SACCH Slow Associated Control Channel

SAN Storage Area Network

SAP Service Access Point / Point d'accès service

SAP Service Advertising Protocol

SAP System Access Protocol

SAPI Service Access Point Identifier

SARM Set Asynchronous Response Mode

SAT Supervisory Audio Tone

SBC Sub Band Coding

SCCP Signalling and Connection Control Part

SCFM Sub-Carrier Frequency Modulation

SCH Synchronization Channel

SCI Serial Communication Interface

SCIP Switching Call In Progress

SCIT Special Circuit Interface for Terminals

SCM Sub Carrier Multiplexing

SCP Service Control Point

SCPC Single Channel Per Carrier

SCPS Synchronous Composite Packet Switching

SCRIBE Systèmes de Communication et de Réseaux Informatiques et Bureautiques Evolutifs

S&D Safety and Distress

SDA Sélection Directe à l'Arrivée (Télecommunications)

SDCCH Stand alone Dedicated Control Channel

SDH Synchronous Digital Hierarchy

SDLC Synchronous Data Link Control

SDM Space Division Multiplexing

SDM Sum of Depth Modulation

SDSL Symmetric Digital Subscriber Line (DSL)

SEP SCSI Encapsulation Layer (session protocol)

SET Secured Electronic Transaction

SET Standard d'Echange et de Transfert

SFERT Système Fondamental Européen de Référence pour la Transmission Téléphonique

SFH Slow Frequency Hopping Modulation

SF-LB Services et Facilités - Large Bande

SFP Small Form Factor Pluggable

SHTTP Secure Hyper Text Transfer Protocol

SIM Subscriber Identity Module

SIO Service Information Octet

SIP Session Initiation Protocol

SLC Satellite Link Control

SMB Send Message Block (Net BEUI)

SMB Server Message Block

SMDS Switched Multi-megabit Data Service

SMR Specialised Mobile Radio

SMS Short Message Service (GSM)

SMTP Simple Mail Transfer Protocol

SN Subscriber Number

SNA System Network Architecture

SNAT Source Network Address Translation

SNMC Service Network Management Centre

SNMP Simple Network Management Protocol

SNR Signal to Noise Ratio

SOAP Simple Object Access Protocol - See also Apache SOAP

SONET Synchronous Optical Network

SP Signalling Point (same as PS)

SPG Service Protocol Gateway

SPI Stateful Packet Inspection

SPX Sequenced Packet Exchange

SRES Signed Response

SRT Service Routing Transparent

SS Supplementary Services

SSAM Sous-Système d'Application Mobile

SSCP System Services Control Point

SSD Synchronous Space Division

SSEM Sous-Système d'Exploitation et de Maintenance

SSI Server Side Includes

SSID Service Set Identifier

SSMA Spread Spectrum Multiple Access

SSN SubSystem Number

SSO Single Sign On (security)

SSP Service Switching Point

SSTM Sous-Système de Transfert de Message

SSUR Sous-Système Utilisateur RNIS

ST Signalling Tone

STAR Service Téléphonique d'Assistance Rapide

STD Subscriber Trunk Dialing

STD Synchronous Time Division

STM Synchronous Transfer Mode

STP SAN Transport Protocol

STP Signalling Transfer Point

STS Synchronous Transport Signal

SYSOP System Operator