I have a 14-layer SMT digital, polyimide, impedance controlled board per IPC-D-275,Class3. The coupon requires a section D. What really is the difference between Option 1 and Option 2 and how does the conductor routing for all of the layers work out in this section. o--------------o o o o o o o o / / o--- o o o o o o o o--- o o o o o o o \ \ o-------------o o o o o o o o The above is my best attempt at drawing a Section D, that I think I need. My question is about the routing between these vias....."so that the interconnects in a specific hole are separated to the greatest extent possible." (IPC-D-275 page 82 7.3.7.2 Option 2 third para- graph) Thanks ahead of time, DaveS