TA Terminal Adapter TACS Total Access Communication System TAF Terminal Adapting Function TAPI Telephony Application Programming Interface TAS Telephone Answering Service TASI Time Assigned Speech Interpolation TBR Technical Basis for Regulation (ETSI) TCAP Transaction Capability Application Part (SS7) TCH Traffic CHannel (GSM) TCN Train Communication Network TCP Transmission Control Protocol (IP suite) TCP/IP Transmission Control Protocol/Internet Protocol TCSEC Trusted Computer System Evaluation Criteria TD Trasmissione Dati TDD Time Division Duplex(ing) (cordless) TDM Time Division Multiplexing TDMA Time Division Multiple Access TDVB Terrestrial Digital Video Broadcasting TE Terminal Equipment TELESAT Telecommunications Satellite Corporation TEN-IBC Trans-European Networks-Integrated Broadband Communications TETRA Trans European Trunked RAdio TFM Tamed Frequency Modulation (un tipo di CPM) TFO Transcoder Free Operation (voice encoding) TFTP Trivial File Transfer Protocol (IP suite)d TI Technician Interface (telnet) TIA Telecommunications Industries Association (USA) TIFF Tag Image File Format TIM Telecom Italia Mobile TINA-C Telecommunications Information Networking Architecture Consortium TL1 Transaction Language 1 TLS Tunable Laser Source TMN Telecommunications Management Network TOA Time Of Arrival TOS Telecommunications Operating System TOS Type Of Service (IP) TP Transmission Protocol TPC Transmit Power Control TPDU Transport Data Protocol Unit TPEG Traffic Protocol Expert Group TP-PMD Twisted Pair - Physical Medium dependent (FDDI) TQB Total Quality Benchmarking TQM Total Quality Management TRAU Transcoder Rate Adapter Unit (GSM) TRIP Trade-Related Intellectual Property TSAP Transport Service Access Point TSAPI Telephony Server Application Programming Interface TSAT T1 Small Aperture Terminal TSI Time-Slot Interchange TSN Transitional Security Network TTC Tracking, Telemetry and Command subsystem TTL Time To Live (IP) TUP Telephone User Point (SS7) TVRO Television Receive Only TVSAT TeleVision Small Aperture Terminal TWTA Travelling Wave Tube Amplifier