- 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.
The geometric representation of colors in three-dimensional space. Note: There are three reference spaces recognized by ISO 8613: CMYK color space; CIELuv color space, and R,G,B color space.
Industry:Telecommunications
The generic designator for any of several digitally multiplexed telecommunications carrier systems. Note 1: The designators for T-carrier in the North American digital hierarchy correspond to the designators for the digital signal (DS) level hierarchy. See the associated table below. Note 2: T-carrier systems were originally designed to transmit digitized voice signals. Current applications also include digital data transmission. Note 3: If an "F" precedes the "T", a fiber optic cable system is indicated at the same rates. Note 4: The table below lists the designators and rates for current T-Carrier systems. Note 5: The North American and Japanese hierarchies are based on multiplexing 24 voice-frequency channels and multiples thereof, whereas the European hierarchy is based on multiplexing 30 voice-frequency channels and multiples thereof. See table below. T-Carrier Systems North American Japanese European (CEPT) Level zero (Channel data rate) 64 kb/s (DS0) 64 kb/s 64 kb/s First level 1. 544 Mb/s (DS1) (24 user channels) 1. 544Mb/s (24 user channels) 2. 048 Mb/s (30 user channels) (Intermediate level, North American Hierarchy only) 3. 152 Mb/s (DS1C) (48 Ch. ) - - Second level 6. 312 Mb/s (DS2) (96 Ch. ) 6. 312 Mb/s (96 Ch. ,) or 7. 786 Mb/s (120 Ch. ) 8. 448 Mb/s (120 Ch. ) Third level 44. 736 Mb/s (DS3) (672 Ch. ) 32. 064 Mb/s (480 Ch. ) 34. 368 Mb/s (480 Ch. ) Fourth level 274. 176 Mb/s (DS4) (4032 Ch. ) 97. 728 Mb/s (1440 Ch. ) 139. 268 Mb/s (1920 Ch. ) Fifth level 400. 352 Mb/s (5760 Ch. ) 565. 148 Mb/s (7680 Ch. ) 565. 148 Mb/s (7680 Ch. ) Note 1: The DS designations are used in connection with the North American hierarchy only. Note 2: There are other data rates in use, e.g., military systems that operate at six and eight times the DS1 rate. At least one manufacturer has a commercial system that operates at 90 Mb/s, twice the DS3 rate. New systems, which take advantage of the high data rates offered by optical communications links, are also deployed or are under development.
Industry:Telecommunications
The generation of many different wavelengths of light from a nominally single-wavelength source (a) by means of lasing action and interaction with molecules, thereby creating many different excited molecular energy levels that will produce photons of various energy levels, i.e., various wavelengths, when transitions to lower excited states occur and (b) by the beating together of two frequencies, thus inducing dipole moments in molecules at the difference frequencies and thereby causing modulation of laser-molecule interaction, which, in turn, produces light at side frequencies, i.e., side wavelengths relative to the nominal wavelength.
Industry:Telecommunications
The generating of signals by the interruption or modulation of a steady signal or carrier. 2. See chroma keying.
Industry:Telecommunications
The general class of pulse-code modulation in which the time of occurrence of some characteristic of the pulsed carrier is varied with respect to some characteristic of the modulating signal. Note: PTM includes pulse-position modulation and pulse-duration modulation.
Industry:Telecommunications
The general areas served by the local offices having direct trunks to or from the tandem office. This area may consist of one or more communities or may include only a portion of a relatively large city.
Industry:Telecommunications
The gain resulting from the insertion of a device in a transmission line, expressed as the ratio of the signal power delivered to that part of the line following the device to the signal power delivered to that same part before insertion. Note 1: If the resulting number is less than unity, an "insertion loss" is indicated. Note 2: Insertion gain is usually expressed in dB.
Industry:Telecommunications
The fundamental unit of information passed across any network utilizing Internet protocol. Note: An IP datagram contains source and destination addresses along with data and a number of fields that define such things as the length of the datagram, the header checksum, and flags that indicate whether the datagram can be (or has been) fragmented.
Industry:Telecommunications
The fundamental tariffed switching and transmission (and other) services that an operating company must provide to an enhanced service provider (ESP) to connect with its customers through the company network. 2. In an open-network-architecture context, the fundamental underlying connection of an enhanced service provider (ESP) to and through the operating company's network including an ESP access link, the features and functions associated with that access link at the central office serving the ESP and/or other offices, and the transport (dedicated or switched) within the network that completes the connection from the ESP to the central office serving its customers or to capabilities associated with the customer's complementary network services. Note: Each component may have a number of categories of network characteristics. Within these categories of network characteristics are alternatives from among which the customer must choose. Examples of BSA components are ESP access link, transport and/or usage.
Industry:Telecommunications
The fundamental law of quantum theory that describes the essential concept of the quanta of electromagnetic energy. Note 1: Planck's law states that the quantum of energy, E, associated with an electromagnetic field is given by E = h, where h is Planck's constant and is the frequency of the electromagnetic radiation. Note 2: Planck's constant is usually given in joule•seconds and the frequency in hertz. Thus, the quantum of energy is usually given in joules. Note 3: The product of energy and time is sometimes referred to as the elementary quantum of action. Hence, h is sometimes referred to as the elementary quantum of action.
Industry:Telecommunications
