- 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.
A digital signaling rate of 6. 312 Mb/s, corresponding to the North American and Japanese T2 designator.
Industry:Telecommunications
A digitally encoded card, similar to a credit card, usually containing a variety of information about the individual (s) authorized to use it. Note: The information can be accessed by a card reader into which the card is inserted. The information may include access codes (for opening doors,) account numbers (merchant account numbers as well as banking account numbers,) and electronic cash (which is withdrawn from the card as a purchase is made. )
Industry:Telecommunications
A dimensionless unit of the average traffic intensity (occupancy) of a facility during a period of time, usually a busy hour. Note 1: Erlangs, a number between 0 and 1, inclusive, is expressed as the ratio of (a) the time during which a facility is continuously or cumulatively occupied to (b) the time that the facility is available for occupancy. Note 2: Communications traffic, measured in erlangs for a period of time, and offered to a group of shared facilities, such as a trunk group, is equal to the average of the traffic intensity, in erlangs for the same period of time, of all individual sources, such as telephones, that share and are served exclusively by this group of facilities. Synonym traffic unit.
Industry:Telecommunications
A dimensionless unit of the average traffic intensity (occupancy) of a facility during a period of time, usually a busy hour. Note 1: Erlangs, a number between 0 and 1, inclusive, is expressed as the ratio of (a) the time during which a facility is continuously or cumulatively occupied to (b) the time that the facility is available for occupancy. Note 2: Communications traffic, measured in erlangs for a period of time, and offered to a group of shared facilities, such as a trunk group, is equal to the average of the traffic intensity, in erlangs for the same period of time, of all individual sources, such as telephones, that share and are served exclusively by this group of facilities. Synonym traffic unit.
Industry:Telecommunications
A dimensionless unit, expressed as a ratio, used to indicate the extent of coherence of an electromagnetic wave such as a lightwave. Note 1: For lightwaves, the magnitude of the degree of coherence is equal to the visibility, V, of the fringes of a two-beam interference test, as given by where Imax is the intensity at a maximum of the interference pattern, and Imin is the intensity at a minimum. Note 2: Light is considered to be highly coherent when the degree of coherence exceeds 0. 88, partially coherent for values less than 0. 88 but more than nearly zero values, and incoherent for nearly zero and zero values.
Industry:Telecommunications
A direct connection between the output of a transmitting device and the input of an associated receiving device. Note: When used for equipment measurements or testing purposes, such a back-to-back connection eliminates the effects of the transmission channel or medium. 2. A direct connection between the output of a receiving device and the input to a transmitting device. Note: The term "direct," as used in both definitions, may be construed as permitting a passive device such as a pad (attenuator) to accommodate power level constraints.
Industry:Telecommunications
A direct current (dc) that changes in value at regular or irregular intervals. Note: A pulsating direct current may change in value, i.e., be always present but at different levels, or it may be a current that is interrupted completely at regular or irregular intervals, but when present, is always in the same direction.
Industry:Telecommunications
A direct peer to peer communication of terminal equipment (TE) to TE, or TE to a network gateway supporting, for example, PSPDN interworking (public switched packet data network interworking. )
Industry:Telecommunications
A direct-current telegraph system employing polar transmission in one direction and a form of differential duplex transmission in the other. Note: Two types of polarential systems, known as types A and B, are in use. In half-duplex operation of a type A polarential system, the direct-current balance is independent of line resistance. In half-duplex operation of a type B polarential system, the direct current is substantially independent of the line leakage. Type A is better for cable loops where leakage is negligible but resistance varies with temperature. Type B is better for open wire where variable line leakage is frequent.
Industry:Telecommunications
A directional antenna producing a main beam having a large ratio of major to minor dimension at any transverse cross section.
Industry:Telecommunications
