- Branche: 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 time slot that starts at a particular instant in a frame and is allocated to a channel for transmitting data, such as a character or an in-slot signal.
Industry:Telecommunications
A time standard that does not require calibration against another time standard. Note 1: Primary time standards are realized in practice as primary frequency standards, time and frequency being the mathematical inverses of one another. Examples of primary frequency standards are cesium standards and hydrogen masers. Note 2: By international agreement, the unit of time (the second) is defined in terms of the interval that transpires during a specified number of cycles (9,192,631,770 cycles) of the electromagnetic radiation associated with atomic resonance transitions between the two hyperfine ground-state levels of the cesium-133 atom in a magnetically neutral environment. Note 3: Realizable cesium frequency standards use a strong electromagnet to deliberately introduce a magnetic field of known strength, and which overwhelms that of the Earth. The presence of this strong magnetic field causes a slight, but known, increase in the atomic resonance frequency. Despite this precaution, minuscule frequency variations still exist among individual realizable cesium frequency standards. These variations are caused, among other factors, by slight variations in calibrating the currents in their respective electromagnets.
Industry:Telecommunications
A time standard that requires periodic calibration against a primary time standard.
Industry:Telecommunications
A time-division multiplexer that combines individual digital trunk groups into a higher rate bit stream for transmission over wideband digital communications links.
Industry:Telecommunications
A timer that specifies the period of time the network will wait for a release from the user after informing the user of a failure condition such as busy. This timer is on the order of 30 seconds.
Industry:Telecommunications
A toll office (as contrasted to a local office) in a toll center city.
Industry:Telecommunications
A toll service offering for customer dial type telecommunications between a given customer station and stations within specified geographic rate areas employing a single access line between the customer location and the serving central office. Each access line may be arranged for either outward (OUT-WATS) or inward (IN-WATS) service or both. Note: The offering is for fixed-rate inter- and intra-LATA services measured by zones and hours.
Industry:Telecommunications
A tone employed in a dial telephone system to indicate to the calling party that the equipment is ready to receive dial or tone pulses.
Industry:Telecommunications
A tone sent at a predetermined level and frequency through a transmission system for test purposes, such as for facilitating measurements and for aligning gains and losses in the system.
Industry:Telecommunications
A tone that comprises three precise sequential frequencies used to identify recorded announcements.
Industry:Telecommunications
