ISO 11104:2011
Space data and information transfer systems — Time code formats
ISO 11104:2011 establishes a small number of standardized recommended time code formats for use in data interchange applications between agencies of the CCSDS. ISO 11104:2011 does not address timing performance issues such as stability, precision, accuracy, etc.
Time codes are digital representations of time information. ISO 11104:2011 describes four standard recommended time codes (one "unsegmented" and three "segmented" codes) which use the international standard second as the fundamental unit of time. An unsegmented time code is a pure binary count of time units and fractional time units from a starting time called the "epoch". A segmented time code is one in which the count of time units and fractional time units is accumulated in two or more cascaded counters which count modulo of various bases and start from the epoch.
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DOCUMENT CONTROL
1 INTRODUCTION
1.1 PURPOSE And Overview
1.2 SCOPE
1.3 CATEGORIZING OF CCSDS TIME CODE FORMATS
1.4 APPLICABILITY
1.5 BIT NUMBERING CONVENTION AND NOMENCLATURE
2 SECURITY
2.1 Security Background
2.2 Security concerns
2.3 Potential threats and attack scenarios
2.4 Consequences of not applying security
3 TIME CODE FORMATS
3.1 TIME CODE FIELDS
3.1.1 PREAMBLE FIELD (P-FIELD)
3.1.2 TIME FIELD (T-FIELD)
3.2 CCSDS UNSEGMENTED TIME CODE (CUC)
3.2.1 T-FIELD Description
3.2.2 P-FIELD Description
3.3 CCSDS DAY SEGMENTED TIME CODE (CDS)
3.3.1 T-FIELD
3.3.2 P-FIELD
3.4 CCSDS CALENDAR SEGMENTED TIME CODE (CCS)
3.4.1 T-FIELD
3.4.1.1 Month of Year/Day of Month Calendar Variation
3.4.1.2 Day of Year Calendar Variation
3.4.2 P-FIELD
3.5 CCSDS ASCII CALENDAR SEGMENTED TIME CODE (ASCII)
3.5.1 T-FIELD
3.5.1.1 ASCII TIME CODE A, Month/Day of Month Calendar Variation:
3.5.1.2 ASCII TIME CODE B, Year/Day of Year Calendar Variation:
3.5.1.3 SUBSETS OF THE COMPLETE TIME CODES:
3.5.2 P-FIELD
3.6 AGENCY-DEFINED CODES
3.6.1 T-FIELD
3.6.2 P-FIELD
ANNEX A RANGE OF SEGMENT COUNTERS FOR SEGMENTED TIME CODES (Normative)
ANNEX B RATIONALE FOR TIME CODES (Informative)
ANNEX C GLOSSARY OF SELECTED TIME TERMS (Informative)
ANNEX D CONVERSION BETWEEN TAI AND UTC (Informative)
ANNEX E EXAMPLE OF ACCOMMODATION OF AGENCY-DEFINED CODES (PB-5J) (Informative)
ANNEX F Informative References (Informative)
1 Scope
2 Requirements
3 Revision of publication CCSDS 301.0-B-4
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DOCUMENT CONTROL
1 INTRODUCTION
1.1 PURPOSE And Overview
1.2 SCOPE
1.3 CATEGORIZING OF CCSDS TIME CODE FORMATS
1.4 APPLICABILITY
1.5 BIT NUMBERING CONVENTION AND NOMENCLATURE
2 SECURITY
2.1 Security Background
2.2 Security concerns
2.3 Potential threats and attack scenarios
2.4 Consequences of not applying security
3 TIME CODE FORMATS
3.1 TIME CODE FIELDS
3.1.1 PREAMBLE FIELD (P-FIELD)
3.1.2 TIME FIELD (T-FIELD)
3.2 CCSDS UNSEGMENTED TIME CODE (CUC)
3.2.1 T-FIELD Description
3.2.2 P-FIELD Description
3.3 CCSDS DAY SEGMENTED TIME CODE (CDS)
3.3.1 T-FIELD
3.3.2 P-FIELD
3.4 CCSDS CALENDAR SEGMENTED TIME CODE (CCS)
3.4.1 T-FIELD
3.4.1.1 Month of Year/Day of Month Calendar Variation
3.4.1.2 Day of Year Calendar Variation
3.4.2 P-FIELD
3.5 CCSDS ASCII CALENDAR SEGMENTED TIME CODE (ASCII)
3.5.1 T-FIELD
3.5.1.1 ASCII TIME CODE A, Month/Day of Month Calendar Variation:
3.5.1.2 ASCII TIME CODE B, Year/Day of Year Calendar Variation:
3.5.1.3 SUBSETS OF THE COMPLETE TIME CODES:
3.5.2 P-FIELD
3.6 AGENCY-DEFINED CODES
3.6.1 T-FIELD
3.6.2 P-FIELD
ANNEX A RANGE OF SEGMENT COUNTERS FOR SEGMENTED TIME CODES (Normative)
ANNEX B RATIONALE FOR TIME CODES (Informative)
ANNEX C GLOSSARY OF SELECTED TIME TERMS (Informative)
ANNEX D CONVERSION BETWEEN TAI AND UTC (Informative)
ANNEX E EXAMPLE OF ACCOMMODATION OF AGENCY-DEFINED CODES (PB-5J) (Informative)
ANNEX F Informative References (Informative)
1 Scope
2 Requirements
3 Revision of publication CCSDS 301.0-B-4
Blank Page