With the continuing efforts to increase product functionality while decreasing product size, designers are being asked to place more and more functionality on individual printed circuit boards (PCBs). As PCBs become more densely populated, many new challenges arise. For boards containing circuits that interface with outside-piant tip/ring pairs, one such challenge is maintaining immunity to lightning strikes and unintentional power-line contact (power cross). This article explores this challenge as it relates to PCB layout. Through experimentation and analysis, this article provides designers with data to use as a tool when laying out circuits that will interface with outside plant wiring.
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