In
telecommunications and
computer networking, Abstract Syntax Notation One (ASN.1) is a
standard and flexible notation that describes
data structures for representing, encoding, transmitting, and decoding data. It provides a set of formal rules for describing the structure of objects that are independent of machine-specific encoding techniques and is a precise, formal notation that removes ambiguities.
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<
language,
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.
(2000-10-20)
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