PTP Notification States

Table 1. Overall Sync State

State	Definition
Locked	Overall PTP State is Locked	Indicates the following: all monitored services are Locked or Synchronized (excluding clockClass) a Secondary PTP source is present and the DU is syncing time from it. Note: In scenarios where a secondary PTP source is present, exclude GNSS-State from the overall sync state calculation.
Freerun	Overall PTP State is Freerun	Indicates that any of the PTP services are either in Freerun or non-Synchronized state.
Holdover	Overall PTP State is Holdover	Indicates that the Sync state is not locked, it transitions out of sync state, and the Holdover time does not expire.

Table 2. PTP Lock State

State	Definition
Freerun	Clock is out of sync state	Indicates the following: portState is not “SECONDARY”, the ClockClass value is NOT “6”, or the timeTraceable flag is FALSE holdover time exceeds its provided value ptp4l or phc2sys services are not running and are not accessible
Locked	Clock is in sync state	Indicates that portState is “Primary” or "Secondary", the ClockClass value is “6”, the timeTraceable flag is TRUE, and PMC, ptp4l configuration, ptp4l or phc2sys are accessible.
Holdover	Clock is in holdover state	Indicates that the holdover time does not expire.

Table 3. PTP Clock Class

Clock Class	Definition
6	Locked with Primary Reference Clock	Indicates that PMC, ptp4l configuration, ptp4l or phc2sys are accessible. Note: Determine the clockClass value using the PMC command. If the reading of the value fails, set the clockClass to 248.
7	PRC in holdover mode after losing synchronization
255	Slave Only Clock

Table 4. OS Clock State

State	Definition
Freerun	Clock is in Freerun state	Indicates that the Holdover conditions are met, but the holdover timer expired.
Locked	Clock is in Locked state	Indicates that Phc2sys is running and discipling the OS clock. Indicates that the OS clock is within 1000ns of the expected offset from PHC.
Holdover	Clock is in holdover state	Indicates the following: Holdover timer has not expired phc2sys is not running and not disciplining the OS clock OS clock offset is outside of tolerance values

Table 5. GNSS State

State	Definition
SYNCHRONIZED	Indicates the following: ts2phc is running and synchronizing NIC PHC NIC driver DPLL reports GNSS state is locked
ANTENNA-DISCONNECTED	Indicates the following: DPLL is in HOLDOVER state ts2phc is running and synchronizing NIC PHC
FAILURE-NOFIX	Indicates the following: ts2phc is not running and not synchronizing NIC PHC DPLLs are not in LOCKED state