1. Abstract Syntax Notation 1 standard, protocol> ASN. 1, X. 208, X. 680 An ISO/ITU-T standard for transmitting structured data on networks, originally defined in 1984 as part of CCITT X. 409 84. ASN. 1 moved to its own standard, X. 208, in 1998 due to wide applicability. The substantially revised 1995 version is covered by the X. 680 series. ASN. 1 defines the abstract syntax of information but does not restrict the way the information is encoded. Various ASN. 1 encoding rules provide the transfer syntax a concrete representation of the data values whose abstract syntax is described in ASN. 1. The standard ASN. 1 encoding rules include BER Basic Encoding Rules - X. 209, CER Canonical Encoding Rules, DER Distinguished Encoding Rules, and PER Packed Encoding Rules. ASN. 1 together with specific ASN. 1 encoding rules facilitates the exchange of structured data especially between application programs over networks by describing data structures in a way that is independent of machine architecture and implementation language. OSI Application layer protocols such as X. 400 MHS electronic mail, X. 500 directory services and SNMP use ASN. 1 to describe the PDUs they exchange. Documents describing the ASN. 1 notations: ITU-T Rec. X. 680, ISO 8824-1; ITU-T Rec. X. 681, ISO 8824-2; ITU-T Rec. X. 682, ISO 8824-3; ITU-T Rec. X. 683, ISO 8824-4 Documents describing the ASN. 1 encoding rules: ITU-T Rec. X. 690, ISO 8825-1; ITU-T Rec. X. 691, ISO 8825-2. [M. Sample et al, "Implementing Efficient Encoders and Decoders for Network Data Representations", IEEE Infocom 93 Proc, v. 3, pp. 1143-1153, Mar 1993. Available from Logica, UK]. See also snacc.
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