- 産業: 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. In a communications system or network, the protection given to information to conceal it from unauthorized persons having access to the system or network at large. Synonym segregation. 2. In a communications system, protection given to unclassified information, such as radio transmissions of law enforcement personnel, that requires safeguarding from unauthorized persons. 3. In a communications system, the protection given to prevent unauthorized disclosure of the information in the system. Note 1: The required protection may be accomplished by various means, such as by communications security measures and by directives to operating personnel. Note 2: The limited protection given certain voice and data transmissions by commercial crypto equipment is sufficient to deter a casual listener, but cannot withstand a competent cryptanalytic attack. 4. The right of individuals to control or influence what information related to them may be collected and stored and by whom and to whom that information may be disclosed. NOTE - because this term relates to the right of individuals, ii cannot be very precise and its use should be avoided except as a motivation for requiring security.
Industry:Telecommunications
1. In a scanned image system, electrical compensation for the distortion introduced by the limiting size of a scanning aperture. 2. In television technology, restoration of the depth of modulation to the higher (i.e., higher Fourier) frequency components of the video signal, with the objective of achieving a subjective improvement in image quality. Note: Aperture correction is required to compensate for the properties of the camera lens, optical beam-splitting installation, and camera tube, all of which contribute to a reduced signal at higher spatial frequencies. Problems requiring aperture correction arise in a scanning system when the frequency response falls off as the effective wavelength of the detail to be resolved in the image approaches the dimension of the scanning aperture and becomes zero when that effective wavelength equals the dimension of the scanning aperture.
Industry:Telecommunications
1. In a public-key cryptosystem, that key of a user's key pair which is known only to that user. 2. A cryptographic key created and kept private by a party. Note: A private key may be used for the following: to compute the corresponding public key; to make a digital signature which may be verified by the corresponding public key; to decrypt the message encrypted by corresponding public key; or, together with other information, to compute a piece of common shared secret information. 3. Encryption methodology in which the encryptor and decryptor use the same key, which must be kept secret. 4. A key used in an asymmetric algorithm. Possession of this key is restricted, usually to only one entity. 5. The key, used in an asymmetric algorithm, that is known to only one entity.
Industry:Telecommunications
1. In a public switched telecommunications network, the ultimate user, i.e., customer, of a communications service. Note 1: Subscribers include individuals, activities, organizations, etc. Note 2: Subscribers use end instruments, such as telephones, modems, facsimile machines, computers, and remote terminals, that are connected to a central office. Note 3: Subscribers are usually subject to tariff. Note 4: Subscribers do not include communications systems operating personnel except for their personal terminals. 2. In cryptography, a party that has a keying relationship with a center or an entity that has a certificate from a certification authority.
Industry:Telecommunications
1. In a network, the ratio (1– x/y,) where: y is the number of cells that arrive in an interval at the ingress of the network; and x is the number of these y cells that leave at the egress of the network. 2. In a network element, the ratio (1– x/y,) where y is the umber of cells that arrive in an interval at the ingress of the network element; and x is the number of these y cells that leave at the egress of the network element.
Industry:Telecommunications
1. In a hybrid set, hybrid coil, or resistance hybrid, a circuit used to match, i.e., to balance, the impedance of a uniform transmission line, i.e., twisted metallic pair, over a selected range of frequencies. Note: A balancing network is required to ensure isolation between the two ports of the four-wire side of the hybrid. 2. A device used between a balanced device or line and an unbalanced device or line for the purpose of transforming from balanced to unbalanced or from unbalanced to balanced.
Industry:Telecommunications
1. In a digital video system, a sampling structure where the luminance and color-difference samples are generated from pixels arranged on one of two congruent rectilinear grids. Note: One grid is displaced horizontally from the other by half the horizontal pixel spacing. The alternate grid is usually chosen for alternate lines, but may also be chosen for alternate field/frames. 2. In a digital video system, a sampling structure with an array of samples where alternate rows of pixel samples are displaced horizontally in the grid by half of the pitch of the pixel samples along the remaining rows. Note: The name of this sampling was chosen directly from the classical Latin, quincunx, for the symbolic resemblance to the figure "5" (as seen in the "X" arrangement of pips on dice or playing cards. )
Industry:Telecommunications
1. In a data station, the equipment that (a) performs functions, such as signal conversion and coding, at the network end of the line between the data terminal equipment (DTE) and the line, and (b) may be a separate or an integral part of the DTE or of intermediate equipment. 2. The interfacing equipment that may be required to couple the data terminal equipment (DTE) into a transmission circuit or channel and from a transmission circuit or channel into the DTE. Synonyms data communications equipment (deprecated,) data set (deprecated. ) 3. Abbreviation for distributed computing environment. An architecture of standard programming interfaces, conventions, and server functionalities (e.g., naming, distributed file system, remote procedure call) for distributing applications transparently across networks of heterogeneous computers.
Industry:Telecommunications
1. In a data communication network, the station responsible for unbalanced control of a data link. Note: The primary station generates commands and interprets responses, and is responsible for initialization of data and control information interchange, organization and control of data flow, retransmission control, and all recovery functions at the link level. 2. A radio or television broadcast station whose signal is received by, and rebroadcast by, a translator station.
Industry:Telecommunications
1. In a computer program, a conditional jump or departure from the implicit or declared order in which instructions are being executed. 2. To select a branch, as in definition #1. 3. A direct path joining two nodes of a network or graph. 4. In a power distribution system, a circuit from a distribution device (power panel) of a lower power handling capability than that of the input circuits to the device.
Industry:Telecommunications
