administrator - Switch Zyxel Certified Network Administrator - Nebula Zyxel Certified Sales Associate

    Also, you may have some adjustment:

    1. Check Nebula Event Logs: Go to Site-wide > Monitor > Event logs and filter for "Radar" or "DFS". This will confirm if the 5GHz radio is shutting down due to radar detection.
    2. Adjust 5GHz Channel: If radar detection is frequent, navigate to Site-wide > Configure > Access points > Radio settings. Try manually setting the 5GHz channel to a non-DFS channel (typically channels 36, 40, 44, or 48) to see if the stability improves.
    3. Reduce Channel Width: In the same Radio settings menu, ensure the 5GHz channel width is set to 40MHz or 20MHz instead of 80/160MHz. Wider channels are more likely to overlap with DFS frequencies.
    Zyxel Melen


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