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Jargon Buster
The du Pré Jargon Buster found the following for - TNos A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Term
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Explanation
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| T | The T-series Recommendations from the ITU-T regard terminal equipment and protocols for telematic services | |
| T reference point | An ISDN term. The interface between the PTO’s NT1 and the NT2 | |
| T1 | The USA standard term for an ISDN PRA circuit, carrying 23B + D with Q.931 signalling, with a total bandwidth of 1.544Mbit/s | |
| T2 Interface | The connection point for an PRA circuit | |
| TA | see Terminal Adaptor | |
| TAC | Telecommunication Advisory Committee. About 160 exist in the UK, and represent the interests of consumers in their respective regions | |
| Tail Adaptor | A Telephony slang term for an LJU Adaptor | |
| Talkdown Time | The period between a payphone demanding a coin and disconnecting the call if no coin is inserted. A BT term | |
| TAM | Telephone Answering Machine | |
| Tandem Working | Where three or more telephone system CCUs are linked by private wire connection, enabling direct dialling from one CCU to another via any of the others, transparently. For example, if three CCUs are connected in a row, a call from the first to the third will pass straight through the second as though it wasn’t there | |
| Tape Drive | A form of high capacity storage, typically used to back up HDs | |
| TAPI | Telephone Application Programming Interface. Backed by Microsoft | |
| TAPI 2 | Supports 3rd party call control in a Windows NT environment | |
| TBR | see Timed Break Recall | |
| TBR3 | BRA specification, set by ETSI | |
| TBR4 | PRA specification, set by ETSI | |
| Tc | A Frame Relay term. Committed Rate Measurement Interval (secs). The time interval during which the user can send only Bc-committed amount of data and Be excess amount of data. In general, the duration of Tc is proportional to the “burstiness” of the traffic. Tc is computed from the subscription parameters of CIR and Bc, as Tc = Bc/CIR. Tc is not a periodic time interval. Instead, it is used only to measure incoming data, during which it acts like a sliding window. Incoming data triggers the Tc interval, which continues until it completes its commuted duration | |
| TCD | A BT term. Target Completion Date. The date BT is expecting to provide service to a customer | |
| TCP/IP | Transmission Control Protocol / Internet Protocol. The name applied to a popular protocol suite developed by the Defence Advanced Research Projects Agency (DARPA). TCP is the transport layer in the suite and IP covers layer three. Now also used on many private networks | |
| TDD | Time Divisional Duplex - DECT protocol | |
| TDM | Time Division Multiplex. A method of mixing many signals into one by dividing the shared high-speed data stream into a sequence of time units | |
| TDMA | Time Divisional Multiple Access - DECT and cellular protocols. One of the oldest digital technologies, mostly seen in North America. It is considered the less advanced digital technology, partly because of its lack of flexibility compared to other digital cellular technologies | |
| TE | Terminal Equipment. A piece of equipment for connection to the ISDN | |
| TE1 | see Terminal Equipment | |
| TE1 | Terminal Equipment 1 - ISDN BRA compatible terminal. Does not need a TA | |
| TE2 | Terminal Equipment 2 - non-ISDN compatible terminal which therefore requires a Terminal Adaptor to allow connection to ISDN BRA | |
| TE2 | see Terminal Equipment | |
| TEC Annex | Type Examination Certificate Annex. This document replaced the PXML | |
| TEI | Terminal Endpoint Identifier. A unique number embedded in each TE, used to identify it on an ISDN line | |
| Telephone Number Portability | Export - Where a subscriber wants to cease PSTN or ISDN service with BT but retain the number and move to another PTO. Currently, this is restricted to certain geographical areas Import - Where a subscriber ceases PSTN service with another PTO, retains the number, and wants BT to provide the PSTN service. It is not a regulatory requirement and it is up to each Telephone Licensed Operator to decide whether they want to offer this service. Currently, BT is only able to import numbers from Nynex, and customers who have previously exported BT numbers and who now want to return to BT using the same numbers Inter Exchange Portability - Subscribers wanting to move out of their serving area and wanting to retain their existing numbers are provided via ‘Out of Area Exchange Lines’. These lines are available for ISDN and PSTN. However, availability must be checked with BT. Costs, which can become prohibitive especially for PRA, must first be confirmed with the client |
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| Tell Tail Adaptor | A Telephony slang term for an LJU Adaptor | |
| Telnet | An application program with an underlying TCP/IP protocol, providing terminal emulation for accessing remote computers, or remote devices, in dumb-terminal mode | |
| Terminal | In computing and telephony terms, a piece of equipment which performs a specific task. | |
| Terminal Adaptor | Allows a non-ISDN (i.e., PSTN) piece of equipment to be connected to the ISDN. The digital equivalent of a modem. For connecting non-ISDN devices to BRA | |
