|Technical informations - Systems|
European Radio Message System
Developed in 1990 by the European Telecommunications Standards Institute. Strictly a European format with no known US implementations. It supports alphanumeric, numeric and tone paging. ERMES operates at a constant speed of 6250 bps and uses 4 level FSK signalling. This protocol uses a dedicated frequency spectrum in the 169 MHz range and supports 16 adjacent channels. The pagers are designed such that each pager is assigned to a specific time
slot and when the pager senses it is not in its 'home' system it begins its roaming routine by scanning all channels.