- 行业: 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.
In communications cables--including fiber-optic cables--having the transmission media wrapped helically around a central member, the longitudinal distance along the cable required for one complete helical wrap; i.e., the total cable length divided by the total number of wraps. Note 1: In many fiber-optic cable designs, the lay length is shorter than in metallic cables of similar diameter, to avoid overstressing the fibers during the pulling associated with the installation operation. Note 2: The wraps, i.e., turns, that are referred to should not be confused with the twists given twisted metallic pairs, i.e., wires, to reduce electromagnetic coupling. Pairs of optical fibers are not given such twists. Synonym pitch.
Industry:Telecommunications
In communications systems, a digital system in which (a) access is performed by T-1 hardware architecture in private and public networks with centralized switching and (b) cross-connection is performed by D3/D4 framing for switching digital-signal-0 (DS-0) channels to other DS-0 channels. Note: Modern digital access and cross-connect systems are not limited to the T-carrier system, and may accommodate high data rates such as those of SONET.
Industry:Telecommunications
In communications systems, a desired performance characteristic for communications circuits and equipment that is based on engineering analyses, but (a) is not considered feasible to mandate in a standard, or (b) has not been tested. Note 1: DOs are used because applicable systems standards are not in existence. Note 2: Examples of reasons for designating a performance characteristic as a DO rather than as a standard are (a) it may be bordering on an advancement in the state of the art, (b) the requirement may not have been fully confirmed by measurement or experience with operating circuits, and (c) it may not have been demonstrated that the requirement can be met considering other constraints, such as cost and size. Note 3: A DO is sometimes established in a standard for developmental consideration. A DO may also specify a performance characteristic that may be used in the preparation of specifications for development or procurement of new equipment or systems.
Industry:Telecommunications
In communications systems operations, the geographical path that is followed by a call or message over the circuits that are used in establishing a chain of connections. 2. To determine the path that a message or call is to take in a communications network. Note: In a Transmission Control Protocol/Internet Protocol (TCP/IP) internet, each IP datagram is routed separately. The route a datagram follows may include many gateways and many physical networks. 3. To construct the path that a call or message is to take in a communications network in going from one station to another or from a source user end instrument to a destination user end instrument.
Industry:Telecommunications
In communications systems operation, pertaining to a signal or event in the call-access phase of a data call, which signal or event confirms the reception of a call-request signal and advises the calling data terminal equipment to proceed with the transmission of the selection signals. Note: Examples of proceed-to-select pertain to a dial tone in a telephone system.
Industry:Telecommunications
In communications systems and network topologies, a route between any two points. 2. In radio communications, the route that (a) lies between a transmitter and a receiver and (b) may consist of two or more concatenated links. Note: Examples of paths are line-of-sight paths and ionospheric paths. 3. In a computer program, the logical sequence of instructions executed by a computer. 4. In database management systems, a series of physical or logical connections between records or segments, usually requiring the use of pointers.
Industry:Telecommunications
In communications system traffic flow control, channel allocation in which information-handling capacities of channels are not predetermined but are assigned on demand. Note: Adaptive channel allocation is usually accomplished by means of a multiplexing scheme.
Industry:Telecommunications
In communications system operations, the routing of messages based on the name of the destination office, the destination user, or the address on the message, i.e., the addressee.
Industry:Telecommunications
In communications security, the hardware, firmware, or software used to prevent access to specified data by unauthorized persons or systems, such as by preventing transmission, preventing forwarding messages over unprotected lines or circuits, or requiring special codes for access to read-only files. 2. An Information-system (IS) -trusted subsystem that enforces security policy on the data that passes through it.
Industry:Telecommunications
In communications security, see susceptibility. 2. The extent to which a system will degrade when subjected to a specified set of environmental conditions. 3. In communications interference, see susceptibility threshold. 4. In cryptology, the point of weakness within the encrypted system where threats can occur, such as equipment, facilities, hardware, software, operating systems and personnel. 5. A weakness in an information system (IS,) system security procedures, internal controls, or implementation that could be exploited.
Industry:Telecommunications
