T
TACS
Total Access Communications System (an AMPS variant deployed in a number of countries principally the UK)
TAP
Transferred Account Procedure; the essential charging methodology for international GSM roaming. There have been four TAP standards, TAP1, TAP2, TAP2+ and TAP3. The latter offers variable record length and is sufficiently flexible to support all future requirements arising from the move to 3G
TBR
Technical Basis for Regulation (part of the ETSI standardisation process)
TCH
Traffic Channel
TD-CDMA
Time Division CDMA
TD-SCDMA
Time Division-Synchronous CDMA; a CDMA variant developed by Chinese vendors which is claimed to offer high data rates and greater coverage
TDD
Time Division Duplex; a radio technology for use in unpaired spectrum. WCDMA/UMTS includes a band for TDD mode usage and both PHS and DECT use this technology
TDMA
Time Division Multiple Access; a technique for multiplexing multiple users onto a single channel on a single carrier by splitting the carrier into time slots and allocating these on a as-needed basis
Telematics
A wireless communications system designed for the collection and dissemination of information, particularly refers to vehicle-based electronic systems, vehicle tracking and positioning, on-line vehicle navigation and information systems and emergency assistance
TETRA
Terrestrial Trunked Radio; a European developed digital private mobile radio technology which is now being extensively deployed worldwide
Tetrapol
A competitive digital PMR technology to TETRA developed by French vendors
TFTS
Terrestrial Flight Telephone System
Timeslot
A frame within a TDMA schema; has a time interval of 576 microseconds. Physical content of a timeslot is known as a burst. Five different burst types exist, they are distinguished by different TDMA frame divisions (see NB, FB, SB, AB and DB)
TIPHON
Telecommunications and Internet Protocol Harmonisation over Networks; an ETSI project designed to support the market for voice communications and voice band communications. In particular TIPHON will ensure that users on IP-based networks can communicate with those on circuit switched networks
TMN
Telecommunications Management Network
TMSI
Temporary Mobile Subscriber Identity; covers the IMSI to prevent over-the-air interception and tracing
TRAU
Transcoder Rate Adapter Unit; the transport unit for a 16kbit/s traffic channel on the A-bis interface
Tri-band
Refers to a mobile phone able to operate on the three internationally designated GSM frequencies- 900, 1800 and 1900MHz
TrueSync
A technology which enables the optimal synchronisation of calendars, address books, action lists and memoranda. It enables multi-point, one-step synchronisation of wireless and wireline devices, desktop computers and server-based applications and services
TRX
Transmitter/receiver (transceiver)
The Consumer Mobile Glossary
Talk-time
The length of time a battery can power a mobile phone when making or receiving calls
