This specification covers the requirements for application of 3.9-mm pitch 85-ohm and 100-ohm CP and DPO STRADA Whisper connector system. This connector system uses a modular concept and interconnects two printed circuit (pc) boards. The connectors are available in CP and DPO header assemblies. Each header assembly consists of a vertical plug and a right-angle receptacle that connect to the pc board via eye-of-needle (EON) compliant pin press-fit contacts. The differential pair contacts are arranged pair in-row (PiR) or pair incolumn (PiC). These header assemblies mate to standard receptacles having the same contact arrangement.