ITU-T - International Telecommunication Union/ITU Telcommunication Sector
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ITU-T X.691-2008
Scope
This Recommendation | International Standard specifies a set of Packed Encoding Rules that may be used to derive a transfer syntax for values of types defined in ITU-T Rec. X.680 | ISO/IEC 8824-1. These Packed Encoding Rules are also to be applied for decoding such a transfer syntax in order to identify the data values being transferred. The encoding rules specified in this Recommendation | International Standard: ?C are used at the time of communication; ?C are intended for use in circumstances where minimizing the size of the representation of values is the major concern in the choice of encoding rules; ?C allow the extension of an abstract syntax by addition of extra values@ preserving the encodings of the existing values@ for all forms of extension described in ITU-T Rec. X.680 | ISO/IEC 8824-1; ?C can be modified in accordance with the provisions of ITU-T Rec. X.695 | ISO/IEC 8825-6.
ITU-T X.691-2008 history
2008ITU-T X.691-2008 Information technology – ASN.1 encoding rules: Specification of Packed Encoding Rules (PER) (Study Group 17)