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245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
System Log File
Shows an event log of the modules operation, used for diagnosing problems.
The page can be saved and emailed to ELPRO if requested. “Clear System Log”
will clear the log file and start fresh.
Reset
Resets the module.
Factory Default
Configuration
Loads the factory default configuration and resets the module.
CAUTION Loading the factory default configuration will overwrite any
current configuration.
4.7 Testing Radio Paths
Connection and Signal Strength
The general procedure for radio range testing a link is fairly simple. Configure two units to form a link using
automatic radio rates. Install the access point at a fixed location. Take a laptop computer and the client to
each of the remote locations, and analyze the link using the Connectivity webpage. If a beacon is heard
from the access point, the client will update its Connectivity webpage with the received signal strength of
beacon messages from the access point.
If the signal is strong enough, a link may be established and the Connectivity webpage of the access point
may be opened. If the link is weak, the LINK LED will turn off and the remote Connectivity webpage of the
access point will fail to load. Using this procedure, the signal strengths of units at both locations may be
analyzed, and traffic is sent between the units while remote webpages are opened.
Iperf Throughput Test
A more thorough test of radio paths is a throughput test, which will check the amount of data that can be
reliably achieved via the wireless link. There are a number of software tools that you can use to check the
data throughput, such as FTP (File Transfer Protocol), Iperf, and Qcheck. The preferred application is “Iperf,”
which has been configured in each modem and can be enabled to perform this test. It can also be run
externally using laptops at either end of the radio link. The Iperf/Jperf application can be downloaded from
http://sourceforge.net/projects/iperf/.
All of the above applications measure the raw data throughput. From this you can determine the amount of
interference from the measured and calculated data throughput levels. The way Iperf works is that a server
is enabled at one end of the link and a client at the other. The Iperf client then passes data over the link
and calculates and displays the throughput accordingly.
The Iperf server can be run internally on the modem by enabling this feature on the Advanced Radio
page of one of the modems (see “4.4 Throughput Test”). It can also be run externally on a PC or laptop
connected at each end of the radio link. For a detailed procedure on using Iperf to externally check radio
data throughput, see “Appendix D - EXTERNAL IPERF TEST.”
The internal Iperf is a basic cut down version of the standard Iperf and should be used as a guide only. For a
more comprehensive test, Iperf should be run externally using laptops or PCs at each end of the Wi-Fi link.
