Trunk. as in T-1. See T-1.
Tip. See Tip & Ring.
Tera, which is 10 raised to the 12th power, or 1,000,000,000,000, which has 12 zeros in the number.
An ADSL (Asymmetric Digital Subscriber Line)
Twisted pair. As in 10BaseT, an IEEE standard for Ethernet LANs, which run at 10Mbps (million bits per second), Baseband (single channel transmission), over Twisted pair (Category 3, 4, 5 or 6).
T stands for trunk, meaning that the T-Carrier technology was developed for the "trunk side," or carrier side, of the network. In carrier (telco) parlance, the "line side" of the network is the end user, or local loop, side. T Carrier is a generic
See T-1 below. Also see DS-, and Channel Bank.
T-shaped three-way conductor for distributing an incoming signal in two outgoing ways. Same shape as a T-connection in the road.
A T-shaped device with two
4-wire ISDN BRI circuit. Picture this: You order an ISDN circuit from your local phone company. They deliver it on a normal phone line ” one
24 voice channels
48 voice channels
96 voice channels
672 voice channels
4032 voice channels
24 voice channels
96 voice channels
480 voice channels
1440 voice channels
5760 voice channels
30 voice channels
120 voice channels
480 voice channels
1920 voice channels
7680 voice channels
30,720 voice channels
See T Interface.
A telephone term for a transmission medium through which a T-carrier system is operated. Also called a Span line. See T Carrier and T-1.
Also called a Span line. An outside plant four-wire, two twisted-pair transmission line. See T Carrier and T-1.
A passive line interface used for extracting data from a circuit. Also, for extracting optical signals from a fiber cable or electrical signals from a coaxial cable.
Test and Accept. After a circuit or system is installed, you should test it before you
Technology and Evaluation Lab.
Telephone and Telegraph. I found T+T engraved on a small metal closet in a hotel in Zurich, Switzerland. When I opened the closet, I found a crude telephone line crossconnect panel. The hotel ran its phone lines up a central shaft,
Also spelled T1, which stands for Trunk Level 1. A digital transmission link with a signaling speed of 1.544 Mbps (1,544,000 bits per second) in both directions (i.e. send and receive). T-1 is a standard for digital transmission in North America, ” the United States and Canada. T-1 is part of a progression of digital transmission pipes ” a hierarchy known generically as the DS (Digital Signal Level) hierarchy. (For the complete hierarchy, see the definition for T Carrier above.) In the olden days, T-1 was delivered to your business on two pairs of
On the other hand, an unchannelized approach is better for most data communications applications, and for compressed voice, video and IP telephony. The unchannelized approach provides you with 1.536 Mbps which you can split up any way you choose. If you lease a raw T-1 pipe, you could, for example, split it (i.e.,
In addition to use in network access applications, T-1 also can be used for private, leased line networking. In a private network, you might use channelized leased T-1 PBX tie trunks to "tie" together your voice PBXs. You might use unchannelized T-1 tie trunks to directly connect your local area network routers or data switches. Note that T-1 is medium-independent. You can run it over electrical (i.e., twisted pair or coaxial cable), optical (i.e., fiber optics or infrared) or radio (i.e., microwave or satellite) transmission media. Outside of the United States and Canada, DS-1 is called E-1, as it was developed by the CEPT (Conference of European Postal and Telecommunications Administrations) for use in Europe. E-1 runs at a total signaling rate of 2,048,000 bits per second. Only one element remains constant between it and the North American's T-1 ” the DS-0, namely the 64 Kbps channel. Most often it represents a PCM voice signal sampled at 8,000 times per second, or 64,000 bits per second. However, the form of PCM encoding, also known as companding,
T-1 Card A modern PBX is basically an empty metal cage with a backplane, power and empty slots into which you slide various cards. One of those cards is called a T-1 card. It's used for connecting the PBX to a T-1 line. Typically the T-1 card has a built-in CSU/DSU.
Trunk Level 1 Combined. The total signaling rate is 3.152 Mbps in North America and comprises two T-1s, which are interleaved to support 48 DS-0s at 1.544 Mbps each. The additional 64 Kbps is overhead used to support additional signaling and control requirements. T-1C is seldom used, outside of limited telco applications. See T-1.
