Analysis of information sources in references of the Wikipedia article "Electrical connector" in English language version.
the stationary (more fixed) connector of a mating pair shall be designated J or X ... The movable (less fixed) connector of a mating pair shall be designated P
By its design the traditional failure mode in tin plated connections, fretting corrosion, is prevented.
Gold is generally specified as a contact coating for low level signal voltage and current applications, and where high reliability is a major consideration
Gold is generally specified as a contact coating for low level signal voltage and current applications, and where high reliability is a major consideration
the stationary (more fixed) connector of a mating pair shall be designated J or X ... The movable (less fixed) connector of a mating pair shall be designated P