ANSI ISO IEC 8825-2-1998 pdf download Information technology ASN.1 encoding rules: Specification of Packed Encoding Rules (PER) AMENDMENT 1: Relative object identifiers
Definitions
For the purposes of this Recommendation International Standard, the following definitions apply.
31Basic Presentation Service definition
This Recommendation Intenational Standard makes use of the following terms defined in ITU-T Rec. X.216 ISO/IEC 8822:
a) defined context set;
b) presentation context identifier
Specification of Basic Notation3,2
For the purposes of this Recommendation International Standard, all the definitions in ITU-T Rec. X.680 ISO/IEC 8824-1 apply.
3,3Information Object Specification
For the purposes of this Recommendation International Standard, all the definitions in ITU-T Rec. X.681 ISO/IEC 8824-2 apply.
3.4Constraint Specification
This Recommendation International Standard makes use of the following terms defined in ITU-T Rec. X.682ISO/IEC 8824-3:
acomponent relation constraint:
Dtable constraint.
3.5 Parameterization of ASN.1 Specification
This Recommendation | International Standard makes use of the following terms defined in ITU-T Rec. X.683 ISO/IEC 8824-4:
variable constraint.
3.6
Basic Encoding Rules
This Recommendation | International Standard makes use of the following terms defined in ITU-T Rec. X.690 ISO/IEC 8825-1:
a) dynamic conformance;
b) static conformance;
c) data value;
d) encoding (of a data value);
e) sender;
f) receiver.
3.7 Additional definitions
For the purposes of this Recommendation | Intermational Standard, the fllowing definitions apply.
3.7.1 2’s-complement-binary-integer encoding: The encoding of a whole number into an octet-aligned-bit-field of a specified length, or into the minimum number of octets that will accommodate that whole number encoded as a 2’s- complement-integer, which provides representations for whole numbers that are equal to, greater than, or less than zero, as specified in 10.4.
NOTE 1 – The value of a two’s complement binary number is derived by numbering the bits in the contents octets, starting with bit 1 of the last octet as bit zero and ending the numbering with bit 8 of the first octet, Each bit is assigned a numerical value of 2N, where Nis its position in the above numbering sequence. The value of the two’s complement binary mumber is obtained by summing the numerical values assigned to each bit for those bits which are set to one, excluding bit 8 of the first octet, and then reducing this value by the numenical value assigned to bit 8 of the first octet if that bit is set to one.
NOTE 2- Whole mumber is a synonym for the mathematical term integer. It is used here to avoid confusion with the ASN.1 type integer.

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