68
Scenario 3: re-establishment of the primary source
>
Freerun on product start-up
>
Synchronisation with the primary source (e.g. GPS)
>
Loss of synchronisation from the primary source
>
>
(e.g. NTP)
>
Switch to the primary synchronisation source.
Scenario 4: synchronisation with the secondary source where no primary source is present
>
Freerun on product start-up
>
Timeout
1
for
synchronisation with the primary source (e.g. GPS)
>
Synchronisation with the secondary source (e.g. NTP)
Scenario 5: no synchronisation source
>
Freerun on product start-up
>
Timeout for
synchronisation with the primary source (e.g. GPS)
>
Timeout for synchronisation with the secondary source (e.g. NTP)
>
No synchronisation: switch to freerun
Change
of source
Synchronised
(primary)
Statuses:
Notifications:
Synchronised
Change
of source
Holdover
Freerun
Synchronised
(primary)
Synchronised
(secondary)
Holdover
1
The timeout duration depends on the synchronisation source:
>
Bodet GPS: 5 minutes
>
NTP: 15 minutes
Statuses:
Notifications:
Synchronised
Freerun
Time. 1
st
synchro.
Synchronised
(secondary)
Time. 2
nd
synchro.
Freerun
Statuses:
Notifications:
Loss of synchronisation then
switch to freerun
Freerun
Time. 1
st
synchro.
