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S-band   SAB/SAP   SAE   SafetyNET   Sampling   SART   SAW-filter   SBR   SCA   SCH   S-DMB   SDR   SDSL   Semi duplex   Serial port  Set-Top Box   SFA   SFN   SGSN   Short Range Device   Short Range Radar   SIM   Simplex   SIP   Single Frequency Network   SMIL   SMOS   SMS   SMS   SMS-CB   SMSC   SNMP   Soft handover   Software Defined Radio  Spectral Band Replication   Spectrum Overlay   Spectrum Pooling   Spectrum Underlay   Spider   Spread spectrum   Spurious emission   SRD   SRR   Star topology   STB   STiMi