| T1/DS-1 | (Facility) The equivalent of 24 multiplexed voice grade channels. 1.544 million bits per second (1.5Mbps) |
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| T2/DS-2 | (Facility) The equivalent of 4 multiplexed T1 channels. 6.312 million bits per second (6.3Mbps) |
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| T3/DS-3 | (Facility) The equivalent of 28 multiplexed T1 channels. 44.736 million bits per second (45Mbps) |
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| T4/DS-4 | (Facility) The equivalent of 6 multiplexed T3 channels. 274.176 million bits per second (274Mbps) |
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| Tariff | A public document filed with the FCC or a PUC that outlines services and rates. Usually, all customers are offered the same rate for a specific service, based on published constraints. |
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| TDD | - Telecommunications Device for the Deaf |
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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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| Third Party Billing | Use of an outside service bureau for bill processing such as: call rating, customer invoicing, collections, etc. |
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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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| Toll | A rated call (Contrast CDR - unrated call detail record). Tolls appear on the Invoice Detail. |
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| Toll Call | A call with incremental use (minute-by-minute) charges. (Often through a Class 4 Toll Office). |
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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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| 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 the same, then that state receives the tax. |
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