SAE J2369-2000 pdf download Standards for ATIS Message Sets Delivered over Reduced Bandwidth Media
3Definitions
3.1Auxiliary Data-The data found in auxiliary tables.
3.2Auxiliary Table-A type of table used to convey additional data not found in a primary table. Also called asecondary table. Typically, such tables are of the sparse type, but this is not a requirement.
3.3Bandwidth-Taken in the context of this document, the relative rate of information per unit time which can besent under a given set of environmental conditions. Bandwidth is relatively limited in most mobileenvironments and hence effort must be made to conserve its use if the channel is to be used to maximumbenefit to all parties. To the ATlS user, this means to be able to gain as much useful data as possible. To theoperator/owner of the channel.it means to be able to serve more clients and hence increase profits.
3.4 Bandwidth-Reduced Media-Aterm used in this documentt to refer to media in which the ability to senomessages and information is limited due to a variety of possible reasons. This document was developedoriginally for use with FM SubCarrriers. a bandwidth reduced environment where current state of the art limitssuccessful delivery of data to rates under 10 KBPS. n context of this document, the term BRM is used in thegeneral sense of all wireless applications (both one way and two way), as well as wire line applications such aslow data rate modems.
BER-Bit Error Rate3.5
3.6Context Token-A token used in a stream to establish the presence or absence of a specific condition. Atypical example is the use of the “maybe” condition whereby the context token state (one or zero in this casedetermines whether the next sequence of bits represents whatever object the “maybe” flag refers to.
3.7Context of a frame-A section in the beginning of each message frame where a number of specific dataelement formats are established and various default data values are set. This is the descriptive part of themessages in the context of a “self describing” message schema. The context is also referred to as the headerof the frame.
3.8Context Flags–A section of the message frame which contains data spanning over the header whichcontains a specified number of flags each having meaning regarding the ways in which the remainder of therame (the payload data) are to be interpreted. These flags establish the precise format of the messages in thepayload area and refer to the context tables for specific default entries as needed.
3.9Context Tables-A section of the frame header. whichcontains a sequence of values (entries), which areused to interrupt the data contained in the rerainder of the frame (the payload area). These values may bedefault interpretation of the data, or values regarding how to correctly connect this payload of data with priorpayload frames when the message (typically a table) extends over a single frame in length.
3.10 CRC_Cyclic Redundancy Code.A code determined trom a derived over all the subiect bits whichJOCeSSyields a unique value for the pattern of bits processed.CRC codesare used for several reasons in thisdocument, most often to characterize the values of the contents of a message with a unique code for ease insorting or processing. Because FEC Code is handled in the lower layers of the protocol, the CRC is typicallynot used for error correction. A CRC16 is used which produces a unique value for any sequence of bits up to2.16 in length.
3.11 Dynamic Association–The process of associating specific frames, modulations, and encoding methods withrelated sequences of data in the transmission coding. Dynamic association allows the encoder to dynamicallchange its allocation of bandwidth between various users and to relate the results of this process to receivingdevices. Related to this process but beyond the scope of this document is the concept of accounting andbilling of the final bandwidth allocation in the encoder.
SAE J2369-2000 pdf download
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