Using the RF Trends Window 451
If the SNR, Associated Clients, or Receiver Threshold column is red, this
indicates that the threshold configured for this parameter has been
exceeded. (See “Changing Monitoring Settings” on page 552.)
When looking at graphed data, you can see the data in absolute or delta
values.
Delta (rate of change) values are calculated with the following equation:
value at end of polling interval - value at beginning of polling interval
time difference (in seconds)
To change how you view data values, select Absolute to see absolute
values or Deltas to see rate-of-change values.
Table 51 RF Trends Columns
Column Description
Radio MAP name and radio number.
SNR Signal-to-noise ratio of the last data packet received by the
radio.
Throughput Rate at which data is transmitted by the radio, in bits per
second.
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 failures
802.11 Packet Errors Number of frames received by the MAP radio that had
physical layer errors on the active channel. These errors
can indicate interference from a non-802.11 device.
Non-802.11 PHY Errors Number of times the radio detected energy on the active
channel that either was not recognizable as an 802.11
frame, or was above the power level of background noise.
Re-transmits Number of retransmitted packets sent from the client to
the radio on the active channel. Retransmissions can
indicate that the client is not receiving ACKs from the MAP
radio.
Receiver Threshold Radio’s hearing sensitivity, in decibels (dB).
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