TA Terminal d'Autorisation

TACS Total Access Communication System (UK)

TAMS Telephone Answering Message Service

TCAP Transaction Capability Application Part

TCH Traffic Channel

TCP/IP Transmission Control Protocol / Internet Protocol

TCP Transmission Control Protocol

TD Transmission des Données

TDM Time Division Multiplexing

TDMA Time Division Multiple Access

TELEX Teletypewriter Exchange

TELNET Telecommunications Network

TFM Tamed Frequency Modulation

TFTP Trivial File Transfer Protocol

TFTPD Trivial File Transfer Protocol Daemon

TFTS Terrestrial Flight Telecommunications (or Telephone) Service

THF Tremendously High Frequency

TIC Token-Ring Interface Coupler

TITAN Terminal Interactif par Téléphone et Appel par Numérotation

TKIP Temporal Key Integrity Protocol

TL Terminal de Ligne

TMN Telecommunications Management Network

TMSI Temporary Mobile Station Identity (same as ITAM)

TNR Terminaison Numérique de Réseau

TO Tone Only

TP Transport Protocol

TPL Transport Protocol Layer

TPP Téléphone Portatif Personnel

TS Time Slot

TTL Time to Live

TTS Transaction Tracking System

TTY Teletype

TUP Telephone User Part

Tx Transmission