CONTENTS
Page
Introduction ................................................................................................................................................................. v
1 Scope .............................................................................................................................................................. 1
2 Normative references ..................................................................................................................................... 1
2.1 Identical Recommendations | International Standards ........................................................................ 1
2.2 Paired Recommendations | International Standards equivalent in technical content........................... 1
2.3 Additional references .......................................................................................................................... 1
3 Definitions...................................................................................................................................................... 2
3.1 Specification of Basic Notation........................................................................................................... 2
3.2 Information Object Specification ........................................................................................................ 2
3.3 Constraint Specification ...................................................................................................................... 2
3.4 Parameterization of ASN.1 Specification ........................................................................................... 2
3.5 Basic Encoding Rules ......................................................................................................................... 2
3.6 Additional definitions.......................................................................................................................... 2
4 Abbreviations ................................................................................................................................................. 5
5 Notation.......................................................................................................................................................... 5
6 Convention ..................................................................................................................................................... 5
7 Encoding rules defined in this Recommendation | International Standard..................................................... 5
8 Conformance .................................................................................................................................................. 6
9 The approach to encoding used for PER ........................................................................................................ 6
9.1 Use of the type notation ...................................................................................................................... 6
9.2 Use of tags to provide a canonical order ............................................................................................. 7
9.3 PER-visible constraints ....................................................................................................................... 7
9.4 Type and value model used for encoding............................................................................................ 8
9.5 Structure of an encoding ..................................................................................................................... 8
9.6 Types to be encoded............................................................................................................................ 9
10 Encoding procedures ...................................................................................................................................... 10
10.1 Production of the complete encoding.................................................................................................. 10
10.2 Open type fields .................................................................................................................................. 10
10.3 Encoding as a non-negative-binary-integer......................................................................................... 10
10.4 Encoding as a 2’s-complement-binary-integer.................................................................................... 11
10.5 Encoding of a constrained whole number ........................................................................................... 11
10.6 Encoding of a normally small non-negative whole number................................................................ 12
10.7 Encoding of a semi-constrained whole number .................................................................................. 13
10.8 Encoding of an unconstrained whole number ..................................................................................... 13
10.9 General rules for encoding a length determinant ................................................................................ 13
11 Encoding the boolean type ............................................................................................................................. 16
12 Encoding the integer type............................................................................................................................... 16
13 Encoding the enumerated type ....................................................................................................................... 17
14 Encoding the real type.................................................................................................................................... 17
15 Encoding the bitstring type............................................................................................................................. 17
16 Encoding the octetstring type ......................................................................................................................... 18
17 Encoding the null type.................................................................................................................................... 19
18 Encoding the sequence type ........................................................................................................................... 19
19 Encoding the sequence-of type....................................................................................................................... 20
20 Encoding the set type ..................................................................................................................................... 20
21 Encoding the set-of type................................................................................................................................. 21
ITU-T Rec. X.691 (07/2002) iii
22 Encoding the choice type................................................................................................................................ 21
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