See T-1 and BITS.
Digitization and coding of analog voice signals requires 8,000 samples per second (two times the highest voice frequency of 4,000 Hz) and its coding in 8-bit words yields the fundamental T-1 building block of 64 Kbps for voice. This is termed a Level 0 Signal and is represented by DS-0 (Digital Signal at Level 0). Combining 24 such voice channels into a serial bit stream using Time Division Multiplexing (TDM) is performed on a frame-by-frame basis. A frame is a sample of all 24 channels (24 x 8 = 192) plus a synchronization bit called a framing bit, which yields a block of 193 bits. Frames are transmitted at a rate of 8,000 per second (corresponding to the required sampling rate), thus creating a 1.544 Mbps (8,000 x 193 = 1.544 Mbps) transmission rate, the standard North American T-1 rate. This rate is termed DS-1. See also D-4 Framing and Extended Super-Frame Format. See also T Carrier, T2, T3 and T4.
The North American standard for DS-2 (Digital Signal Level 2). T-2 operates at a signaling rate of 6.312 Mbps, and is capable of handling 96 voice conversations, depending on the encoding scheme
The North American standard for DS-3 (Digital Signal Level 3). T-3 operates at a signaling rate of 44.736 Mbps, equivalent to 28 T-1s. T-3 is commonly referred to as 45 megabits per second. Capable of handling 672 voice conversations each at 64 Kbps, T-3 runs on fiber optic or microwave transmission, as twisted copper pair is not capable of supporting such a high signaling rate over distances of any significance. Running on fiber, it is typically called FT-3. Both Bill Gates and George Lucas allegedly have T-3 lines coming into their
The North American standard for DS-4. T-4 supports a signaling rate of 274.176 Mbps and is capable of handling 4,032 voice conversations. T-4 has 168 times the capacity of T-1. T-4 can run on coaxial cable, microwave radio or fiber optic transmission systems. T-4 generally is used only in carrier backbone networks, and generally is not available for end-user consumption. See also T-1.
also T-Berd. Colloquial term for a T-1 carrier analyzer, used by T-1 circuit technicians. Taken from the brand name of a leading device, T Berd 90A.
Either of the two external ports of a TDI or RDI which provides for transmitting or receiving eight TDM channels. Do not confuse with T-1 (as in T-one).
Terahertz ray; electromagnetic radiation produced at terahertz (trillion cycles per second) frequencies that, like an x-ray, can
An ADSL term for the functional interface between the ATU-R (Asymmetric Transmission Unit-Remote) and the PDN (Premises Distribution Network). The ATU-R may contain one or more T-SMs (Service Modules) for terminal adaption. The T-SM may be the same as the "T" interface where the PDN is a point-to-point, passive cable and wire system. The T-SM may be a separate physical device, or may be embedded in an integrated ATU-R/SM. See also ADSL, ATU-R, PDN, SM and T.
The most important transmission protocol standard for document conferencing (viewing, changing and moving files) over transmission media
ITU standard for generic T.120 Application Template.
Multipoint Communications Service for Audiographics and Audiovisual Conferencing - Service Definition. (ITU approved 1993.) See T.120 and T.125.
Protocol Stacks for Audiographics and Audiovisual Teleconference Applications. (ITU approved 1993/1994.) See T.120.
Generic Conference Control for Audiovisual Services (GCC) (ITU voted approval in 3/95.) T.125: Multipoint Communication Service - Protocol Specification (MCS). (ITU approved 1994.) See T.120 and T.122.
Multipoint Communication Service - Protocol Specification (MCS). (ITU approved 1994.) See T.120.
Provides shared whiteboard and document conferencing protocols. See T.120.
Provides multipoint binary file transfer. See T.120.
ITU standard for Audio Visual Control for Multipoint Multimedia Systems.
