Teledyne LeCroy UWBTracer User Manual - Manual (Page 243)

UWBTracer User Manual Chapter 13: Recording
LeCroy Corporation
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Capturing USB Cable Association Traffic
To capture the USB Cable Association traffic:
Step 1 Make sure the analyzer is in operational state.
Step 2 Hook one device to one of the USB ports marked as CHAN 0 and leave
the other device not connected. (Please note that CHAN 1 is not
operational for this function.)
Step 3 Make sure the devices are ready for association.
Step 4 Connect the second WUSB device to the other USB port marked as
CHAN 0.
At this point the association traffic capture of USB traffic between the two devices is done
automatically.
When detecting the connection context data passed between the two devices, the
analyzer stores the information in a table in memory and passes it to the UWB recording
channels. The analyzer can store multiple connection contexts for different pairs and use
them in real-time for decrypting WUSB traffic.
When a recording is terminated, the entire connection context table is uploaded to the
application software and stored in the Device List archive. This allows the analyzer to
retrieve the connection context information from the application and use it in further
recording sessions. If the Connection Context between two devices is already stored in
the application and the devices were NOT re-associated, there is no need to repeat the
association process.
Note:
• We assume here that the association procedure is done "automatically' once the
two WUSB devices are connected through a USB cable. If not, you may need to
initiate the association process manually.
• To capture the association traffic, the system is not required to be in a recording
state. However, to allow the real-time use of the captured connection context
information for decrypting the UWB traffic, the Analyzer must be at least
synchronized to the devices that were associated.