This document specifies procedures to assess acoustic signals at passenger external doors applying to all kind of rolling stock. The following applies to this standard: - this document refers to acoustical passenger information indicating the release, opening and closing of passenger doors; - this document is applicable to tonal signals with defined frequency components levels and pulse sequences; - this document is not applicable to spoken information or to signals comprising a sequence of impulses (such as a door finding signal). NOTE – Acoustic door signals are defined in EN 16584 2 "Design for PRM use".