- 産業: Telecommunications
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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 16-bit sequence in the last two octets of a frame (excluding flags) that offers a cyclic redundancy check (CRC. ) The CRC is derived over either the header in unnumbered-information-header format frames or over the entire packet frame for unnumbered-information frames (excluding flags. ) The algorithm used is described in ISO 3309.
Industry:Telecommunications
A 16-bit cyclic redundancy check (CRC) check sequence (CS) that is derived from bits from the first 8 octets (excluding flags) of a UIH format packet.
Industry:Telecommunications
A 10-digit number used for the purpose of routing an E911 call to the appropriate Public Service Answering Point (PSAP) when that call is originating from wireless equipment. The Emergency Services Routing Digit (ESRD) identifies the cell site and sector of the call origination in a wireless call scenario. The Emergency Services Routing Key (ESRK) uniquely identifies the call in a given cell site/sector and correlates data that is provided to a PSAP by different paths, such as the voice path and the Automatic Location Identification (ALI) data path. Both the ESRD and ESRK define a route to the proper PSAP. The ESRK alone, or the ESRD and/or Mobile Identification Number (MIN,) is signaled to the PSAP where it can be used to retrieve from the ALI database, the mobile caller's call-back number, position and the emergency service agencies (e.g., police, fire, medical, etc. ) associated with the caller's location. If a NANP TN is used as an ESRD or ESRK, this number cannot be assigned to a customer. See "Administrative Numbers" definition.
Industry:Telecommunications
A (data-encryption algorithm) key used to authenticate data in accordance with specific encryption standards.
Industry:Telecommunications
A "mark" that has the same polarity as the previous "mark" in the transmission of alternate mark inversion (AMI) signals. Note: In some transmission protocols, AMI violations are deliberately introduced to facilitate synchronization or to signal a special event.
Industry:Telecommunications
1. The physical medium on which information is stored in recoverable form. 2. In facsimile transmission, the physical medium on which the recorder forms an image of the object, i.e., creates the recorded copy. Note: The record medium and the record sheet may be identical. Synonym record sheet.
Industry:Telecommunications
A "logical" or "virtual" address used for routing Signaling System No. 7 (SS7) messages using signaling connection control part (SCCP) capabilities. To complete message routing, a GT must be translated to a SS7 point code and subsystem number.
Industry:Telecommunications
2. In digital television signal recording or transmission, the designator that identifies a certain coding algorithm having several levels and profiles, the most sophisticated of which are used for HDTV (high-definition television) applications. Note: M-PEG-2 video coding has been developed for use with satellite TV applications, including the required decoders ("set-top boxes". ) 3. The designator that identifies an international standard for compression of TV signals, which standard is used in conjunction with desktop computers for video presentations or clips. 4. Pertaining to files (with file-name extensions ". Mpg" or ". Mpeg") that are compressed using the MPEG standard. Also written MPEG.
Industry:Telecommunications
1: dBm is used in communication work as a measure of absolute power values. Zero dBm equals one milliwatt. Note 2: In DOD practice, unweighted measurement is normally understood, applicable to a certain bandwidth, which must be stated or implied. Note 3: In European practice, psophometric weighting may be implied, as indicated by context; equivalent to dBm0p, which is preferred.
Industry:Telecommunications
1. The process in which an IP (Internet protocol) datagram is broken into smaller pieces to fit the requirements of a given physical network; the reverse process of reassembly. 2. The physical separation of portions of a file on a computer disk.
Industry:Telecommunications
