User manual

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Cooper Bussmann 245U-E Wireless Ethernet Modem & Device Server User Manual
85Rev Version 2.19
3. Enter the IP address of the remote device that you want to test, and then click Measure Throughput.
Figure 89 Iperf
The specified IP address must be running Iperf in Server mode. If the remote modem does not have the Iperf
server running, you will get the error message “perf error, check connectivity to server.” Ensure that it has been
enabled and reset the module. Each time you click Measure Throughput, a 10-second TCP throughput test is
performed.
You will see the message “Performing Iperf Test,” and if you look at the modules you will see the TX/Link and
RX LEDs flashing quickly as it performs the test. After about 10 seconds, a graph appears showing the actual
throughput over the 10-second period and a calculated average.
The graph below shows the data throughput range between 8 and 14.5 Mbits per second with an overall
average of 10.9 Mbits per second. It is recommended to perform this throughput test a number of times to get
a better sample of the overall throughput.
Figure 90 Iperf Throughput
The expected throughput will depend on a number of things, including the distance setting, selected channel
width, and whether using the internal Iperf utility or running Iperf externally on a laptop or PC (at both ends of the
link). The following table shows real-world throughput estimates based on channel selection and receiver signal
levels. Throughput is calculated using the built-in Iperf utility and communicating TCP/IP over the three bandwidth
channels (20 MHz, 10 MHz, and 5 MHz). These estimates are not necessarily the maximum achievable for the
modems, but are used as a guideline to determine the performance of the radio link. See “Appendix D - EXTERNAL
IPERF TEST” for details on using the external Iperf throughput test.
The Iperf throughput results provide an excellent measure of the performance of a radio link. In general, if the
results you get are much worse than the best-case values listed below, it is a certain indication that the radio link
has either poor RSSI, high noise and interference, or both.