In early February, 1998, the ITU-T
ITU-T standard. Fax handshake protocol. This standard describes the overall procedure for establishing and managing communication between two fax machines. There are five phases of operation covered: call set up, pre message procedure (selecting the communication mode), message transmission (including
An ITU-T Recommendation for store-and-forward fax via e-mail through the incorporation of SMTP (Simple Mail Transfer Protocol) and MIME (Multipurpose Internet Mail Extension). SMTP is an
An ITU-T Recommendation for store-and-forward fax via e-mail. Derived from X.25 packet standards, T.38 addresses IP fax transmissions for IP-enabled fax devices and fax gateways, defining the translation of T.30 fax signals and Internet Fax Protocol (IFP) packets. The specific
ITU-T standard for
The concept is simple: use a fax machine equipped with a disk drive to send and receive binary files as easily as you send a fax. The system would benefit from the fax's technical sophistication and ease of use, such as calling tone and the called unit's identification of capabilities. T.434 is an evolving ITU-T recommendation which defines a format used to encode a binary file and its attributes into a set of octets. This encoded binary file can then by sent over phone lines using error-corrected T.30 fax pages. The union of these two elements (file format and T.30 ECM) is known as "Binary File Transfer." The T.434 file attribute encoding is independent of ECM's block and page segmentation. T.434 defines 27 attributes which are used to describe a file. These attributes include protocol version, filename, permitted actions, contents type, storage account, date and time of creation, date and time of last modification, date and time of last read access, identity of creator, identity of last modifier, identity of last readers, filesize, future filesize, access control, legal qualifications, private use, structure, application reference, machine, operating system, recipient, character set, compression, environment, pathname, user visible string and data file content. Fisk Communications of San Diego, CA has done extensive work in the area of T.434 and has granted an irrevocable
Microsoft also has defined a binary file transfer in the fax portion of its Microsoft At Work architecture. Some observers believe the At Work binary file transfer architecture is richer and more robust than T.434, supporting password and public/private-key encryption as well as digital signature verification. As of writing, it is not clear which standard will win.
T.568A Is a wiring scheme used for terminating four pair, all category 5e cable. There are three main choices when deciding which wiring scheme to use. The T.568A can accommodate two pair voice (2 pair USOC Voice Wiring)) and also 10Base-T networks, while the T.568B can only handle one pair voice. The other wiring scheme would be USOC wiring, used only when wiring for voice (Not recommended).
ITU-T recommendation for Group 3 fax machines using T.30 and various V series standards. It also describes compression methods (Modified Huffman and Modified READ).
Also known as Appli/Com. A messaging standard proposed by France and Germany defining a Programmable Communication Interface (PCI) for Group 3 fax, Group 4 fax, teletex and telex service.
Same as T1. Se T1.
The ANSI specification for ISDN BRI outside wire, known as the U interface. T1.601 uses the 2B1Q line code operating at 160 Kb/s (144 Kb/s of 2B+D plus Layer 1 overhead bits). The electrical signal can
A technical committee of the National Committee for Information Technology Standards , titled T11 I/O Interfaces. It is tasked with developing standards for moving data in and out of central computers.
See T-1 above (as in T-ONE).
A statistical multiplexer that divides the 1.544MbpsT1 bandwidth into 24 separate 64Kbps channels of digitized data or voice.
TSAT. A small satellite terminal used for digital communications that can handle T1 data rates of up to 1.544Mbps.
Voice channels, digitized and combined into a single digital stream. T1s are 1.544 Mbps. Y1 and E1 are similar in bandwidth and are used in Japan and Europe respectively.
ANSI's frame relay service specifications.
3.152 million bits per second. Capable of handling 48 voice conversations. T1C is further up the North American digital carrier hierarchy. See T CARRIER and T-1.
This is the specific technical subcommittee within CCITT responsible for ISDN standards.
An ANSI committee
An ANSI standards sub-committee dealing with Network Interfaces.
An ANSI standards sub-committee dealing with T-1 Inter-Network Operations, Administration and Maintenance.
An ANSI standards sub-committee dealing with performance.
T1S1 is a technical subcommittee to T-1 responsible for standards
T1X1 is a technical subcommittee to T-1 responsible for standards pertaining to synchronous interfaces and hierarchical structures relevant to interconnection of network transport signals.
6.312 million bits per second. Capable of handling at least 96 voice conversations depending on the encoding scheme chosen. T-2 is four times the capacity of T-1. T-2 is further up the North American digital carrier hierarchy. In this dictionary we have adopted the style of writing T2 as T-2. See T-1.
