In this mode the generator is actively sending out packets, with no feedback as to the responses coming back from the device under test. Users must specify enough time between transmissions of packets for the reply packet from the device under test. In IntelliFrame mode the generator actively looks for the response from the device under test and issues the next appropriate packet once the response has been completed. This way, the data length returned from the device under test can vary and does not need to be precalculated. Also, the generator automatically issues the Start of Frame when the frame time is up, regardless of the time it took for the device under test packets to appear.
Users can create traffic generator files by several methods.
Captured USB traffic can be exported into a text file format that can then be played back out through the generator module. Captured and exported files can be modified to allow for legal or illegal conditions that may be desired for complete and rigorous testing of devices. New traffic files can be created using a text editor and the library of commands available and documented with the USBTrainer product. The USBTrainer software is an application program that enables the user to control the generator. USBTrainer Plug-in 1.0 lb.