Defines the profile (options, parameters, extensions) for the use of PTP for packet-based time/phase delivery over a network of boundary or transparent clocks
Main use-case is time synchronization of TDD-based cellular basestations
Current version: 4th Edition, November 2022
Download from: http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=12815
Phase/Time Traceability Description | defaultDS.clockClass | Input SyncE QL | Frequency Traceable Flag | Time Traceable Flag |
---|---|---|---|---|
T-GM connected to a PRTC in locked mode (e.g. PRTC traceable to GNSS) | 6 | n/a | TRUE | TRUE |
T-GM in holdover, within holdover specification | 7 | PRC / PRS | TRUE | TRUE |
Non-PRC | FALSE | TRUE | ||
T-BC in holdover, within holdover specification | 135 | PRC / PRS | TRUE | TRUE |
Non-PRC | FALSE | TRUE | ||
T-GM in holdover, out of holdover specification | 140 | PRC / PRS | TRUE | FALSE |
150 | SSU-A / Stratum 2 | FALSE | FALSE | |
160 | SSU-B / Stratum 3E | FALSE | FALSE | |
T-BC in holdover, out of holdover specification | 165 | n/a | Depends on QL of input SyncE if available | FALSE |
T-GM or T-BC without time reference since start-up | 248 | n/a | ||
Slave only OC (does not send Announce messages) | 255 | n/a |
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