- 行业: 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.
A code in which "1s" are represented by a change in a significant condition and "0s" are represented by no change.
Industry:Telecommunications
A code in which "1s" are represented by one significant condition and "0s" are represented by another, with no neutral or rest condition, such as a zero amplitude in amplitude modulation (AM,) zero phase shift in phase-shift keying (PSK,) or mid-frequency in frequency-shift keying (FSK. ) Note: For a given data signaling rate, i.e., bit rate, the NRZ code requires only one-half the bandwidth required by the Manchester code.
Industry:Telecommunications
A code in which (a) data and clock signals are combined to form a single self-synchronizing data stream, (b) each encoded bit contains a transition at the midpoint of a bit period, (c) the direction of transition determines whether the bit is a "0" or a "1," and (d) the first half is the true bit value and the second half is the complement of the true bit value.
Industry:Telecommunications
A code in which each telegraph or data signal conforms to specific rules of construction so that departures from this construction in the received signal can generally be automatically detected and corrected. Note 1: If the number of errors is less than or equal to the maximum correctable threshold of the code, all errors will be corrected. Note 2: Error-correcting codes require more signal elements than are necessary to convey the basic information. Note 3: The two main classes of error-correcting codes are block codes and convolutional codes.
Industry:Telecommunications
A code in which each telegraph or data signal conforms to specific rules of construction, so that departures from this construction in the received signal can generally be detected automatically. Note: Error-detecting codes require more signal elements than are necessary to convey the basic information.
Industry:Telecommunications
A code in which eight consecutive zeros are replaced with the sequence 000+-0-+ if the preceding pulse was + and with the sequence 000-+0+- of the preceding pulse was -, where + represents a positive pulse, - represents a negative pulse, and 0 represents no pulse.
Industry:Telecommunications
A code in which some or all of the characters are represented by two sets of digits of opposite disparity that are used in sequence so as to minimize the total disparity of a longer sequence of digits. Note 1: An alternate mark inversion signal is an implementation of a paired disparity code. Note 2: The digits may be represented by disparate physical quantities, such as two different frequencies, phases, voltage levels, magnetic polarities, or electrical polarities, each one of the pair representing a 0 or a 1.
Industry:Telecommunications
A code in which the symbol stream formed by a portion of one code word, or by the overlapped portion of any two adjacent code words, is not a valid code word. Note 1: A self-synchronizing code permits the proper framing of transmitted code words provided that no uncorrected errors occur in the symbol stream. Note 2: External synchronization is not required. Note 3: High-level data link control (HDLC) and Advanced Data Communication Control Procedures (ADCCP) frames represent self-synchronizing code words.
Industry:Telecommunications
A code or block for which local routing information has been input to the LERG Routing Guide and the carrier has begun to activate and assign numbers within the NXX code or NXX-X block to end users (FCC 00-104, ¶240. )
Industry:Telecommunications
A code or password, unique to or associated with, a specific user, and entered into a data-processing device for purposes of verifying the identity of a person requesting, e.g., a transaction or access.
Industry:Telecommunications
