It Is Often difficult to route all the required traces on a PCB. There is a constant goal to keep costs at a minimum and so the number of layers available for routing is very limited. This can force designers to route traces too close to the edge of the PCB. Routing too close to the edge of the PCB can increase emissions from the edge of the ground-reference plane. Controlling these emissions is simply a matter of not routing highspeed signals near the edge of the ground-reference plane.
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