- Industry: Telecommunications
- Number of terms: 29235
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ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the information, entertainment and communications industry.
The motion of waves through or along a medium. Note: For electromagnetic waves, propagation may occur in a vacuum as well as in material media.
Industry:Telecommunications
The monitoring of one or more communications lines, frequencies, or channels to obtain information by listening to or receiving all transmissions on them and transmitting and receiving messages as required.
Industry:Telecommunications
The modulation produced by introduction of the modulating wave into the plate circuit of any tube in which the carrier frequency wave is present.
Industry:Telecommunications
The modern form of the metric system, which has been adopted by the United States and most other nations. Note: The SI is constructed from seven base units for independent physical quantities. Tables showing these values are included below and are current as of Fall 1995. SI Prefixes. The common metric prefixes are: Multiplication Factor Prefix Name Prefix Symbol 1 000 000 000 000 000 000 000 000 = 1024 yotta Y 1 000 000 000 000 000 000 000 = 1021 zetta Z 1 000 000 000 000 000 000 = 1018 exa E 1 000 000 000 000 000 = 1015 peta P 1 000 000 000 000 = 1012 tera T 1 000 000 000 = 109 giga G 1 000 000 = 106 mega M 1 000 = 103 kilo k 100 = 102 hecto h 10 = 101 deka da 0. 1 = 10-1 deci d 0. 01 = 10-2 centi c 0. 001 = 10-3 milli m 0. 000 001 = 10-6 micro 0. 000 000 001 = 10-9 nano n 0. 000 000 000 001 = 10-12 pico p 0. 000 000 000 000 001 = 10-15 femto f 0. 000 000 000 000 000 001 = 10-18 atto a 0. 000 000 000 000 000 000 001 = 10-21 zepto z 0. 000 000 000 000 000 000 000 001 = 10-24 yocto y SI Base Units: Quantity Unit Name Unit Symbol length meter m mass kilogram kg time second s electric current ampere A thermodynamic temperature kelvin K amount of substance mole mol luminous intensity candela cd SI derived units. Derived units are formed by combining base units and other derived units according to the algebraic relations linking the corresponding quantities. The symbols for derived units are obtained by means of the mathematical signs for multiplication, division, and use of exponents. For example, the SI unit for velocity is the meter per second (m/s or m•s-1,) and that for angular velocity is the radian per second (rad/s or rad•s-1. ) Some derived SI units have been given special names and symbols, as listed in this table: Quantity Unit Name Unit Symbol Expression in Terms of Other SI Units Absorbed dose, specific energy imparted, kerma, absorbed dose index gray Gy J/kg Activity (of a radionuclide) becquerel Bq 1/s Celsius temperature degree Celsius C K Dose equivalent sievert Sv J/kg Electric capacitance farad F C/V Electric charge, quantity of electricity coulomb C A•s Electric conductance siemens S A/V Electric inductance henry H Wb/A Electric potential, potential difference, electromotive force volt V W/A Electric resistance ohm V/A Energy, work, quantity of heat joule J N•m Force newton N kg•m/s2 Frequency (of a periodic phenomenon) hertz Hz 1/s Illuminance lux lx lm/m2 Luminous flux lumen lm cd•sr Magnetic flux weber Wb V•s Magnetic flux density tesla T Wb/m2 Plane angle radian rad m/m Power, radiant flux watt W J/s Pressure, stress pascal Pa N/m2 Solid angle steradian sr m2/m2
Industry:Telecommunications
The mode of operation of the Presentation Layer, which provides the full facilities of the presentation service.
Industry:Telecommunications
The mode of ACSE (association control service element) operation that results in the transfer of ACSE semantics, using the presentation service.
Industry:Telecommunications
The mode in which messages for a signaling relation involving two adjacent signaling points are conveyed over a directly interconnecting signaling link.
Industry:Telecommunications
The mobile switching center (MSC) (switch) that obtains routing information (i.e., LRN. )
Industry:Telecommunications
The minimum value of the wanted-to-unwanted signal ratio, usually expressed in decibels, at the receiver input determined under specified conditions such that a specified reception quality of the wanted signal is achieved at the receiver output.
Industry:Telecommunications
The minimum value of average received power to achieve a 1 x 10–10 bit error ratio. It includes power penalties caused by use of a transmitter under standard operating conditions with worst-case values of extinction ratio, pulse rise and fall times, optical return loss, receiver connector degradations, and measurement tolerances.
Industry:Telecommunications
