- Industry: 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.
In a facsimile transmitting apparatus, the scanning of the plane (developed in the case of a drum transmitter) of the message surface along lines running from right to left commencing at the top so that scanning commences at the top right-hand corner of the surface and finishes at the bottom left-hand corner; this is equivalent to scanning over a right-hand helix on a drum. Note 1: The orientation of the message on the scanning plane will depend upon its dimensions and is of no consequence. At the receiving apparatus, scanning takes place from right to left and top to bottom (in the above sense) for "positive" reception and from left to right and top to bottom (in the above sense) for "negative" reception. Note 2: This is the ITU-T Recommendation for phototelegraphic equipment.
Industry:Telecommunications
In a fiber optic communications link, a point at which an optical signal is passed from one equipment or medium to another without conversion to an electrical signal.
Industry:Telecommunications
In a fiber-optic communication link, the allocation of available optical power (launched into a given fiber by a given source) among various loss-producing mechanisms such as launch coupling loss, fiber attenuation, splice losses, and connector losses, in order to ensure that adequate signal strength (optical power) is available at the receiver. Note 1: The optical power budget is usually specified or expressed in dB. Note 2: The amount of optical power launched into a given fiber by a given transmitter depends on the nature of its active optical source (LED or laser diode) and the type of fiber, including such parameters as core diameter and numerical aperture. Manufacturers sometimes specify an optical power budget only for a fiber that is optimum for their equipment--or specify only that their equipment will operate over a given distance, without mentioning the fiber characteristics. The user must first ascertain, from the manufacturer or by testing, (a) the transmission losses for the type of fiber to be used, (b) the required signal strength for a given level of performance. Note 3: In addition to transmission loss, including those of any splices and connectors, allowance should be made for at least several dB of optical power margin losses, to compensate for component aging and to allow for future splices in the event of a severed cable.
Industry:Telecommunications
In a frame-relaying network, the condition when all frames relayed by the network satisfy the frame check sequence check.
Industry:Telecommunications
In a frequency modulation system, the ratio of the maximum frequency deviation of the carrier to the maximum modulating frequency of the system under specified conditions.
Industry:Telecommunications
In a frequency stabilized system, the sinusoidal component of a modulated wave whose frequency is independent of the modulating wave; or the output of a transmitter when the modulating wave is made zero; or a wave generated at a point in the transmitting system and subsequently modulated by the signal; or a wave generated locally at the receiving terminal which when combined with the side bands in a suitable detector, produces the modulating wave. Synonym common carrier.
Industry:Telecommunications
In a frequency-division multiplexed (FDM) transmission system, the absolute power level of the composite signal transmitted in one direction. Note 1: The absolute power level is referred to a zero transmission level point (0TLP. ) Note 2: The composite signal contains signaling, speech, and digital signals.
Industry:Telecommunications
In a gain medium, amplification of spontaneously emitted radiation characterized by moderate spectral line narrowing and moderate directionality. Note: Superradiance is usually distinguished from lasing action by the absence of positive feedback, and hence the absence of well-defined modes of oscillation.
Industry:Telecommunications
In a given communications system, a timing reference obtained from a source, such as a navigation system, external to the given system. Note: External timing references are usually referenced to Coordinated Universal Time.
Industry:Telecommunications
In a given trichromatic system, the amounts of the three reference color stimuli required to match the light considered in a given chromatic system.
Industry:Telecommunications
