User manual

www.cooperbussmann.com/wirelessresources
Cooper Bussmann 945U-E Wireless Ethernet Modem & Device Server User Manual
81Rev Version 2.14
Figure 83 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 “Iperf 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 84 lperf Throughput
The expected throughput will depend on a number of things, including the distance setting, selected channel width,
and whether you are using the internal Iperf utility or running Iperf externally on a laptop or PC (at both ends of
the link). The following table shows the estimated throughput results based on real world communications. These
estimates are not necessarily the maximum that are achievable in the modems, but are used more as a guideline to
determine the performance of the radio link.
The Iperf throughput result provides 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, or high noise or interference, or both. For RSSI or Received Signal Strength Indication, see
“4.1 Connectivity.” For information on checking interference or noise, see ”4.2 Channel Survey (Utilization).”