Twenty eight (28) T-1 lines or 44.736 million bits per second. Commonly referred to as 45 megabits per second. Capable of handling 672 voice conversations. T-3 typically runs on fiber optic and is then called FT3. T-3 is further up the North American digital carrier hierarchy. In this dictionary we have adopted the style of writing T3 as T-3. Some people believe that FT3 also means
Transaction Processing Protocol for Point of Sale. T3POS is a transaction switching and transport protocol designed to provide existing Point-Of-Sale (POS) equipment and future POS terminals with efficient and economical switching and transport service over an X.25 based packet network.
274.176 million bits per second. Capable of handling 4032 voice conversations. T-4 has 168 times the capacity of T-1. T-4 can run on coaxial cable,
Terminal Adapter. A Terminal Adapter allows existing non-ISDN terminals to
Technical Advisory. These
Technical Application Bulletin.
A collection of data in which each item is arranged in relation to the other items. Many telephony functions use "look up tables" to determine the routing of calls. These tables solve the problem, "If the call is going to this exchange in this area code, then use this trunk and this routing pattern." See Table Driven.
The major design tool of most web pages. Let's say you want to design a web page with two photos next to each other, separated by words talking about the photos. The only way to design this into a web page is to set it up with a table with three
Describing a logical computer process, widespread in the operation of communications devices and networks, in which a user-entered variable is matched against an array of pre defined values. Frequently used in network routing, access security and modem operation. It involves a table look up that is a reference to a collection of pre defined values.
An information retrieval system in which the input information and the related output information are stored as a pair. When a particular input is given, the table is accessed and the output data which coincides with the input is taken out.
A large one-room office that's filled with worktables but has no partitions. In short, it's a cube farm with the cubes, i.e. the cubicles.
Imagine the screen of your laptop being your portable PC. You'd have a screen larger than your PDA that would weigh less than your laptop. You'd touch icons or handwrite on the screen ” just like you do on your PDA. But you wouldn't have a builtin keyboard, though you might be able to plug one in. Personally I don't see the tablet PC's advantages, but then I don't carry either a PDA or a wireless pager.
AT&T's Telemetry Asynchronous Block Serial protocol. A polled point-to-point or multi point "
RS485 Point-to-Point or Multi-Point. Four wire, two Tx (remote to monitored) and two to Tx (monitored to remote), 22 or 21 gauge twisted pair, max 4 kft remote-to-monitored.
Test Access Controller.
Terminal Access Controller Access Control System. An IETF (RFC 1492) standard security protocol which runs between client devices on a network and against a TACACS server. TACACS is an authentication mechanism which is used to authenticate the identity of a device seeking remote access to a privileged database. Variations on the theme include TACACS+, which provides services of authentication, authorization and accounting independently. TACSAS+ supports a challenge/response system and password encryption, as well as the standard TACACS user authentication. See also Authentication.
Total Access Communications Systems. The original analog
Trend Analysis for Circuit Troubles.
TADSS. A transportable store-and-forward, message-switching system designed for rapid deployment in support of tactical forces. A military definition.
The equipment, communication, procedures, and personnel essential to a commander for planning, directing, coordinating, and controlling tactical operations of assigned forces pursuant to the missions assigned. A military definition.
A military term. A method or means of conveying information of any kind, especially orders and decisions from one command, person, or place to another within the tactical forces, normally by means of electronic equipment (including communications security equipment). Excluded from this definition are communications provided to tactical forces by DCS, to non tactical forces by DCS, to tactical forces by non tactical military commands, and to tactical forces by civil organizations.
A system configured by various types of
TADIL. A military term. A Joint-Chiefs-of- Staff-approved standardized communication link suitable for transmission of digital information. A TADIL is characterized by its standardized message formats and transmission characteristics.
TADIL ”A. A military term. A netted link in which one unit acts as a net control station and interrogates each unit by roll call. Once interrogated, that unit transmits its data to the net. This means that each unit receives all the information transmitted. This is a direct transfer of data and no relaying is involved.
TADIL ”B. A military term. A point-to-point data link between two units which provides for simultaneous transmission and
A military term. That part of the operational load required by the host service consisting of weapons, detection, command control systems, and related functions.
Telephone Answering Device.
Tactical Data Information Link.
Tactical Automatic Digital Switching System.
