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RSU Remote Switching Unit
RTA Remote Trunking Arrangement
RTL Resistor-Transistor Logic
RTM Regional Telecommunications Management
RTM Remote Test Module
RTS Remote Testing System
RTU Remote Trunking Unit
RTU Right To Use
RUM Remote User Multiplex
RWC Remote Work Center
RX Remote eXchange
S Sleeve
SAC Service Area Code
SAC Service Area Computer
SAC Special Area Code
SAG Street Address Guide
SAI Serving Area Interface
SALI Standalone Automatic Location Identification
SAMA Step by step Automatic Message Accounting
SAR Store Address Register
SARTS Switched Access Remote Test System
SAT Special Access Termination
SAT Supervisory Audio Tone
SBMS Southwestern Bell Mobile Service
SBS Skyline Business Systems
SC Scanner Controller
SC Sectional Center
SCAT Stromberg-Carlson Assistance Team
SCC Specialized Common Carrier
SCC Switching Control Center
SCCS Specialized Common Carrier Service
SCCS Switching Control Center System
SCF Selective Call Forwarding
SCM Subscriber Carrier Module
SCO Serving Central Office
SCOT Stepper Central Office Tester
SCOTS Surveillance & Control Of Transmissions System
SCP Signal Control Point
SCP Signal Conversion Point
SCP System Control Program
SCPC Signal Channel Per Carrier
SCPD Supplementary Central Pulse Distributor
SCU Selector Control Unit
SCX Specialized Communications eXchange
SD&D Specific Development & Design
SDIS Switched Digital Integrated Service
SDL Specification and Description Language
SDLC Synchronous Data Link Control
SDN Software-Defined Network
SDOC Selective Dynamic Overload Controls
SDP Service Delivery Point
SDR Store Data Register
SDS Switched Data Service
SDS Synchronous Data Set
SDSC Synchronous Data Set Controller
SEAS Signaling Engineering and Administration System
SEL SELector
SES Service Evaluation System
SF Single Frequency
SFMC Satellite Facility Management Center
SG SuperGroup
SGML Standard Generic Markup Language
SGMP Simple Gateway Management Protocol
SI Status Indicator
SIC Silicon Integrated Circuit
SID System IDentification
SIT Special Information Tone
SLC Subscriber Loop Carrier
SLE Screening Line Editor
SLIC Subscriber Line Interface Circuit
SLIM Subscriber Line Interface Module
SM Switching Module
SMAS Supplementary MAin Store
SMAS Switched Maintenance Access System
SMASF SMAS Frame
SMASPU SMAS Power Unit
SMDF Subscriber Main Distributing Frame
SMDI Subscriber Message Desk Interface
SMDR Station Message Detailed Recording
SMG SuperMasterGroup
SMS Service Management System
SMSA Standard Metropolitan Statistical Area
SMTP Simple Mail Transfer Protocol
SNA System Network Architecture
SNADS System Network Architecture Distribution Service
SNET Southern New England Telephone
SOAC Service Order Analysis Control
SOC Service Oversight Center
SOH Service Order History
SONAR Service Order Negotiation And Retrieval
SONDS Small Office Network Data System
SP Signal Processor
SP Signaling Point
SPAN Space Physics Analysis Network
SPAN System Performance ANalyzer
SPC Southern Pacific Communications
SPC Stored Program Control
SPCS Stored Program Control Systems
SPI Serial Peripheral Interface
SPUC/DL Serial Peripheral Unit Controller/Data Link