- 産業: 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.
A mathematical statement that describes the transfer characteristics of a system, subsystem, or equipment. 2. The relationship between the input and the output of a system, subsystem, or equipment in terms of the transfer characteristics. Note 1: When the transfer function operates on the input, the output is obtained. Given any two of these three entities, the third can be obtained. Note 2: Examples of simple transfer functions are voltage gains, reflection coefficients, transmission coefficients, and efficiency ratios. An example of a complex transfer function is envelope delay distortion. Note 3: For a negative feedback circuit, the transfer function, T, is given by where eo is the output, ei is the input, G is the forward gain, and H is the backward gain, i.e., the fraction of the output that is fed back and combined with the input in a subtracter. 3. Of an optical fiber, the complex mathematical function that expresses the ratio of the variation, as a function of modulation frequency, of the instantaneous power of the optical signal at the output of the fiber, to the instantaneous power of the optical signal that is launched into the fiber. Note: The optical detectors used in communication applications are square-law devices. Their output current is proportional to the input optical power. Because electrical power is proportional to current, when the optical power input drops by one-half (3 dB,) the electrical power at the output of the detector drops by three-quarters (6 dB. )
Industry:Telecommunications
A mathematical statement, usually applied to frequency distributions of random variables, for the case in which two orthogonal variables are independent and normally distributed with unit variance.
Industry:Telecommunications
A mathematical value that is used (a) in an algorithm to generate cipher text from plain text or vice versa, and (b) to determine the operation of a cryptographic function (e.g., the synchronized generation of keying material,) or a digital signature computation or validation.
Industry:Telecommunications
A matrix associated with a network control protocol, which gives the hierarchy of link routing at each node.
Industry:Telecommunications
A matrix associated with a network control protocol, which gives the hierarchy of link routing at each node.
Industry:Telecommunications
A means by which a System Security Policy is enforced. Note: A general term, covering technical, procedural and management aspects of security.
Industry:Telecommunications
A means by which access to computer files is limited to authorized users only.
Industry:Telecommunications
A means for allowing programs or scripts (usually written in C++ or Perl) to add functionality to the World Wide Web. Note: Examples are search engines, feedback forms, and guestbooks. 2. Abbreviation for computer graphics interface.
Industry:Telecommunications
A means for an enhanced-service provider customer to connect to a network and to the enhanced service provider. Note: Complementary network services usually consist of the customer local service, such as a business or residence, and several associated service features, such as a call-forwarding service.
Industry:Telecommunications
A means for conveying information from one point to another in digital form. A digital channel may be implemented on a network composed of digital communications components.
Industry:Telecommunications