Targeted Accessibility Fund. In the late Spring of 1998, the New York State Public Service Commission ordered the establishment of a Targeted Accessibility Fund (TAF), which, according to the NYPSC, "will fund the costs incurred by all local exchange carriers, including competitive carriers, for E-911, lifeline and telecommunications relay service. All telecommunications carriers will be required to contribute to the fund based upon their
Trunk Answer From Any Station. The ability to answer an incoming phone call from any telephone attached to the system.
The Artist Formerly Known As Prince. In 1993, Prince Rogers Nelson, the rock artist known as "Prince" was engaged in a contract dispute with Warner-Chappel, his former record label. To spite them and thereby hopefully affect their sales of his records, he changed his name to an unpronounceable symbol. Therefore, he became known as "The Artist Formerly Known As Prince," i.e. TAFKAP. On December 31, 1999, his contract with Warner-Chappel formally
A field in a cache that contains information that allows determination whether a word in the cache corresponds to a
Tags are codes used for formatting HTML documents for the World Wide Web. There are both single and compound tags. For example, the single code for a line break is <br>. Bold text requires compound tags. For example, if you want to bold the word help, you would mark it <b>help</b>, where <b> means to
See RFID Tag.
TIFF provides a way of storing and exchanging digital image data. Aldus Corp., Microsoft Corp., and major scanner
A technique developed by Cisco Systems for high-performance packet forwarding through a router. A label or "tag" is assigned to destination networks or
ATM cells that have their CLP bit set to 1. If the network is
inTernational Atomic tIme. See International Atomic Time.
An echo cancellation term. The tail, measured in milliseconds, is the amount of your conversation which returns to you in the echo, as measured in milliseconds. A tail of zero
A feeder circuit or an access line to a network. Typically, a connection from a satellite, microwave receiver to a user's equipment location.
A point-to-point circuit connecting a remote terminal to a local terminal via two modems at an intermediate site. A crossover cable connects the two modems at the intermediate site.
A communications line from the end of a major transmission link, such as a microwave link, satellite link, or LAN, to the end-user location. A tail circuit is a part of a user-to-user connection.
TEHO. In a private network with several nodes (locations), TEHO occurs when a call placed from one location on the network to a location not on the network leaves the network at the node
See Employee Tailgating.
A new term for the old expression, to take charge. In this case, there's a project that needs to be done, let's say building a new factory. Someone has to be in charge. Someone has to "take ownership." In normal business, to take ownership usually involves being in charge of something smaller ” for example making sure that the hot dogs are delivered to the company picnic.
Tekelec Adaptation Layer Interface. Official Tekelec words: Tekelec developed the Transport Adapter Layer Interface (TALI) to fulfill an industrywide need for an open interface to ensure interoperability of convergence solutions from multiple vendors. In December 1999, Tekelec released the TALI interface source code to the telecommunications and Internet industries in an effort to promote an open network architecture for signaling over IP. With the support of Level 3, U S WEST Wireless, Lucent, Cisco, Orange PCS, and other carriers and equipment suppliers that are currently using the interface, Tekelec has submitted TALI to the Internet Engineering Task Force (IETF) for consideration as a standard.
A service on Internet whereby you hold conversations with others by typing into your computer. And they reply by typing into their computer.
The DC voltage supplied by the central office to the subscriber's loop so as to allow you to have a voice conversation. Also known as A BATTERY. Typically somewhere between 5 and 25
In voice processing, in response to questions such as "Press one for Harry," the user touchtones buttons on his phone. Those
You can imagine the havoc poor DTMF detection can cause a voice processing system. For example, if touchtoning three means "delete this message" and while playing the message, the system incorrectly detects a portion of the message playback as the touchtones for a key press three, I'll delete the message when I had intended to listen to it. On the other hand, if I'm listening to a message and want to delete it prior to finishing the message, I want the system to detect my key press three as the real thing and go ahead and delete the message.
The tip and ring conductors of a telephone circuit.
An instrument for talking over fibers ” used when installing and testing the cable.
The amount of time
The length of time you can talk on your portable or transportable cellular phone from a fully charged battery without standby time. The battery capacity of a cellular portable or transportable is usually
See Talk Off.
Missed signals in the presence of speech. Commonly used to describe the performance of a DTMF receiver when it fails to recognize a valid DTMF tone due to cancellation of that tone by speech.
