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Connecting more than one Device Under Test
USB analyzers are able to analyze traffic coming only from devices connected under them. If a device is
connected above the analyzer, it will only register data packets coming from the host. Figure 2b shows
an incorrect connection: the USB mouse is connected 'above' the analyzer.
Figure 2b – Wrong connection with more than one Device Under Test (DUT)
When the analyzer is used to analyze multiple devices, this analysis must necessarily involve a USB hub.
In this way, you can ensure that all the devices to be analyzed are, in fact, 'below' the analyzer. You
should be aware that the analyzer will record all hub and devices traffic. Though it could result in a large
amount of data, this won't cause inconvenience because the software's functions can filter out extra
traffic very easily. Figure 2c illustrates how to connect correctly several devices under test.
Figure 2c – Correct connection with more than one Device Under Test using a hub
Device Under Test
Analysis computer
Test Computer
Device Under Test
USB hub
Test Computer
Analysis computer
