RFS, Radio Frequency Systems, is a commercial company working in the field of wireless communication equipment (cable, Base station subsystem, diplexer and parabolic antenna).
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GERAN is the radio part of GSM/EDGE together with the network that joins the base stations (the Ater and Abis interfaces) and the base station controllers (A interfaces, etc.) The network represents the core of a GSM network, through which phone calls and packet data are routed from and to the PSTN and Internet to and from subscriber handsets.