Provides interaction with a Dialogic board, allowing for Voice Mail functionality.
DC current supplied from the central office to power the transmitter of the subscriber's telephone set. See Battery.
See Battery and Talk Battery.
TC. The network access line capacity of talking channel equipment of an entity is the maximum number of network access lines that can be
That part of the person seen in the typical business videoconference; the head and shoulders. This type of image is
See Talk Off.
Telephone Answering Machine.
Telecommunications Access Method.
Total Available Market. A cable TV word that refers to all the houses in the neighborhood of the cable.
In encrypted messaging, tamper detection allows the recipient of information to verify that it has not been modified in transit. Any attempt to modify data or substitute a false message for a
In a telecommunications context, the term refers to switches, circuits, or other Network Elements (NEs) that serve to allow other NEs to work together. For example, tandem switches, or tandem offices, serve to interconnect other, lesser switches, i.e., Central Offices (COs) or lesser tandems. Tandem switches, in the purest sense of the term, serve no end users directly, as that is the responsibility of the COs. Rather, they
A category of trunk groups that originates at EOs (End Offices) and terminates at tandems.
A physical network topology where connectivity between locations is achieved by linking several locations together in a chain using private line circuits. In a tandem architecture, a packet may have to pass through several intermediate locations before reaching its final destination. A single network failure can affect connectivity between several locations, a primary weakness of the topology.
In a communication system, an installation in which switching equipment connects trunks to trunks, but not any customer
A category of trunk groups that originates at tandems and terminates at EOs.
TC Trunk. A 1- or 2-way trunk between an end office switching system and an LATA tandem switching system.
A data channel passing through more than two data circuit-terminating equipment (DCE) devices in series. At the relay point, transmitted and received data, clock and other control signals must be transposed; if not accomplished in a switching system, a cable between the two must do so, often called a "rollover cable," or "null modem." See Null Modem Cable.
TIC Trunk. The trunk used for switched LATA access that interconnects an long distance company's Point of Presence (POP) with an local phone company's switching system. See Direct InterLATA Connecting Trunk Group.
A major phone company switching center for the switched telephone network. It serves to connect central offices when direct interoffice trunks are not available.
A main PBX is one which has a Directory Number (DN) and can connect PBX
An intermediate location in a tandem architecture.
A telephone company term. When for example: A shortage of receivers in a terminating office will be reflected in originating offices trunking traffic into the terminating switch. The obvious effect will be a
Tandem is a telephony term meaning to "connect in series." Thus a tandem switch connects one trunk to another. A tandem switch is an intermediate switch or connection between an originating telephone call location and the final destination of the call. The tandem point
Synonym of Tandem Tie Trunk Network.
TTTN. A serving arrangement that
The PBX permits tie lines to "tandem" through the switch. This means an incoming tie line call from a distant PBX receives a dial tone instead of automatically connecting with the operator. The caller can then dial a connection with either a phone on the PBX or an outgoing line. The outgoing line can be a local trunk in which case the distant PBX has access to a form of foreign exchange service, or another tie line which links a third system. This system of tie lines is widely used to form a corporate communications system, allowing economical connections between distant offices. To provide tie line tandeming ability, the PBX must be able to detect when either tie line goes on-hook at the distant end so that it can break its tandem connection and allow the tie lines to be used for other calls.
Trunks between an end office and a tandem switching machine or between tandem switching machines. Tandem trunks can provide direct routing or alternate routing capability when direct trunks are occupied.
A stock that is trading for less than the sum of its parts. Its value can be found (perhaps) by breaking it into juicy segments.
Traffic Analysis Data Management.
A voltage dielectric test in which the wire or cable test sample is submerged in water and voltage is applied between the conductor and water as ground.
There Ain't No Such Thing As A Free Lunch.
See Coltan and Tantalum Capacitor.
A Tantalum Capacitor is a device circuit switched equipment that processes voice calls from central offices. See Trunk Exchange.
The creative principle that orders the universe, according to Taoists, who follow the mystical Chinese philosophy founded by Lao-tzu (also spelled Lao-tse) in the 6th century B.C. Tao also is the path of
Telephony Application Object. Part of the SCSA programming framework. See S.100 and SCSA Telephony Application Objects Framework.
