- 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 telephony, of a circuit, a signal indicating seizure, request for service, or a busy condition.
Industry:Telecommunications
In telephony, pertaining to the operation of a selector or other similar device to find and establish a connection with an idle circuit of a chosen group. 2. Pertaining to the failure of a device to achieve a state of equilibrium, usually by alternately overshooting and undershooting the point of equilibrium.
Industry:Telecommunications
In telephony, pertaining to the operation of a selector or other similar device to find and establish a connection with an idle circuit of a chosen group. 2. Pertaining to the failure of a device to achieve a state of equilibrium, usually by alternately overshooting and undershooting the point of equilibrium.
Industry:Telecommunications
In telephony, signaling in which dial pulses or supervisory signals are conveyed by a single voice-frequency tone in each direction. Note 1: An SF signaling unit converts E & M signaling to a format (characterized by the presence or absence of a single voice-frequency tone,) which is suitable for transmission over an ac path, e.g., a carrier system. The SF tone is present in the idle state and absent during the seized state. In the seized state, dial pulses are conveyed by bursts of SF tone, corresponding to the interruptions in dc continuity created by a rotary dial or other dc dialing mechanism. Note 2: The SF tone may occupy a small portion of the user data channel spectrum, e.g., 1600 Hz or 2600 Hz ("in-band" SF signaling,) usually with a notch filter at the precise SF frequency, to prevent the user from inadvertently disconnecting a call if user data has a sufficiently strong spectral content at the SF frequency. The SF tone may also be just outside the user voice band, e.g., 3600 Hz. Note 3: The Defense Data Network (DDN) transmits dc signaling pulses or supervisory signals, or both, over carrier channels or cable pairs on a 4-wire basis using a 2600-Hz signal tone. The conversion into tones, or vice versa, is done by SF signal units.
Industry:Telecommunications
In telephony, switching in which single transmission-path routing determination is accomplished in a switch by using a physically separated set of matrix contacts or cross-points.
Industry:Telecommunications
In telephony, the application of a signal to a line (a) to operate a line signal lamp or a supervisory signal lamp at a switchboard or (b) to ring a called receiver instrument.
Industry:Telecommunications
In telephony, the characteristic of interfaces that allows them to support transmission, switching, and signaling functions identical to those used in the enhanced services provided by the carrier. Note: As part of its comparably efficient interconnection (CEI) offering, the carrier must make available standardized hardware and software interfaces that are able to support transmission, switching, and signaling functions identical to those used in the enhanced services provided by the carrier.
Industry:Telecommunications
In telephony, the condition that exists when an operational telephone instrument or other user instrument is in use, i.e., during dialing or communicating. Note: Off-hook originally referred to the condition that prevailed when the separate earpiece, i.e., receiver, was removed from its switchhook, which extended from a vertical post that also supported the microphone, and which connected the instrument to the line when not depressed by the weight of the receiver. 2. One of two possible signaling states, such as tone or no tone and ground connection versus battery connection. Note: If off-hook pertains to one state, on-hook pertains to the other. 3. The active state, i.e., closed loop, of a subscriber or PBX user loop. 4. An operating state of a communications link in which data transmission is enabled either for (a) voice or data communications or (b) network signaling.
Industry:Telecommunications
In telephony, the condition that exists when an operational telephone, or other user instrument, is not in use. Note: On-hook originally referred to the storage of an idle telephone receiver, i.e., separate earpiece, on a hook that extended from a vertical post that supported the microphone also. The hook was mechanically connected to a switch that automatically disconnected the idle telephone from the network. 2. One of two possible signaling states, such as tone or no tone, or ground connection versus battery connection. Note: If on-hook pertains to one state, off-hook pertains to the other. 3. The idle state, i.e., open loop, of a subscriber or PBX user loop. 4. An operating state of a communications link in which data transmission is disabled and a high-impedance, i.e., open, circuit is presented to the link by the end instrument (s. ) Note: During the on-hook condition, the link is responsive to ringing signals. See on-hook state.
Industry:Telecommunications
