Redline Communications AN-50e Specifications download pdf (Page 25)

the testing software. This is where it first becomes apparent that Iperf is better suited to run tests

at high speeds. As the signal level is lowered it gets closer to the thermal noise floor. This in

effect decreases the SNR without the use of a noise source. The results are shown in Figure 5.2.

The same tests were run using Iperf as the software to both generate and measure the traffic

levels. The results shown in Figure 5.3 show a similar trend. Most noticeably the throughput is

consistently higher when there is a large amount of received power. The steps show a similar

structure for the first three level reductions. The wide fluctuations that are seen as the signal

level gets very low is probably due to a shorter testing time with Iperf then with IP traffic. The

modulation was probably adapting during the duration of these tests and it didn’t run for a long

enough time to average that out.

In both sets of tests the throughput minimum is observed at about –86 dBm, corresponding to the

manufacturer’s specification for received signal sensitivity.

Throughput vs RSSI

-90 -80 -70 -60 -50 -40 -30 -20 -10 0

Recieved Signal Strength(dbm)

Throughput (Mbps)

Fig. 5.3 Throughput Vs. RSSI data from IPERF.

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Redline Communications AN-50e Specifications Page 25