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SQL/DS Structured Query Language/Data System
SRA Selective Routing Arrangement
SS Special Services
SSAS Station Signaling and Announcement Subsystem
SSB Single-SideBand
SSBAM Single-SideBand Amplitude Modulation
SSC Special Services Center
SSCP Subsystem Services Control Point
SSO Satellite Switching Office
SSP Signal Switching Point
SSP Sponsor Selective Pricing
SSP System Status Panel
SSPC SSP Controller
SSPRU SSP Relay Unit
SSTTSS Space-Space-Time-Time-Space-Space network
ST STart
STC Serving Test Center
STC Switching Technical Center
STD Subscriber Trunk Dialing
STDM Statistical Time Division Multiplexing
STP Signal Transfer Point
STS Shared Tenant Service
STS Space-Time-Space network
SVC Switched Virtual Circuits
SVS Switched Voice Service
SWB SouthWestern Bell
SX SimpleX signaling
SXS Step by (X) Step
SYC SYstem Control
SYSGEN SYStem GENeration
T Tip
T1/OS T1 carrier OutState
T1FE T1 carrier Front End
TA Terminal Adaptor
TA Transfer Allowed
TAC Terminal Access Circuit
TAP Telephone Assistance Plan
TAS Telephone Answering Service
TASC Technical Assistance Service Center
TASC Telecommunications Alarm Surveillance and Control system
TASI Time Assignment Speech Interpolation system
TAT TransAtlantic Telephone
TC Timing Counter
TC Toll Center
TCAP Transaction Capabilities Applications Port
TCAS T-Carrier Administration System
TCC Trunk Class Code
TCG Test Call Generation
TCM Time Compression Multiplexer
TCM Trellis Coded Modulation
TCR Transient Call Record
TDAS Traffic Data Administration System
TDC Tape Data Controller
TDC Terrestrial Data Circuit
TDD Telecommunications Device for Deaf
TDM Time Division Multiplexing
TE Terminal Equipment
TE Transverse Electric
TEHO Tail End Hop Off
TELSAM TELephone Service Attitude Measurement
TERM TERMinal
TFLAP T-carrier Fault-Locating Applications Program
TFS Trunk Forecasting System
TGC Terminal Group Controller
TGN Trunk Group Number
TH Trouble History
TIA Telephone Information Access
TIRKS Trunk Integrated Record Keeping System
TLM Trouble Locating Manual
TLN Trunk Line Network
TLP Transmission Level Point
TLTP Trunk Line and Test Panel
TM Transverse Magnetic
TMDF Trunk Main Distributing Frame
TMMS Telephone Message Management System
TMR Transient Memory Record
TMRS Traffic Measurement and Recording System
TMRS Traffic Metering Remote System
TMS Time-Multiplexed Switch
TN Telephone Number
TN Transaction Number
TNDS Total Network Data System
TNN Trunk Network Number
TNOP Total Network Operation Plan
TNPC Traffic Network Planning Center
TOPS Timesharing OPerating System
TOPS Traffic Operator Position System
TP Toll Point
TPMP Total network data system Performance Measurement Plan
TR Test Register
TR Transfer Register
TREAT Trouble Report Evaluation Analysis Tool
TRMTR TRamsMiTteR
TRR Tip-Ring Reverse
TSCPF Time Switch and Call Processor Frame
TSCPF Time Switch and Central Processor Frame
TSI Time Slot Interchanger
TSO Time Sharing Option
TSORT Transmission System Optimum Relief Tool
TSP Test SuPervisor