3Com 3CRWX120695A WXR100 RF Trends Columns, Can indicate interference from a non-802.11 device

448CHAPTER 16: MONITORING THE NETWORK

Table 57 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.
Authorized Clients	Number of authorized 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).
Noise Floor (dBm)	Received signal strength at which the MAP can no longer
	distinguish 802.11 packets from ambient RF noise. A value
	around -90 or higher is good for an 802.11b/g radio. A
	value around -80 or higher is good for an 802.11a radio.
	Values near 0 can indicate RF interference.

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 500.)

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)