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Spirent KB Article
Doc ID: FAQ16390
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Spirent TestCenter: How can I preview a device block with many devices?
You should be able to determine the devices by just looking at the increment values.
If you have a streamblock created using those devices, you can do a preview on the streamblock to see how it used the devices.
If you don't already have a streamblock but need something to see visually, you can temporarily copy those values into a raw streamblock and look at the preview tab.
Product : Spirent TestCenter,PGA