1 Scope
2 References
3 Terms and
definitions
4 Abbreviations
and acronyms
5 Synchronization
principles
5.1 Network
synchronization
5.2 Synchronization
distribution trails
5.3 Synchronization
interfaces
5.4 Clock-source
quality-level
5.5 Synchronization
status messages (SSMs), extended QL TLV, and timing marker (TM) channels
5.6 Selection
process
5.7 Signal
fail
5.8 Hold-off
time
5.9 Wait-to-restore
time
5.10 Synchronization
source priorities
5.11 External
commands
5.12 Automatic
reference selection process
5.13 Timing
loop prevention
5.14 Delay
times for NEs with SEC/ST3/SIC
5.15 Delay
times for NEs with SSU/ST2 or for SASE/BITS
5.16 Synchronization
layer functions
5.17 Overview
of the processes performed within the atomic functions
5.18 Interworking
between option I, II and III synchronization networks
6 Synchronization
distribution layer atomic functions
6.1 SD
connection function (SD_C)
6.2 SD
trail termination functions
6.3 SD
adaptation functions
7 Network
synchronization layer atomic functions
7.1 NS_connection
functions (NS_C)
8 Transport layer
to SD layer atomic functions
8.1 STM‑n
multiplex section adaptation functions
8.2 Pqs
adaptation functions
8.3 P12s
layer adaptation functions
8.4 T12
layer adaptation functions
8.5 P11s
layer adaptation functions
8.6 T01 layer
adaptation functions
8.7 T02 layer
adaptation functions
8.8 T21 layer
adaptation functions
8.9 ETH layer
adaptation functions
8.10 OTUk layer
adaptation functions
8.11 OSC layer
adaptation functions
8.12 FlexO layer
adaptation functions
8.13 FlexE layer adaptation functions
9 Equipment clock
to transport layers clock adaptation functions
9.1 STM-N
layer
9.2 VC
layers
9.3 Pxx layers
9.4 T12 layer
9.5 T01 layer
9.6 T02 layer
9.7 T21 layer
9.8 ETYn layer
9.9 ODU layer
9.10 OSC layer
9.11 FlexO layer
9.12 FlexE layer
10 T12 section
layer functions
10.1 T12 connection
function T12_C
10.2 T12 trail
termination functions
11 T01 section
layer functions
11.1 T01 connection
function T01_C
11.2 T01 trail termination
functions
12 T02 section
layer functions
12.1 T02 connection
function T02_C
12.2 T02 trail
termination functions
13 T21 section
layer functions
13.1 T21 connection
function T21_C
13.2 T21 trail termination functions
Annex A Synchronization selection process
Appendix I Transport layer models for synchronization
information
Appendix II Examples of synchronization functionality
in the NE
II.1 Examples
of synchronization functionality in the NE for option I networks
II.2 Examples
of synchronization functionality in the NE for option II networks
II.3 Examples
of synchronization functionality in the NE for option III networks
Appendix III Delay time allocation for option I
and III networks
III.1 Delay
and processing times for the synchronization selection process
III.2 Non‑switching
message delay TNSM
III.3 Switching
message delay TSM
III.4 Holdover
message delay THM
III.5 Wait-to-restore
time TWTR
Appendix IV Interworking of option II equipment
supporting second-generation SSM and first-generation SSM using a translation
function
Appendix V SDL descriptions
Appendix VI Clarification of the use of the acronym
'SEC'
Appendix VII Use cases of mixing SSM and eSSM