12 Communications No. 34 “electronic communications market” means an area of activity identified by the Authority, as constituting a single market within the communications technology sector; “electronic communications network” means transmission systems and, where applicable, switching or routing equipment and other resources that permit the conveyance of signals by wire, radio, optical or other electronic means; “electronic communications numbering” means a number, sign or other mark that an electronic communications licensee, in the delivery of electronic communications services, uses to identify electronic communications facilities in order to connect between the place of transmission and the place of reception, or identify the type of content or transmission that the electronic communications facility is to deliver; “electronic communications services” means a service provided by one or more electronic communications network; “essential facilities” means facilities of an electronic communications network or service that__ (a) are exclusively or predominantly provided by a single or limited number of suppliers; and (b) are economically or technically difficult to substitute or duplicate in order to provide a service; “exempted licensee” means a licensee who is exempted from certain conditions in order to operate its activities; “exempted service” means a licensed service for which certain conditions and fees are not required by the Authority in order for the service provider to commence its operations; “facility services” means any services comprising electronic communication infrastructure, including earth station, fixed links and cables, radio communication transmitters and links, satellite hubs, satellite control station, submarine cables, and cable landing station; “frequency” means electromagnetic waves of radio communications frequencies propagated in space without artificial guide; “frequency allocation” means the reservation of one or more radio frequency bands for a particular use or uses; “frequency assignment” means the reservation of one or more radio frequencies for use by a particular entity in accordance with the national frequency plan;