96
www.elpro.com.au
245U-E Wireless Ethernet Modem User Manual
Rev Version 2.24
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.
245U-E Radio Data Throughput
Distance
Iperf
20 MHz
10 MHz
5 MHz
1000 m
Internal
10.5 Mbps
7.5 Mbps
5. Mbps
1000 m
External
16. Mbps
10.5 Mbps
6. Mbps
3000 m
Internal
10. Mbps
7. Mbps
4.7 Mbps
3000 m
External
15. Mbps
9. Mbps
6. Mbps
5000 m
Internal
9. Mbps
6. Mbps
4.5 Mbps
5000 m
External
13. Mbps
8. Mbps
6. Mbps
10000 m
Internal
7. Mbps
5. Mbps
4. Mbps
10000 m
External
10. Mbps
7. Mbps
5. Mbps
Throughput and Repeaters
It should be noted that if you are using repeaters to extend the range, there will be a reduction in
throughput for each repeater hop. The 40-MHz Turbo channels rarely provide better throughput than the
20-MHz in the real world because they occupy a larger portion of the 2.4-GHz band and are more prone to
interference. For RSSI, see