To provide adequate solution to Electro Magnetic Compatibility (EMC) problems encountered in airborne systems, several facts have to be acknowledged: o Avionic systems are extremely volume sensitive o Avionic systems are very weight and cost sensitive. This results in little use of shielded cables as they are heavy and costly. o The RTCA DO – 160D standard is very stringent, with some chapters even more strict than the military standards. o The use of filtered connectors has become the ultimate solution for EMC problems in general, and for meeting the RTCA DO – 160D standard requirements in particular. The advantages of the filtered connectors are presented in a number of parameters: o The filtered connectors are identical in dimensions to standard connectors. This allows the realization of a solution without changing the original system dimensions simply by replacing the existing interface connectors with filtered ones. o A filtered connector can tackle conduction problems (CE and CS) as well as radiation problems (RE and RS) and transient problems. o A filtered connector simplifies the procurement and logistics operations as it requires handling a single item. o Filtered connectors are much more efficient than the PCB spread out solutions. A connector π filter reduces interferences at frequencies above 30MHz up to 40dB more than a similar PCB spread out filter. To demonstrate this assumption is a fact, and in response to one of our customers – a leading producer of avionic systems - we performed an experiment comparing a spread out filter with a filtered connector of similar component parameters.