Glossary Technology evolves at a rapid-fire pace. That’s why we’ve built an easy-to-use glossary to help you better understand the terms, technologies and trends that impact your business. Show only animated 0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z s S_ID S-CSCF S-GW SA SAE SAG SAN SAPI SBC SBS SBSMN SBus SC SC-FDMA SCS SCSI SD SDH SDL SDSL SDTV Segment SEQ_CNT SEQ_ID Service-Level Agreement (SLA) SES SESR Session Border Controller (SBC) Session Initiation Protocol (SIP) Set-Top Box (STB) SETG SETPI SETS SFN SFP SGF SGW Shared Ethernet SHDSL SIB Signal-to-Noise Ratio (SNR) Signaling Gateway (SGW) SIMO Simple Mail Transfer Protocol (SMTP) Simple Network Management Protocol (SNMP) Simplex Transmission Singlemode Fiber (SMF) SINR SIP SIP-AS SISO SLA SLF Slot Time SM Small Cell Small Computer System Interface (SCSI) SMF SMS SMTP SNI SNMP SNR SOF Softswitch (SS) Software-Defined Networking (SDN) SOH SONET SPA Spanning Tree SPDF SPE Spectrum SPI Splice Loss Splitter SQ SQM SS SS-RSRP SS-RSRQ SS-SINR SSB SSER SSMB SSS Standard-Definition Television (SDTV) Star Topology STAT Station Station Address STB STE STG STM Storage Area Network (SAN) STP STS SU-MIMO Submarine Network Subnet Subnet Mask SUI SUL SUT SVT Switch Symmetrical Digital Subscriber Line (SDSL) Symmetrical High-Speed Digital Subscriber Line (SHDSL) SYNC SyncE Synchronization Testing Synchronous Synchronous Digital Hierarchy (SDH) Synchronous Optical Network (SONET) System under Test (SUT)