ISO 20794-4:2020(E)
Foreword ..........................................................................................................................................................................................................................................v
Introduction ................................................................................................................................................................................................................................vi
1 Scope ................................................................................................................................................................................................................................. 1
2 Normative references ...................................................................................................................................................................................... 1
3 Termsanddefinitions ..................................................................................................................................................................................... 1
4 Symbols and abbreviated terms ........................................................................................................................................................... 2
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4.2 Abbreviated terms ............................................................................................................................................................................... 3
5 Conventions ............................................................................................................................................................................................................... 4
6 Introduction to data link layer and physical layer ............................................................................................................ 5
6.1 Frames ............................................................................................................................................................................................................ 5
6.2 Frame collision avoidance ............................................................................................................................................................. 5
6.3 Error detection and indication .................................................................................................................................................. 5
6.4 Clock transmission and detection .......................................................................................................................................... 5
7 Service interface parameters (SIP) ................................................................................................................................................... 5
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8 Data link layer (DLL) ........................................................................................................................................................................................ 8
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0016) ................................................................................................................................................................. 11
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8.5 DLL — Internal operation .......................................................................................................................................................... 19
8.6 DLL — Timing parameters ........................................................................................................................................................ 20
8.6.1 DLL — IBS timing handling ................................................................................................................................. 20
8.6.2 DLL — IFS timing handling .................................................................................................................................. 20
8.6.3 DLL — Beginning condition of frame .........................................................................................................21
8.6.4 DLL — Start of frame ................................................................................................................................................22
8.6.5 DLL — Frame transmission time .................................................................................................................... 22
8.7 DLL — Completion of frame .....................................................................................................................................................23
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© ISO 2020 – All rights reserved iii
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