- 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 short-term variation, with respect to time, of the frequency of an oscillator. Note: Frequency fluctuation, f (t,) is given by where (t) is the phase angle of the sinusoidal wave with respect to time, t.
Industry:Telecommunications
A signal consisting of a bit sequence that approximates a random signal. The unframed QRS (QRSS, QRTS, QRW) for DS1 consists of a PRBS with a 20-stage shift register with a constraint that forces the "put to a one" when the next 14 bits in the sequence would be zeros. The QRS generates every combination of 20-bit words, repeats every 1,048,575 bits, and contains high density sequences, low density sequences, and sequences that change from low density to high density and vice versa. When transmitted as the payload of a DS1 signal (framed,) the QRS meets the pulse density definition "a" criteria, providing a maximum of 15-sequential zeros (14 + 1 when the frame bit is a zero,) but does not meet the pulse density definition "b" criteria. (ANSI Tl. 403 states: 'the quasi-random signal may be transmitted without meeting these pulse density constraints. ') Contrast with pseudorandom number sequence.
Industry:Telecommunications
A signal consisting of horizontal sync pulses, vertical sync pulses, and equalizing pulses only.
Industry:Telecommunications
A signal from a network in response to an access request, indicating the network's readiness to accept address information.
Industry:Telecommunications
A signal from a receiver to a transmitter asking that a message be transmitted again.
Industry:Telecommunications
A signal generated by the momentary depression of the telephone switchhook or other device. Note: A flash may be used to request additional services. 2. An on-hook signal of a defined duration, used to activate network features.
Industry:Telecommunications
A signal in which an analog voltage or current, rather than a set of numbers, represents the value of a pixel. Synonym analog component.
Industry:Telecommunications
A signal in which discrete steps are used to represent information. Note 1: In a digital signal, the discrete steps may be further characterized by signal elements, such as significant conditions, significant instants, and transitions. Note 2: Digital signals contain m-ary significant conditions.
Industry:Telecommunications
A signal in which the network applies a high resistance between the tip and ring conductors at the network interface (NI. )
Industry:Telecommunications
A signal in which the time interval separating any two significant instants is equal to the unit interval or a multiple of the unit interval. Note 1: Variations in the time intervals are constrained within specified limits. Note 2: "Isochronous" is a characteristic, while "synchronous" indicates a relationship.
Industry:Telecommunications
