Noise offsets

The radio modules in the WLAN devices can specify the signal and noise levels as absolute values (in dBm). However, the receivers are not calibrated ex-factory. To specify optimal values for noise and signal levels, the noise offsets table can be used to set correction values (in dB) for each frequency band (2.4 / 5 GHz), channel, and WLAN interface. These values are added to the noise and signal values as supplied by the radio modules.

Command prompt: Setup > WLAN > Noise-Offsets

• BandFrequency band for which the noise-offset value is specified. Possible values:
  • 2.4 or 5 GHz
  Default:
  • 2.4 GHz
• ChannelChannel for which the noise-offset value is specified. Possible values:
  • Valid channel descriptors for the selected frequency band; max. 5 characters
  Default:
  • Blank
• InterfacePhysical WLAN interface for which the noise-offset value is specified. Possible values:
  • Selection from the list of available WLAN interfaces.
  Default:
  • WLAN -1
• ValueNoise-offset value in dB. This is added to the values output by the radio module. Possible values:
  • Maximum 4 digits.
  Default:
  • Blank
  Important: The operator of the WLAN can determine the values for noise offset with the appropriate measuring equipment. The values can vary depending on production-related variances, aging and environmental factors. Should it be necessary to define exact values for signal level, then the values have to be determined for each device individually, and they should be checked on a regular basis. LANCOM supplies standard values for some models only. Due to the variances mentioned earlier, LANCOM assumes no liability for the accuracy of these values.