A term related to wireless transmission and the occupation of RF spectrum. It is typically used in Europe to denote equipment used to support broadcasting, news gathering, theatrical productions and special events, such as culture events, concerts, sports events, conferences and trade fairs. In North America, the use of spectrum to provide these services is usually called broadcast auxiliary service or BAS.
Typical examples include theatrical wireless-microphone use, wireless-camera newsgathering operations and fixed point-to-point microwave links. The most significant PMSE users use wireless microphones, talkback systems, and/or in-ear monitors.