IEEE 1588 v2

tomtuo

Foreword........................................................................................................................................................xi
IEEE introduction........................................................................................................................................ xiv
1. Overview ................................................................................................................................................... 1
1.1 Scope .................................................................................................................................................. 1
1.2 Purpose ............................................................................................................................................... 2
1.3 Layout of the document ....................................................................................................................... 2
2. Normative references................................................................................................................................. 3
3. Definitions, acronyms, and abbreviations .................................................................................................. 4
3.1 Definitions .......................................................................................................................................... 4
3.2 Acronyms and abbreviations ............................................................................................................... 7
4. Conventions............................................................................................................................................... 8
4.1 Descriptive lexical form syntax ........................................................................................................... 8
4.2 Word usage......................................................................................................................................... 9
4.3 Behavioral specification notation ...................................................................................................... 10
5. Data types and on-the-wire formats in a PTP system............................................................................... 11
5.1 General ............................................................................................................................................. 11
5.2 Primitive data type specifications ...................................................................................................... 11
5.3 Derived data type specifications........................................................................................................ 12
5.4 On-the-wire formats .......................................................................................................................... 15
6. Clock synchronization model ................................................................................................................... 16
6.1 General ............................................................................................................................................. 16
6.2 Principle assumptions about the network and implementation recommendations............................. 16
6.3 PTP systems...................................................................................................................................... 17
6.4 PTP message classes......................................................................................................................... 17
6.5 PTP device types ............................................................................................................................... 18
6.6 Synchronization overview ................................................................................................................. 29
6.7 PTP communications overview ......................................................................................................... 37
7. Characterization of PTP entities ............................................................................................................... 41
7.1 Domains............................................................................................................................................ 41
7.2 PTP timescale ................................................................................................................................... 41
7.3 PTP communications........................................................................................................................ 42
7.4 PTP communication media................................................................................................................ 46
7.5 PTP ports .......................................................................................................................................... 47
7.6 PTP device characterization .............................................................................................................. 53
7.7 PTP timing characterization .............................................................................................................. 61
8. PTP data sets ........................................................................................................................................... 63
8.1 General specifications for data set members ..................................................................................... 63
8.2 Data sets for ordinary and boundary clocks....................................................................................... 65
8.3 Data sets for transparent clocks ......................................................................................................... 74
9. PTP for ordinary and boundary clocks ..................................................................................................... 76
9.1 General protocol requirements for PTP ordinary and boundary clocks............................................. 76
9.2 State protocol.................................................................................................................................... 76
9.3 Best master clock algorithm .............................................................................................................. 83
9.4 Grandmaster clocks ........................................................................................................................... 92
9.5 Message processing semantics .......................................................................................................... 93
9.6 Changes in the local clock ............................................................................................................... 107
10. PTP for transparent clocks.................................................................................................................... 107
10.1 General requirements for both end-to-end and peer-to-peer transparent clocks ............................ 107
10.2 End-to-end transparent clock requirements ................................................................................... 108