- Industry: Telecommunications
- Number of terms: 29235
- Number of blossaries: 0
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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 local area network (LAN) or a metropolitan area network (MAN) using open systems interconnection (OSI) architecture, the portion of the physical layer that (a) interfaces with the medium access control sublayer, (b) performs character encoding, transmission, reception, and decoding, and (c) performs optional isolation functions.
Industry:Telecommunications
In a local area network, an ongoing activity of a data station to detect whether another station is transmitting.
Industry:Telecommunications
In a local area network, the interface between the medium access unit (MAU) and the data terminal equipment within a data station.
Industry:Telecommunications
In a local environment, terminals and equipment that provide immediate access from all terminals to a variety of telephone services without attendant assistance. Note: A KTS may interface with the public switched telephone network.
Industry:Telecommunications
In a local-area-network/metropolitan-area-network (LAN/MAN) system, the part of the link level that (a) supports medium-independent data link functions and (b) uses the services of the medium access control sublayer to provide services to the network layer.
Industry:Telecommunications
In a medium of constant refractive index, n, the product of the geometric distance and the refractive index. 2. In a medium of varying refractive index, the integral of ns, where s is an element of length along the path, and n is the local refractive index. Note: Optical path length is proportional to the phase shift that a lightwave undergoes along a path.
Industry:Telecommunications
In a message, a set of characters, usually in a prescribed format, used to express the day of the month, the hour of the day, the minute of the hour, the time zone, and the year. Note 1: The DTG is usually placed in the header of the message. Note 2: The DTG may be used as a message identifier if it is unique for each message. Note 3: The DTG may indicate either the date and time a message was dispatched by a transmitting station or the date and time it was handed into a transmission facility by a user or originator for dispatch.
Industry:Telecommunications
In a multichannel communications system, a repeater that has the necessary equipment for the local termination, i.e., the dropping, of one or more channels.
Industry:Telecommunications
In a multichannel communications system, signaling in which one channel in each link is used for signaling to control, account for, and manage traffic on all channels of the link. Note: The channel used for common-channel signaling does not carry user information. 2. A signaling method in which a single channel conveys, by means of labeled messages, signaling information relating to a multiplicity of circuits or calls and other information, such as that used for network management.
Industry:Telecommunications
In a multichannel transmission system, a process that diverts (drops) a portion of the multiplexed aggregate signal at an intermediate point, and introduces (inserts) a different signal for subsequent transmission in the same position, e.g., time slot or frequency band, previously occupied by the diverted signal. Note 1: Signals not of interest at the drop-and-insert point are not diverted. Note 2: The diverted signal may be demodulated or reinserted into another transmission system in the same or another time slot or frequency band. Note 3: The time slot or frequency band vacated by the diverted signal need not necessarily be re-occupied by another signal. Likewise, a previously unoccupied time slot or frequency band may be occupied by a signal inserted at the drop-and-insert point.
Industry:Telecommunications
