78
www.cooperbussmann.com/wirelessresources
Cooper Bussmann 945U-E Wireless Ethernet Modem & Device Server User Manual
Rev Version 2.14
Figure 77 RX Noise Floor Minutes
The Channel Survey page also shows two other screens not shown here that indicate the percent channel utilization
and noise floor in one-hour intervals. The screens will only show the last 24-hour period.
4.3 Custom Survey
Custom Survey is essentially the same as the Channel Survey (explained in the previous section), except that the
three channel utilizations can be turned on or off, showing the different amount of traffic-related data.
Percent Radio TX
Any transmitted messages from the radio to other devices.
Percent Radio RX
Any DSSS messages received by the radio (basically any radio data from either
ELPRO or competitor radios).
Percent Busy (CCA
or Noise)
Clear channel assessment (CCA) is the detection of any ongoing transmissions or
noise, for example, from devices such as wireless I/O, 900 MHz FHSS, cordless
phones, or RC devices.
By configuring the different chart options, you can get a clear idea of the amount of data being transmitted and
received, and the amount of other noise that can be heard at the radio. Configure what is to be logged on each
chart, select a time interval and save changes, and the charts will then be displayed below the settings. Click the
button again to manually redraw the graphs. Each graph will display a percent channel utilization using the selected
criteria and time interval (seconds, minutes or hours).
Example 1
In Figure 78, chart one shows the amount of data that is being transmitted over a radio link, and chart two shows
the amount of data being received from all sources (interference and other noise). Notice that there is very little
outgoing data, but you can see a constant stream of data being received.
Figure 78 Custom Survey 1
