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T1 |
| A high-speed digital line that can carry up to the equivalent of 24 telephone lines. It transfers digital signals at 1.544 megabits per second. T1 is synonymous with DS1. |
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T3 |
| A term for a system that transfers digital signals at 44.736 megabits per second. T3 is synonymous with DS3. |
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Tafi |
| (Trouble Administrations and Facilitation Interface) A system used by BST (Bell South Telecommunications) to process POTS trouble reports. |
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Talk Time |
| 1) The time that a wireless phone is on and transmitting or receiving a call. 2) The amount of time a wireless phone battery provides for transmitting and receiving calls. |
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Tandem Switch |
| A tandem switch connects one trunk to another |
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Tandem |
| The connection of networks or circuits in series. The connection of the output of one circuit to the input of another |
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Tariff Tables |
| Tables where rates are entered for air calls, local calls (interstate, interstate interlata, intrastate interlata, and overseas). |
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Tariff |
| A public document filed by a Carrier with the FCC or a Public Utility Commission that outlines services, fees, equipment and rates available to consumers for that carrier's service offerings. |
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Tdma |
| Time Division Multiple Access (TDMA) divides frequency bands available to the network into time slots, with each user having access to one time slot at regular intervals. TDMA thereby makes more efficient use of available bandwidth than the previous generation AMPS technology, and is available in either 800 or 1900 MHz frequencies |
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Telco - Telephone Company |
| The local or regional telephone company that owns and operates lines to customer locations and Class 5 Central Office Switches. Telcos have connections to other COs, Tandem (Class 4 Toll) offices and may connect directly to IECs like WorldCom, AT&T, MCI, Sprint, LDDS, etc. |
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Telecommunications Act Of 1996 |
| Legislation created to stimulate competition in telecommunication services, especially between wireless and wireline carriers. Among other things, the Act gave RBOCs the right to offer wireless long distance service to their local wireless customers. |
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Telecommunications |
| Any communication process that allows the transmission of information from a sender to a receiver by means of an electromagnetic or lightwave medium. |
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Telematics |
| The integration of wireless communications, vehicle monitoring systems and location devices. |
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Termination Charges |
| Fees that a phone company must pay to complete or terminate calls on another telecommunications company’s phone networks. For instance, wireless phone companies must pay to terminate a wireless phone call on another carrier’s wireless or landline network. |
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Third Party Billing |
| Use of an outside service bureau for bill processing such as: call rating, customer invoicing, collections, etc. |
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Third Party Verification |
| The use of an independent outside source to validate service order requests. |
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Three-Way Calling - |
| A cellular system feature that provides the ability to have a conference call from the cellular phone. The cellular user may connect with two other phone numbers for a three-way conversation. Also, a wireline feature |
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Tie Line |
| Ties switching equipment together at two locations via a dedicated line for the exclusive use of the customer. |
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Time Of Day Routing |
| Route calls based on the time the 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. |
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Time Sensitive |
| Cost of telephone service varies with certain times of day or week. For example, calls would cost during the day on Monday than on Sunday evening. |
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Toll Call |
| A call outside the local exchange service area whereby charges are incurred in specific billing increments. |
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Toll Fraud |
| A crime in which a "hacker" 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 $1.2 billion/year. |
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Toll Tandem Switch |
| A switch that relays a long distance call from the customer's local exchange central office to the long distance switch/POP |
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Toll-Free Service |
| This service uses area codes such as 800, 888 and 877. The receiving party sets up the service and incurs per-minute charges for the calls. |
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Tone: All Trunks Busy |
| Low tone interrupted twice per second which indicates that switching paths or equipments are busy. |
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Touch-Tone |
| Also called push-button dialing, it uses standard tone combinations to indicate numbers being entered. |
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Traffic |
| The amount of activity during a given period of time over a circuit, line or group of lines, or the number of messages handled by a communications switch. |
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Transmission |
| The sending and receiving of telecommunications messages through appropriate channels. |
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Triple Band |
| A network infrastructure or wireless phone designed to operate in three frequency bands. |
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Trs (Telecommunications Relay Service) |
| Special service for the hearing impaired, required of all local and long distance carriers providing voice transmission |
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Trunk Group |
| A group of essentially like trunks that go between the same two geographical points |
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Trunk(S) |
| Special central office switching line(s) which connect the subscriber's PBX to the CO switching equipment. |
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Twisted Pair |
| Two insulated copper wires twisted around each other to reduce induction (interference from one wire to another). |
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Two-Pic Exchange |
| An IntraLATA and InterLATA equal access area. It is possible to select two different carriers (one for intraLATA long distance and one for interLATA long distance) for each telephone number. |
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Two-Way Service |
| A line or trunk that is engineered to handle both incoming and outgoing calls. |
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Two-Wire Line |
| An electrically balanced circuit in which one wire is used to send and the other to receive. |
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