Abstract
Telecom packet timing networks based on the ITU-T G.8275.1 full timing support architecture typically use IEEE 1588 Precision Time Protocol (PTP) for time and phase distribution together with Synchronous Ethernet (SyncE) for frequency delivery, with upstream TimeTransmitter selection performed by the G.8275.1 alternate Best TimeTransmitter Clock Algorithm (A-BTCA). The existing A-BTCA prioritizes PTP dataset attributes such as clockClass, clockAccuracy, and variance, but does not consider the IEEE 1588 frequency traceability indication, even though frequency traceability can be critical in hybrid PTP+SyncE deployments. This disclosure identifies fault and holdover scenarios in which the current selection behavior can prefer a TimeTransmitter with a lower PTP clockClass but inferior or non-traceable frequency, while rejecting an alternate source that remains frequency-traceable through PRC-backed SyncE and provides superior stability. A frequency-traceability-aware selection approach is described in which the frequency traceable flag is evaluated prior to clockClass comparison during A-BTCA execution, with the existing G.8275.1 comparison sequence applied unchanged when candidates are equivalent in frequency traceability, thereby improving robustness and timing performance without altering the underlying PTP or SyncE standards.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Anonymous, "Frequency-Traceability-Aware TimeTransmitter Selection in G.8275.1 Full Timing Support Networks", Technical Disclosure Commons, (February 05, 2026)
https://www.tdcommons.org/dpubs_series/9278