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WiFi tips

Godt modtager signal skal ligge mellem -40 dBm til -65 dBm , ca. -45 dBm er bedst.

Noise floor er normalt -90 dBm til -100 dBm .

Et godt signal er omkring 32dBm over noise floor?

However, more important than a strong signal is the actual difference in signal & noise levels—called signal-to-noise ratio (SNR) that determines wireless speeds and user performance.

Rather than overextend cell size, reduce TX power to client levels & increase antenna gain. Pairing a UAP-AC-M with an external, hi-gain antenna is a very efficient way to improve signals across the WLAN.

15 dBm i "buffer" til tab er godt.

Lad være med at bruge de første kanaler i 5GHz, da mange bruger dem som standard. Vær opmærksom på DFS/radar.

Bredere kanaler, 40MHz osv, sender dårligere (mindre rækkevidde) da er kun er den samme "energi" til rådighed. Men kan give bedre båndbreade

Hidden node: The probability of a collision also increases whenever the distance between stations is so great that they cannot hear each other. This can also occur if obstacles exist between stations. This is known as the hidden node problem. For example, if Station A is close to the AP but far from Station B who is talking, Station A will wrongfully assume that the wireless channel is available and transmit, causing problems (collisions) at the listening AP.


UniFi tips


  • SSH into the AP and issue 'syswrapper.sh restore-default'
  • You can use the UniFi discovery tool (installed with the UniFi controller) to reset the UniFi AP to defaults.

Once the unit is reset it will come into default state, please try setting the inform URL by following these steps:

  • SSH into the AP and issue ‘syswrapper.sh restore-default’ to get back to factory settings.
  • SSH into the AP and type: mca-cli
  • Next type: set-inform http://ip-of-controller:8080/inform

ubnt / ubnt is the by default UniFi IP.

  • To reset the UniFi APs, power them on, and allow them to fully boot.
  • After they've booted, press and hold the small reset button (located on the back of the device) for 25+ seconds.
  • This should reset the UniFi APs and put them back into a discoverable state again.
  • If hard reset doesn't work then you try TFTP recovery: To TFTP recover firmware, please follow the instructions found here: http://community.ubnt.com/t5/UniFi-Troubleshooting/UniFi-TFTP-soft-recovery/ta-p/607605