(Facility) The equivalent of 28 multiplexed T1 channels.
44.736 million bits per second (45Mbps)
T4 - DS-4
(Facility) The equivalent of 6 multiplexed T3 channels.
274.176 million bits per second (274Mbps)
TA - Technical Advisory
Published by Bellcore.
Table
(Relation) 2-dimensional information representation with Rows
& Columns.
Taligent
Apple Computer plus IBM joint development company to create
an Object-Oriented Operating System - upward compatible from
Macintosh System 7, IBM OS/2 & AIX. (Soon to be joined by HP.)
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.
Tax
A government levy based on the market price of products and
services that are sold.
Tax Exempt
Certificate
A document that verifies tax exempt status.
Tax
Identification Number
A unique identifier for business organizations that is used for
reporting tax payments to the government (similar to the social
security number for individuals).
TBD - To Be Determined
TCP/IP - Transmission
Control Protocol / Internet Protocol
A data communication standard for interconnection of dissimilar
networks and computing systems. Operates at the OSI transport and
session layers. (See Layers)
Updated by Jay Hennigan of the RAIN Network on 10/22/94
TDD - Telecommunications
Device for the Deaf
TDM - Time Division
Multiplexing
A method of mixing multiple signals on a single channel by
transmitting in tightly controlled time slots. Unlike packet
switching, TDM does not allow resource balancing during periods of
mixed high and low use of different signals.
Technician
A person familiar with installation and maintenance of systems.
Telco - Telephone Company
The local or regional telephone company that owns and operates
lines to customer locations and Class 5Central Office Switches.
Telcos have connections to other COs, Tandem (Class 4 Toll)
offices and may connect directly to IECs
like LDDS WorldCom, AT&T, MCI, Sprint, LDDS, etc.
Teleconference
Live, two-way audio transmission between two or more locations.
Usually includes speaker phones and microphone amplification
systems that allow audio volume balancing for people at different
locations from the microphone. May also be supported by the use of
FAX machines, etc. (See Video Conference)
An instrument or system used for voice communication. The
process or act of communicating via such a system.
Telnet
An application that provides virtual terminal services for a wide
variety of remote systems. It allows a user at one site to interact with
applications at other sites as if the user's terminal is local.
Template
(generic) A pattern (e.g. a cookie cutter) used to replicate
objects.
(C++) A facility for creating parameterized class (type)
definitions. (SMS/800)
A standard pattern defined by an IXC that
specifies the limits and boundaries (NPAs,
LATAs, etc.) of 800 routing.
Terminating
(Equipment) The equipment (multiplexer, channelizer, etc.)
required to provide a connection point for one circuit.
(Call 1) The destination of a switched call connection.
(Call 2) The process of ending a switched call connection and
the recording of the associated call details.
Test Plan
(SQA) A formal set of use case scenarios that describe normal
and abnormal dialogs that must be validated before new or modified
software may be released.
Theoretical Midpoint
(TMP)
The theoretical halfway point that divides an international
private line circuit into its respective US and foreign halves. A US
records carrier is responsible for the US portion of service and a
foreign records carrier assumes responsibility for service to the
foreign half.
Third Party
A product or service vendor (other than the primary vendor or
customer) that supplies a necessary component of a system. (e.g.
software, circuit cards, etc.)
Third Party Billing
Use of an outside service bureau for bill processing such as:
call rating, customer invoicing, collections, etc.
Throughput
The end result of data transmission (for a given period of time).
It is a measure of the overall efficiency, quality and performance
of a communications link and its software / protocols.
TIIAP
Telecommunications and Information Infrastructure Assistance
program: A grant program from the National Telecommunications and
Information Administration of the United States Department of Commerce,
established by Congress in fiscal year 1994 to assist non-profit
organizations and units of state and local government to undertake
projects which contribute to the building of a national information
infrastructure. Submitted by Don Druker, U.S Dept. of
Commerce -- Nov. 4, 1994.
Tick
3 seconds in a communications switch.
Tie Line
Two-way transmission circuits that typically directly connect a
PBX in one location to a PBX in one location to a PBX in
another. Tie lines are normally arranged for two-way calling. Calls
from an extension at one location can be placed to an extension at the
distant location by dialing a short access number. In most cases, this
type of circuit is terminated with a four-wire analog local loop on both
ends and uses MF signaling with E & M supervision. Tie lines can be
used to support voice and/or data.
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.
Token Ring
An IBM LAN-based LAN protocol that
uses a ring-shaped network topology. Token Ring has speeds of 4Mbps and
16Mbps. A distinguishing packet is transferred from machine to machine
and only the machine that is in control of the token is able to
transmit.
Toll
A rated call (Contrast CDR - unrated call detail record). Tolls
appear on the Invoice Detail.
Toll Call
A call with incremental use (minute-by-minute) charges.
(Often through a Class 4 Toll Office).
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.
A company that a potential customer does business with - used
during a credit check.
Traffic
Activity on a network or an individual circuit.
Traffic Engineering
The process or the organization responsible for monitoring
historical network use statistics, anticipating growth trends,
planning, designing and implementing network facilities.
Transaction
A single business event including the associated data and the
underlying processes and triggers.
Transfer
Move an entity from one object relationship to another (e.g.ANI, customer, receivables, etc.)
The foundation of communication capacity between two points.
It is governed by the equipment type generating the (optical)
signals. The capacity of a single fiber can be increased by
installing higher-speed (higher-cost) transmission systems
(end-to-end).
A telecommunication credit card with an
AuthCode for using a long distance carrier when the customer
is away from their home or office (ANI). Travel Service calls are charged to the customer to
whom the AuthCode was issued.
Trigger
(Generic) The activation of an event-driven process.
(Database) An application-specific process invoked by a
database management system as a result of a request to add, change,
delete, or retrieve a data element.
Trouble Ticket
A piece of paper or a record in a computer system used to
report and manage the resolution of network or circuit outages.
Trunk
A (high-capacity) connection between switches. From a
customer perspective, trunk may refer to an external (carrier) line
connected to CPE/PBX, including local exchange lines, WATS
lines and dedicated private
lines. Customer trunks may be outgoing only, incoming only or
two-way.
Trunk Group
A group of circuits of a common type that originate from the
same location.
Completing the installation of a circuit and making it available
to the customer that requested it.
Twelve O'clock
12:00 a.m. refers to midnight, 12:00 p.m. refers to noon.
Twisted Pair
A circuit comprised of two copper wires that are twisted to
cancel their own radio frequency interference, and thus reduce
noise that might otherwise be induced into adjacent circuits.
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.
Two-Way Conversation
A telephone conversation between or among two (or more)
parties, where each party has the ability to both transmit and
receive communication from the other party (or parties). (See Half Duplex, Full Duplex.
Contrast with Simplex - One Way)
