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7.20 T
T1 - a 1.54 Mbps network data link.
T3 - a 45 Mbps network data link. This can be done with parallel T1 lines and packet switching.
tap - a connection to a power line.
tare - the ratio between unloaded and loaded weights.
TCP (Transmission Control Protocol) - a transport layer protocol that ensures reliable data communication when using IP communications. The protocol is connection oriented, with full duplex streams.
tee - a tap into a larger line that does not add any special compensation, or conditioning. These connectors ofen have a T-shape.
telnet - a standard method for logging into remote computers and having access if connect by a dumb terminal.
temperature - the heat stored in an object. The relationship between temperature and energy content is specific to a material and is called the specific heat.
temperature dependence - as temperature varies, so do physical properties of materials. This makes many devices sensitive to temperatures.
thermal conductivity - the ability of a material to transfer heat energy.
thermal gradient - the change in temperature as we move through a material.
thermal lag - a delay between the time heat energy is applied and the time it arrives at the load.
thermistor - a resistance based temperature measurement device.
thermocouple - a device using joined metals that will generate a junction potential at different temperatures, used for temperature measurement.
thermopiles - a series of thermocouples in series.
thermoresistors - a category including RTDs and thermistors.
throughput - the speed that actual data is transmitted/processed, etc.
through beam - a beam is projected over an opening. If the beam is broken the sensor is activated.
thumbwheel - a mechanical switch with multiple positions that allow digits to be entered directly.
TIFF (Tagged Image File Format) - an image format best suited to scanned pictures, such as Fax transmissions.
time-division multiplex - a circuit is switched between different devices for communication.
time-proportional control - the amount of power delivered to an AC device is varied by changing the number of cycles delivered in a fixed period of time.
timer - a device that can be set to have events happen at predetermined times.
titration - a procedure for determining the strength of a solution using a reagent for detection. A chemical is added at a slow rate until the reagent detects a change.
toggle switch - a switch with a large lever used for easy reviews of switch settings, and easy grasping.
token - an indicator of control. Often when a process receives a token it can operate, when it is done it gives it up.
TOP (Technical Office Protocol) -
top-down design - a design is done by first laying out the most abstract functions, and then filling in more of the details as they are required.
topology - 1. The layout of a network. 2. a mathematical topic describing the connection of geometric entities. This is used for B-Rep models.
torque - a moment or twisting action about an axis.
toroidal core - a torus shaped magnetic core to increase magnetic conductivity.
TPDDI (Twisted Pair Distributed Data Interface) - counter rotating token ring network connected with twisted pair medium.
transceiver (transmitter receiver) - a device to electrically interface between the computer network card, and the physical network medium. Packet collision hardware is present in these devices.
transducer - a device that will convert energy from one form to another at proportional levels.
transformations - include translation, rotation, and scaling of objects mathematically using matrix algebra. Transformations are used to move objects around in a scene.
transformer - two separate coils wound about a common magnetic coil. Used for changing voltage, current and resistance levels.
transient - a system response that occurs because of a change. These effects dissipate quickly and we are left with a steady state response.
transmission path - a system component that is used for transmitting energy.
transport layer - an OSI network model layer.
TRIAC (TRIode Alternating Current) - a semiconductor switch suited to AC power.
true - a logic positive, high, or 1.
truth table - an exhaustive list of all possible logical input states, and the logical results.
TTL (Transistor Transistor Logic) - a high speed for of transistor logic.
turbine - a device that generates a rotational motion using gas or fluid pressure on fan blades or vanes.
turbulent flow - fluids moving past an object, or changing direction will start to flow unevenly. This will occur when the Reynold's number exceeds 4000.
twisted pair - a sheme where wires are twisted to reduce the effects of EMI so that they may be used at higher frequencies. This is cassualy used to refer to 10b2 ethernet.
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