The look course of action for these PCBs consists of meticulous placement of components and routing of traces in order to avoid crossovers, as all connections has to be made on a single aircraft. When crossovers are unavoidable, jumper wires or zero-ohm resistors are used to bridge gaps. Zachariah Peterson https://felixgjlmm.bloguerosa.com/30604208/the-definitive-guide-to-16-layer-5-order-hdi-high-frequency-storage-server-pcb