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US 11,811,503 B2Granted
Method and apparatus for switching clock sources
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsYao Peng, Jun Wang, Daiying Liu
Life of this patent
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Abstract
A method for switching clock sources is provided. In the method, Precision Time Protocol, PTP, packets are monitored using each of PTP ports which connect to a new grandmaster (401). A frequency and a phase for the PTP port are calculated based on the PTP packets (402). In response to a successful check for the frequency and the phase, the PTP port is added to a candidate list (403). A phase calibration and a phase stability check may be introduced prior to the alternate BMCA.
Claims7
A method for switching clock sources, the method comprising:
- monitoring Precision Time Protocol (PTP) packets received via a first PTP port connected to a new grandmaster (GM);
- calculating a frequency and a phase for the first PTP port based on the received PTP packets;
- based on the calculated frequency and phase for the first PTP port, determining whether to add the first PTP port to a list of candidate ports;
- and
- selecting a slave port using the list of candidate ports.
2 more elements
Dependencies are inferred from the claim text.