Crittenden Connection Telecommunications Glossary: T

Index of Telecommunications related Terms and Definitions.

Tariff, TCP, TDD, Telco, Telecard, Telephone Company, Termination Gateway, Third Party Billing, Time of Day Routing, Toll, Toll Call, Toll Fraud, Touch Tone, Transmission Control Protocol, Trunk, Two Out Of Three Rule

Tariff
A public document filed with the FCC or a PUC ( Regulators ) that outlines telecommunications services and rates. Usually, all subscribers are offered the same rate for a specific telephone service, based on published constraints. See also: Contract Tariffs

TCP ( Transmission Control Protocol )
More reliable protocol for monitoring the control of data transmission -- because TCP checks data at the destination for confirmation that all packets are received. If any packets are missing, TCP resends them. See also: Packet Loss, UDP

TDD
Telecommunications Device for the Deaf.

Telco ( Telephone Company )
The local or regional telephone company that owns and operates telephone transmission lines to customer locations and Class 5 Central Office Switches. Telcos have connections to other COs, Tandem ( Class 4 Toll ) offices and may also connect directly ( See POP* )* to IECs like WorldCom, AT&T, MCI, Sprint, LDDS, etc. See also: Carrier, LEC

Telecard
Same as a phone card or calling card.
	Calling Cards / Phone Cards

Telephone Company ( Telco )
The local or regional telephone company that owns and operates telephone transmission lines to customer locations and Class 5 Central Office Switches. Telcos have connections to other COs, Tandem ( Class 4 Toll ) offices and may also connect directly ( See POP* )* to IECs like WorldCom, AT&T, MCI, Sprint, LDDS, etc. See also: Carrier, LEC

Termination Gateway
Specific computer equipment configured with certain hardware and software, which provides the electronic "bridge" from an IP network to the PSTN to connect to the destination telephone. See also: Gateway, Access Gateway, Switch, Router

Third Party Billing
Use of an outside service bureau for telephone bill processing such as: call rating, customer invoicing, collections, etc.

Time of Day Routing
Routing of telephone calls based on the time the phone call originates. (e.g. direct morning calls to East Coast operators and afternoon calls to West Coast operators, etc.). SMS/800 supports 15 minute time intervals.

Toll
A rated phone call (Contrast CDR - unrated phone call detail record). Tolls appear on the Invoice Detail.

Toll Call
A phone call with incremental use ( per / minute rounding ) charges. ( Often through a Class 4 Toll Office).

Toll Fraud
A crime in which a perpetrator obtains telecommunication services by: breaching computer security, using or selling stolen long-distance credit-card codes, or, accessing a PBX and using its communication facilities illegally. Toll Fraud is estimated to cost U.S. companies $1.6 billion/year.

Touch Tone
Also known as Dual Tone Multi Frequency ( DTMF )The system used by a touch-tone telephone whereas each of the 12 keys (10 numeric keys 0-9 and the symbol keys: # and * ) generate audible signals when pressed, each touch tone signal consisting of two separate tones ( Dual-Tones ). The twelve Dual-Tones of the twelve keys of a touch-tone key pad are made by from a combination of 7 individual tone / frequencies. A touch tone keypad is aligned in a grid with 4 rows and 3 columns. There is a tone for each of the 4 rows and a tone for each of the 3 columns. 4+3=7 ( 4 rows + 3columns = 7 Tones ) The Dual-tone generated by each key consists of the two tones that align to its row and column. 4X7=12 for 12 keys and 12 dual-tones. Each dual-tone is recognized & identified by the switch at the central office when routing the telephone call. See also: Dial, Outbound
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Transmission Control Protocol ( TCP )
More reliable protocol for monitoring the control of data transmission -- because TCP checks data at the destination for confirmation that all packets are received. If any packets are missing, TCP resends them. See also: Packet Loss, User Datagram Protocol

Trunk
Batches of cables / telephone lines grouped together going to the same destination.

Two Out Of Three Rule
When determining state tax jurisdiction, there are three locations to consider: originating station, destination station, and the location that the bill is sent to. If two out of three are within the same state, then that state receives the tax. See Also state tax

Tariff, TCP, TDD, Telco, Telecard, Telephone Company, Termination Gateway, Third Party Billing, Time of Day Routing, Toll, Toll Call, Toll Fraud, Transmission Control Protocol, Trunk, Two Out Of Three Rule

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