- 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 unit of measure for charging telephone calls, based on parameters such as the length of the call, the distance called, and/or the time of day. 2. Unit of measurement used for charging for measured message telephone exchange traffic within a specified area.
Industry:Telecommunications
A unit of measure of ratios of power levels, i.e., relative power levels. Note 1: The number of bels for a given ratio of power levels is calculated by taking the logarithm, to the base 10, of the ratio. Mathematically, the number of bels is calculated as B = log10 (P1/P2) where P1 and P2 are power levels. Note 2: The dB, equal to 0. 1 B, is a more commonly used unit.
Industry:Telecommunications
A unit of measurement expressed as either holding time or conversation time.
Industry:Telecommunications
A unit of measurement of the power of an audio-frequency signal, as measured by a vu meter. Note 1: The vu meter is built and used in accordance with American National Standard C16. 5-1942. Note 2: When using the vu meter to measure sine wave test tone power, 0 vu equals 0 dBm.
Industry:Telecommunications
A unit of modulation rate. Note: One baud corresponds to a rate of one unit interval per second, where the modulation rate is expressed as the reciprocal of the duration in seconds of the shortest unit interval. 2. A unit of signaling speed equal to the number of discrete signal conditions, variations, or events per second. Note 1: If the duration of the unit interval is 20 milliseconds, the signaling speed is 50 bauds. If the signal transmitted during each unit interval can take on any one of n discrete states, the bit rate is equal to the rate in bauds times log2n. The technique used to encode the allowable signal states may be any combination of amplitude, frequency, or phase modulation, but it cannot use a further time-division multiplexing technique to subdivide the unit intervals into multiple subintervals. In some signaling systems, non-information-carrying signals may be inserted to facilitate synchronization; e.g., in certain forms of binary modulation coding, there is a forced inversion of the signal state at the center of the bit interval. In these cases, the synchronization signals are included in the calculation of the rate in bauds but not in the computation of bit rate. Note 2: Baud is sometimes used as a synonym for bit-per-second. This usage is deprecated.
Industry:Telecommunications
A unit of plane angle measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle. Note: One radian is equal to 360°/2, which is approximately 57° 17' 44. 6".
Industry:Telecommunications
A unit of signaling speed used to express the number of characters passing a designated point per second.
Industry:Telecommunications
A unit of traffic measurement expressed as the number of connections established at a switching point per hour. 2. A unit of traffic measurement used to express the rate at which circuits are established at a switch. Note: The magnitude of the CCH is an instantaneous value subject to change as a function of time, i.e., from moment to moment.
Industry:Telecommunications
A unit of work consisting of an arbitrary number of individual operations all of which will either complete successfully or abort with no effect on the intended resources. A transaction has well defined boundaries. A transaction starts with a request from the application program and either completes successfully (commits) or has no effect (abort. )Both the commit and abort signify a transaction completion.
Industry:Telecommunications
A unit that supports transmission of signals over the air interface.
Industry:Telecommunications
