Annular Ring
Check minimum size of annular ring.
- Drill Layer Setting: Define the drill layer in ODB++ file layer structure.
- Select Drill Layers: Select drill layer from the layer list.
Figure 1. 
- Layer Name: Drill layer name section. After selecting drill layer(s), a line for each selected layer will be generated in the table.
- Drill Connecting Layers: Specify the drill layer connecting physical layers as starting and ending layers in the Drill Setting dialog.
- Select Drill Layers: Select drill layer from the layer list.
- Stack-up Definition: Define the stack-up of PCB.
Figure 2. 
- Physical Number: Physical layer section. Upon double-clicking column, the physical layer list dialog opens.
- Layer Name: In the physical layer dialog, select matching physical layer by name.