This value is measured in decibels from zero to -120. Noise (dBm) in wireless communications is a combination of all unwanted interfering signal sources, such as crosstalk, radio frequency interference, distortion, etc. EIRP = Tx power (dBm) + antenna gain (dBi) - cable loss (dB). EIRP (Effective Isotropic Radiated Power) is the actual amount of signal leaving the antenna, measured in dB. Cisco can use range between 0 to -100, Atheros may use 0 to -127. Notes: RSSI values can be different depending on the chip vendor. Anything below -85dBm is generally unusable, and over -50dBm can be considered perfect. For wireless data communications, normal range is -45dBm to -87dBm. Smaller negative numbers represent a cleaner/stronger signal. RSSI) is the usable strength of the radio waves, expressed in decibels relative to a milliwatt between 0dBm (strongest) and -120dBm (weakest).
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