| Terminal Equipment | Any device connected to an So-bus or S1-bus is called Terminal Equipment, abbreviated to TE. If a TE is directly connected to the bus, it is designated as a TE1. If a number of TEs are connected to the same bus, all have the same designation of TE1. When a TE is not directly connected to a bus but to TE1, its designation is TE2 | |
| Terminal Portability | Allows a terminal to be unplugged from one socket and plugged into another without the call being cleared. A BT Digital Select Service identified by the MOU | |
| Terminal Server | A device generally used for connecting a number of asynchronous devices over the ISDN | |
| ThickNet | A form of Ethernet cabling capable of carrying data over longer distances than ThinNet. More expensive | |
| ThinNet | A form of Ethernet cabling capable of carrying data over shorter distances than ThickNet. Less expensive | |
| TIA | Telecommunications Industry Association. The national independent trade body | |
| Tie Line | see Private Circuit | |
| Timed Break Recall | i) Technical Basis for Regulation. Standards set by ETSI ii) Timed Break Recall. Places a 150msec interrupt on one of the two wires of an analogue telephone (POT) to instruct the telephone system to place the call on hold. One of two types of recall, the other being Earth Recall |
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| TimeLink | A BT term. Associted with BT's Advanced Features. The business 'never closes' - calls can be taken 24 hours per day calls routed differently according to the time of day. Resources can be tailored to meet call demand productivity is maximised. | |
| TJF | Test Jack Frame. Either integral within a telephone system or in a separate cabinet, forming the main connection point between the telephone system and its extensions TMA Telecommunication Managers Association. A national body designed to meet the needs of managers in private and public sector organisations responsible for telecommunications | |
| TO | Telecommunications Outlet | |
| Token Passing | A media access control method. In a token passing arrangement, the right to send data passes from one device to another in an ordered sequence determined by means of a token. A token is a special message which represents permission to send data | |
| Token Ring | A LAN technology specified in IEEE 802.5. A star topology method of cabling a computer network. Originally IBM’s answer to Ethernet. A system whereby a ‘token’ passes around the workstations in sequence allowing them each a chance to send or receive from the network | |
| Tone | see DTMF | |
| Topology | The manner in which a computer network or telephone system are linked or cabled | |
| Touch Tone | A BT Trade Mark for DTMF signalling | |
| TPM | Third Party Maintainer. Where a contract is with one company but any work is sub-contracted to a third party, or where the whole contract is passed to the third party in its entirely | |
| Transceiver | Hardware circuitry that provides the correct electrical/optical connection between computer and IEEE 802 LAN Media. Since transceivers typically support only one type of network media, a choice of transceivers is available to support network or different media. Transceivers can detect carrier and collisions and pass these signals up to the computer. Transceivers can be standalone units or incorporated into a circuit board within a computer. A shortening of Transceiver/Receiver, its full official title is Media Attachment Unit - MAU | |
| Transmission Medium | Any means of conveying a signal such as wires and cables, including less tangible media such as microwaves | |
| Transport Layer | Fourth layer of the OSI reference model. Supplies the upper layers with a Network Service which has improved quality of service features | |
| Tromboning | A telephony term to indicate the unnecessary double use of a private wire between two telephone systems. For example, extn 210 on telephone system 1 makes a call to extn 350 on telephone system 2 using one circuit of the private wire. Extn 350 decides to transfer the call to extn 235 on telephone system 1. This would use another circuit on the private wire, and is called tromboning. Some telephone systems have software which can recognise this, and release the private circuit from unnecessary use | |
| Trunk | The term given to a cable which join an exchange to another exchange, or a network to another network. Also the term given to a PSTN telephone line. Taken from the Middle Ages when water delivery, rather than being in pots or tanks, was made by pumping water along 8” (20cm) bored trunks of Elm with tapered ends for joining. Hence, “trunks” |
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| TSAPI | Telephone Services Application Programming Interface. Backed by Novell | |
| TSL | Telecommunications Services Licence. The full title is “Class licence to run branch systems to provide telecommunications services granted by the Secretary of State under section 7 of the Telecommunications Act 1984” | |
| TTED | The Telecommunications Terminal Equipment Directive. Came into force in 1992, but superceded by the R & TTED in April 2000 | |
| TUA | Telecommunications Users’ Association. An independent body which represents its members’ interests within the international arena | |
| Turret | An ACDtelephone system term. The name given to an extension which is designed to be used by an Agent in a Call Centre operation | |
| TXE4 | A part electro-mechanical and electronic telephone exchange. Not in service in the UK | |
| Type I, II, III | see PCMCIA slot |