- Отрасли: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
- Company Profile:
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.
1. The wavelength or frequency at which a particular substance absorbs the most power (or, where the attenuation of the propagated signal is the greatest) whenever the substance is bombarded or irradiated with audio, electromagnetic, or light waves. Note: Whenever a material is thus bombarded, there is reflection, transmission through the material, and absorption within the material. In the case of air, O2 has multiple absorption peaks. See figure. 2. In optical communications media, the specific wavelength at which a particular impurity absorbs the most power, i.e., causes a maximum attenuation of propagated lightwaves. Note: Absorption by these impurities at other wavelengths is less than that of the absorption peak. Glass quartz silica, and plastics used in optical fibers, slab dielectric waveguides, optical integrated circuits (OICs,) and similar media, usually display absorption peaks. Impurities that cause absorption peaks include copper, iron, nickel, chromium, manganese, and hydroxyl ions.
Industry:Telecommunications
1. The use of telecommunication for automatically indicating or recording measurements at a distance from the measuring instrument. 2. The transmission of nonvoice signals for the purpose of automatically indicating or recording measurements at a distance from the measuring instrument.
Industry:Telecommunications
1. The ultimate user of a telecommunications service. 2. A person in contact with a Target of Evaluation who makes use only of its operational capacity.
Industry:Telecommunications
1. The type of computer on which a given operating system or application runs. Synonym hardware platform. 2. The operating system in use on a given computer. Synonym operating system platform. 3. The application program in use on a given computer and operating system. Synonym application platform. Note 1: The term platform, usually with some kind of accompanying qualifying verbiage, may also be applied to any combination of the foregoing. Note 2: The term cross-platform may be used to characterize an application program or operating system that may be run on more than one platform.
Industry:Telecommunications
1. The totality of protection mechanisms within a computer system , including hardware , firmware , and software , the combination of which is responsible for enforcing a security policy. Note: The ability of a trusted computing base to enforce correctly a unified security policy depends on the correctness of the mechanisms within the trusted computing base, the protection of those mechanisms to ensure their correctness, and the correct input of parameters related to the security policy. 2. The security protection mechanisms within a system's hardware, firmware and software which are responsible for enforcing the security policy. Note: In evaluation terms this means a region that contains no untrusted functions. 3. The totality of protection mechanisms within a computer system - including hardware, firmware and software - the combination of which is responsible for enforcing a security policy. A TCB consists of one or more components that together enforce a unified security policy over a product or system. The ability of a TCB to correctly enforce a security policy depends solely on the mechanisms within the TCB and on the correct input by the system administrative personnel of parameters (e.g., a user's clearance) related to the security policy.
Industry:Telecommunications
1. The totality of all of the Internet facilities—http, ftp, etc. —offered by an individual or an organization. 2. A Web location where Web pages are found. Synonym (in this sense) Web site. Note: A Web site describes only those resources available through the World Wide Web.
Industry:Telecommunications
1. The time required for a signal to travel from one point to another. 2. In cryptography, the delay between the presentation of a clear text block to a TDEA mode and the availability of the resulting encrypted text.
Industry:Telecommunications
1. The switching of primary utilities to their secondary backup whenever the primary source operates outside its design parameters. 2. In telephony, a function, which, when activated in the event of a commercial power failure or a low-voltage battery condition at a subscriber location, supplies power to predesigned subscriber equipment via the central office trunk. Note: Power-failure transfer is an emergency mode of operation in which one and only one instrument may be powered from each trunk line from the subscriber location to the central office.
Industry:Telecommunications
1. The software portion of a trusted computing base (TCB. ) 2. The software portion of a Trusted Computing Base.
Industry:Telecommunications
1. The SI unit of frequency, equal to one cycle per second. Note: A periodic phenomenon that has a period of one second has a frequency of one hertz. 2. A unit of frequency which is equivalent to one cycle per second.
Industry:Telecommunications