An electrical connection permitting signals to be transmitted onto or off a bus. The link between the bus and the drop cable that connects the workstation to the bus. Also a device used on CATV cables for matching impedance or connecting subscriber
Telocator Alphanumeric Protocol, also known as IXO. A 7-bit messaging protocol which allows someone sitting at a terminal or computer to send a one-way message to a pager (also known as a
A term in video compression referring to the number of pixels or lines
To draw energy from a circuit.
A button found on single line phones behind a PBX or Centrex. The tap button gives a precisely measured Hookswitch flash. The purpose of this button is to signal the PBX that it is about to receive a command ” typically a transfer. To transfer a call on a single line phone, you typically depress the hookswitch, then punch out the extension you want to transfer the call to, announce the call when someone answers, then hang up and the PBX or Centrex transfers the call. The problem with using a hookswitch to make this transfer is that if you depress the hookswitch for too long you will cut the call off. As a result, some manufacturers put a tap button on their single line phones. This button gives the precise hookswitch signal for the precise length of time necessary ” no more, no less. The Tap Button is also called a Flash button or a Tap Key.
Also called Tap Button or Flash Key. A button on a phone that accomplishes the same function as a switch hook but is not a switch hook. See Tap Button.
In a fiber optic coupler, the ratio of power at the tap port to the power at the input port.
In a coupler where the splitting ratio between output ports is not equal, the output port containing the lesser power.
Terminal Attachment Program Advisory Committee. Body which recommends telecom standards to the Canadian Federal Government.
Troubling news that
The physical unit that holds, reads and writes magnetic tape.
A device which reads information recorded on punched paper tape or magnetic tape.
A method of retransmitting TTY traffic from one channel to another, in which messages arriving on an incoming channel are recorded in the form of
Tapeout is a term used in the semiconductor business. When a processor or other silicon product is "taped out," all the various
An optical fiber in which the cross section, i.e., cross-sectional diameter or area, varies, i.e.,
Telephone Application Programming Interface. Also called Microsoft/Intel Telephony API. A term that refers to the Windows Telephony API. TAPI is a changing (i.e. improving) set of functions supported by Windows that allow Windows applications (Windows 3.xx, 95 and NT) to program telephone-
The following is Microsoft's explanation: The Microsoft Windows Telephony API (TAPI) 2.0 ships as part of Windows NT Server 4.0 and Windows NT Workstation 4.0. TAPI 2.0 is the latest release of the TAPI specification, introduced in 1993. TAPI helps bridge the gap between the telephone and computer. TAPI helps the PC to understand how telephone networks operate. With TAPI, programmers can exploit telephone network capabilities from within regular Windows-based applications. With TAPI, the
32-bit architecture. All core TAPI components are now based on the Win32 architecture. Non-Intel processors running Win NT Server 4.0 or Workstation 4.0 are supported.
32-bit application portability. Existing Win32 apps currently running on Win 95 using TAPI 1.4 will run on NT Workstation 4.0 or Server 4.0 on Intel x86 microprocessors.
16-bit application portability. Existing applications currently running on Win 95 and 3.1 using TAPI 1.3 will run on NT Workstation 4.0 or NT Server 4.0 on Intel x86 microprocessors.
Unicode support. Win32 apps can now call the existing ANSI TAPI functions or the new Unicode versions of functions. Unicode is a 16-bit, fixed-width character encoding standard. It encompasses virtually all of the characters commonly used on computers today.
Expanded feature support for call center applications.TAPI now supports an expanded set of features to better serve call center operations with Windows. New call center features supported include ACD queues, predictive dialing, and call routing.
Registry support. All telephony parameters are now stored in the Windows registry. All stored parameters can be updated across the LAN.
Quality of Service (QoS) support. Applications can request, negotiate, and re-negotiate QoS performance parameters with the network. Improved QoS support
Enhanced device sharing. Applications can restrict handling of inbound calls on a device to a single address. This supports features such as
Additions and changes to TAPI functions. Many new TAPI functions and messages are available with TAPI 2.0. In addition, several functions and messages already supported by TAPI 1.4 were changed in some measure to make them more consistent in their operation. See TAPI 3.0