Glossary - T


T1 Carrier

A T1 carrier exists as a time-division multiplexed and digital transmission facility that is capable of supporting upto 24 voice channels, each of which is encoded as a 64 kbps PCM DS0 signal. It produces an aggregate multiplexer output signal (which exists at the 1.544 Mbps DS1 rate). it developed in the 1960s. The T1 carrier was designed to operate fully in unshielded twisted pair (UTP) cable and duplex over two pairs.

Tandem Switching System

The tandem switching system is a broad and functional category that describes systems that connect from trunks to trunks, and also route traffic throughout a network.


A tariff is a published rate for a specificified telecommunications service, facility, or equipment. It constitutes a public contract that exists between the user and their telecommunications supplier (for example, the carrier). Tariff services and rates are often established by telecommunications carriers in a formal process during which carriers submit filings for the state or federal government regulatory review, possible ammendments, public comments, and approval.


Terminal adapter.


Transmission control protocol/internet protocol. TCP/IP exists as the Internet layer and transport layer, respectively, for the Internet suite of protocols. TCP relates to the layer 4 of OSI protocol stack and IP performs the functions of layer number 3. It's a connectionless protocol that is used primarily for the connection of dissimilar networks to each other.


Transmission control protocol.


Time division multiple access.


Time division multiplexing.


Telecommunications is any process which enables one or even more users to pass to one or even more other users any information of any nature that is then delivered in any usable form. This is done by either wire, visual, radio or other electrical, optical, electromagnetic, means. The word is a derivative of the Greek tele meaning "far off," and also the Latin communicare "to share."

Telecommunications Act

The Telecommunications Act 1984.

Telecommunications Network

A telecommunications network is designed to carry traffic from a variety of telecommunications services and works on a system of interconnected facilities. The network exists with two different but also related aspects. In terms of physical components, it exists as a facilities network. The variety of telecommunications services that is provided, supports a set of many traffic networks, each of which represents a particular entity of interconnection of facilities.

Telecommunications Service

Telecommunications service exists as a specific set of information transfer capabilities that provide a group of users a telecommunications system.

Telecommunications Users

Association (TUA) – this represents all of the categories of users from large businesses to residential.

Telephone Preference Service (TPS)

This is a service that was established by the Direct Marketing Association with the aim of helping to reduce the frequency of unwanted telemarketing calls that customer received. Customers had to contact their telephone company in order to join. Their details were then removed from the lists that many companies engaged in.

Terminating network

This is the network to which a customer who would receive a call is then directly connected.

Terrestrial Microwave Radio

Terrestrial microwave radio exists as a transmission systems that consists of at least two radio receivers/transmitter (transceivers) used to connect to high gain antennas (these are directional antennas that concentrate electromagnetic or alternatively radiowave energy, in to narrow beams) and focusese the pairs on each other. The operation exists point-to-point, which means, communications are established between the two and only the two antennas (installations) within line-of-sight visibility. This exists in contrast to point-to- multipoint systems like broadcast television or radio.

Test Jack Frame (TJF)

This is a frame that is supplied by the PABX supplier. It provides a connection point for an extension ports and exchange line to the BDF. It acts as the demarcation point between these.

Third Generation 3G

This is the next generation Cellular Radio created for mobile telephony. Ti came on to stream from 2001 onwards. 3G will exists as the first cellular radio technology that has been designed from the outset to support both wideband data communications just as effectively as it supports voice communications. Its aim is to be the basis for a wireless information society promoting access to information and also information services (e.g.electronic commerce) which is readily available at anytime or anyplace or anywhere or to anybody. 3G’s technical and regulatory frameworks are defined by the ITU and done so with its IMT-2000 programme International Mobile Telecommunications 2000. This is inclusive of the establishment of the open accessible standards and therefore the identification of an international allocated frequency spectrum.


Telecommunications Industry Association.


Technologies of Information and Communication.

Tied Service Provider (TSP)

These are service providers that are owned by or are in common ownership with a network operator’s Group.

Time Division Multiplexing (TDM)

Time Division Multiplexing exists as a transmission facility which is shared in time (as opposed to frequency). For example, the signals from several different sources share one single channel or a bus. This is done by using the bus or channel in successive time slots. It uses a discrete time slot or interval and assigns it to each signal source.

Time of day routing

This is the routing of calls to alternative destinations dependent on the day of the week or the time of day. It is dependent on the instructions held on the network that are relative to particular customers. One example could be an organisation that may wish to advertise one single telephone number but wants to have different incoming calls directed to alternative locations at different times. This form of routing requires the use of number translation service.


Telecoms Managers Association is the large business telecoms users’ organisation.


Transaction processing.


Tracking features approval levels that are user-defined and also project milestone tables in order to generate project status and cost information, that in turn is tracked for reporting and review. As assigned tasks are achevied, company supervisors must make daily entries that identify the number of hours a taks has been worked on, or materials that have been used, and also the number of work units that have been completed. The information is then made available for project jeopardy tracking/cost tracking and the determination of the contractor payments due.


Traffic is the flow of information that exists within a telecommunications network.


A transceiver is a generic used to describe a device that can be used to both transmit and receive. In the IEEE 802 local area network (LAN) standards, transceivers consists of transmitter, power converter, receiver and, for CSMA/CD LANs, it consists of collision detector and also jabber detector capabilities. Transmitters receive signals from attached terminal's network interface card (NIC). It then transmits them to the coaxial cable or another LAN medium. The receiver then receives signals from the medium and in turn transmits them accross the transceiver cable and Network Interface Card and on to the attached terminal. There is also a jabber detector that is a timer circuit which protects the LAN from being a continuously transmitting terminal.

Transfer Mode

Transfer mode is a generic term used for switching and multiplexing different aspects of digital networks and broadband integrated services (BISDN). It has been adopted by CCITT Study Group XVIII.

Transmission Facilities

Transmission facilities provide a communication path that carries user and also network control information between different nodes in a network. Therefore, In general, transmission facilities mainly consist of a medium (for example, free space, copper or fiber optic cable, or the atmosphere) and also electronic equipment that is located at points along the medium. to accomplish this, the equipment amplifies (analog systems) or it regenerates (digital systems) signals. It provides termination functions at different points where transmission facilities actually connect to switching systems. It may also provide the means to combine separate sets of call information and merge them into a single "multiplexed" signal which enhances the transmission efficiency.

Transmission Impairments

Transmission impairments is the degradation that is caused by practical limitations of a channel (for example; signal level loss that is due to attenuation or echo or various types of signal distortion) or it may be interference that is induced from outside the channel (for example power-line hum or maybe interference from heavy electrical machinery).

Transmission Medium

Transmission medium is a material substance or "free space" (e.g. a vacuum). It can be, or is, used for propagating suitable signals, which are usually in the form of electromagnetic (which is inclusive of light waves), or it may be acoustic waves. They are either unguided in the (which is the case of free space or something like a gaseous media) or they are guided by a boundary that is a material substance.

Transport Services

Transport Services support information transfer capabilities between the originating and terminating access service facilities. They are network switching transmission and related services.


A trunk is a communications path that connects two switching systems and is used to establish end-to-end connections inbetween customers.

Twisted Pair

This is the most common type of transmission medium. It consists of two insulated copper wires that are twisted together. These twists or lays are often varied in length in order to reduce the potential for interference. In cables that are greater than 25 pair, twisted pairs are grouped and then bound together in common cable sheath. Please see unshielded twisted pair.


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