Using the RF Trends Window 451If the SNR, Associated Clients, or Receiver Threshold column is red, thisindicates that the threshold configured for this parameter has beenexceeded. (See “Changing Monitoring Settings” on page 552.)When looking at graphed data, you can see the data in absolute or deltavalues.Delta (rate of change) values are calculated with the following equation:value at end of polling interval - value at beginning of polling intervaltime difference (in seconds)To change how you view data values, select Absolute to see absolutevalues or Deltas to see rate-of-change values.Table 51 RF Trends ColumnsColumn DescriptionRadio MAP name and radio number.SNR Signal-to-noise ratio of the last data packet received by theradio.Throughput Rate at which data is transmitted by the radio, in bits persecond.Associated Clients Number of clients associated with the radio.Client Failures Combined number of the following types of errors:■ 802.1X failures■ association failures■ authentication failures■ authorization failures802.11 Packet Errors Number of frames received by the MAP radio that hadphysical layer errors on the active channel. These errorscan indicate interference from a non-802.11 device.Non-802.11 PHY Errors Number of times the radio detected energy on the activechannel that either was not recognizable as an 802.11frame, or was above the power level of background noise.Re-transmits Number of retransmitted packets sent from the client tothe radio on the active channel. Retransmissions canindicate that the client is not receiving ACKs from the MAPradio.Receiver Threshold Radio’s hearing sensitivity, in decibels (dB).
