- 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 telephone systems, an electro-mechanical switching method whereby the selecting mechanism consists of a rotating element using several groups of wipers, brushes, and contacts.
Industry:Telecommunications
In telephone systems, multifrequency signaling in which standard set combinations of two specific voice band frequencies, one from a group of four low frequencies and the other from a group of four higher frequencies, are used. Synonyms multifrequency pulsing, multifrequency signaling. Note 1: DTMF signals, unlike dial pulses, can pass through the entire connection to the destination user, and therefore lend themselves to various schemes for remote control after access, i.e., after the connection is established. Note 2: Telephones using DTMF usually have 12 keys. Each key corresponds to a different pair of frequencies. Each pair of frequencies corresponds to one of the ten decimal digits, or to the symbol "#" or "*", the "*" being reserved for special purposes. Note 3: The standard signal frequency pairs transmitted by DTMF equipment used by the public exchange carriers are as follows: Button or Digit Frequencies (Hz) 1 697/1209 2 697/1336 3 697/1477 4 770/1209 5 770/1336 6 770/1477 7 852/1209 8 852/1336 9 852/1477 0 941/1336 * 941/1209 # 941/1477Note 4: Tactical telephones have 16 keys, the extra 4 being used for precedence. For DSN (Defense Switched Network) the signal frequency pairs transmitted for the ten decimal digits and the * and # are the same as those used by the public exchange carriers. The additional four keys, corresponding to four different frequency pairs and the precedence, are as follows: Button or Key Frequencies (Hz) FO (Flash Override) 697/1633 F (Flash) 770/1633 I (Immediate) 852/1633 P (Priority) 941/1633
Industry:Telecommunications
In telephone systems, the connection of a terminal facility so that it can be served by one or several switching centers. Note: Multiple homing may use a single directory number. 2. In telephone systems, the connection of a terminal facility to more than one switching center by separate access lines. Note: Separate directory numbers are applicable to each switching center accessed.
Industry:Telecommunications
In telephone systems, the extent to which circuits pick up noise and low-frequency energy by induction from power systems. Note: Susceptiveness depends on telephone circuit balance, wire and connection transpositions, wire spacing, and isolation from ground.
Industry:Telecommunications
In telephone systems, the use of signals and techniques to perform system management functions, such as system control, addressing, routing, error detection and correction, level control, priority, traffic control, message accountability, and other overhead functions that may be described in system overhead portions of messages.
Industry:Telecommunications
In telephone systems, treatment of a user's line or trunk that is in trouble, or in a permanent off-hook condition, by automatically disconnecting the line from the switching equipment. 2. In public telephone systems, a process that denies an attendant or other users the ability to reenter an established connection. 3. In a telephone circuit controlled by two voice-operated devices, the inability of one or both users to get through, either because of excessive local circuit noise or because of continuous speech from either or both users. 4. In mobile communications, an arrangement of control circuits whereby only one receiver can feed the system at a time. Synonym receiver lockout system. 5. An arrangement for restricting access to use of all, or part of, a computer system. Synonym protection.
Industry:Telecommunications
In telephone systems, treatment of a user's line or trunk that is in trouble, or in a permanent off-hook condition, by automatically disconnecting the line from the switching equipment. 2. In public telephone systems, a process that denies an attendant or other users the ability to reenter an established connection. 3. In a telephone circuit controlled by two voice-operated devices, the inability of one or both users to get through, either because of excessive local circuit noise or because of continuous speech from either or both users. 4. In mobile communications, an arrangement of control circuits whereby only one receiver can feed the system at a time. Synonym receiver lockout system. 5. An arrangement for restricting access to use of all, or part of, a computer system. Synonym protection.
Industry:Telecommunications
In telephone traffic engineering, a criterion that specifies the maximum number of calls or service demands that fail to receive immediate service. Note: The blocking criterion is usually expressed in probabilistic notation, such as P. 001.
Industry:Telecommunications
In telephone-service security, a link between the card and a terminal starting with the answer to reset (ATR) and ending with a subsequent reset or a deactivation of the card.
Industry:Telecommunications
In telephony, a basic digital multiplexing group. Note 1: In the North American and Japanese T-carrier digital hierarchies, each digroup supports 12 PCM voice channels or their equivalent in other services. The DS1 line rate (2 digroups plus overhead bits) is 1. 544 Mb/s, supporting 24 voice channels or their equivalent in other services. Note 2: In the European hierarchy, each digroup supports 15 PCM channels or their equivalent in other services. The DS1 line rate (2 digroups plus overhead bits) is 2. 048 Mb/s, supporting 30 voice channels or their equivalent in other services.
Industry:Telecommunications
