450 CHAPTER 10: MONITORING THE NETWORK
Displaying RF
Environment
Statistics
To display RF environment statistics, in the RF Monitor window, select the
RF Environment tab at the bottom of the window.
Table 50 lists the information displayed on the tab.
Using the RF Trends
Window
The RF Trends window shows current and past 802.11 statistics for
radios. You can view statistics up to 30 days old, and display graphs of
data trends.
If data does not appear in the window, check the bottom of the window
for a message. If the message Error: The requested service is not enabled
is displayed, you need to enable the RF Monitor options on the
monitoring service. By default, the monitoring service does not provide
RF data to the Monitor tab. To enable the service to provide RF data,
enable the RF Monitor options on the Monitoring Settings tab of the
3WXM Service Setup window. (See “Changing Monitoring Settings” on
page 552.)
Table 51 lists the information displayed in the top section of the RF Trends
window.
Table 50 RF Monitor Environment Columns
Column Description
Channel Radio channel to which the other columns apply.
Noise Noise threshold on the active channel. RF Auto-Tuning
prefers channels with low noise levels over channels with
higher noise levels.
CRC Errors Number of frames received by the radio on that active
channel that had CRC errors. A high CRC error count can
indicate a hidden node or co-channel interference.
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.
Pkt Re-transmissions 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.
Utilization Number of multicast packets per second that a radio can
send on a channel while continuously sending fixed size
frames over a period of time. The number of packets that
are successfully transmitted indicates how busy the
channel is.
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