While working in layout, how can I change layers and what is the shortcut key for that. I am working on 4 layers. And my PCB design tool is Pulsonix.

You can easily change the layers in Pulsonix. On pressing " L " software will allow you to swap in between the layer and will add via as well. It depends on your setting at Technology.

How to use differential pair setting in Pulsonix

1. First PIN pair is the first Net from where connection will start and end. Name the net and specify the PIN start point and PIN end point as shown in above image.
2. Second pair is the net connection from start to end connection.Define the Pin start and end point.
3. Minimum % paired. Is the part where the Pair are not together. And the start and final stage the are apart. Need to define that.
4. Define Maximum length difference can we have in the routing differential pair.
5. Edge coupled. Is the regular routing of differential pair. On single layer ( top / bottom). Running in parallel. 
6. Broadside: Is the one where pairs are running in two different layer but on top of each other. they get apart only at start point and end point. 

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