Safran SecureSync 2400 User Manual page 529

Configuration — PTP-Specific Steps
Confirm that:
The PTP Port Activity is enabled (check the
page under the
the PTP Setup/Network
The clock is set to be a Master-Only clock (check the
PTP Setup/Clock
A valid IP address is currently being used (check the
the PTP Setup/Network
When the PTP Module is set to be a Master Clock, the module will immediately
attempt to become the active Master Clock on the network (PTP Port State =
Master). If it does, it will start to transmit PTP packets (even if SecureSync is not
yet synchronized).
There are several reasons why the PTP Module may not become the active
Master Clock, or may not be broadcasting the correct time, even if it is set to be a
Master Clock:
a. If using any reference other than self for 1PPS, SecureSync will not become
an active Master Clock until the
system is less than 15. After first going into sync after power-up, it may take
a minute or two for the Time Figure of Merit (TFOM) value to fall to an
acceptable level. The current Time Figure of Merit (TFOM) value is available
in the Time Properties panel under the
b. PTP uses the TAI timescale to transfer time. Many timing references com-
municate time in the UTC timescale. UTC is offset from TAI by a small
amount which changes every time a leap second occurs. The TAI to UTC
Offset is part of the PTP Specification and must be provided to a Master
Clock. If no active reference can provide that information, the offset must
be provided by the Host. The TAI to UTC Offset can be set from the
MANAGEMENT/OTHER/Time Management
to UTC Offset).
c. The PTP protocol also provides for the transfer of Leap Second inform-
ation. If the active time reference does not provide Leap Second inform-
ation, it must be added by the user through the
MANAGEMENT/OTHER/Time Management
PTP network will have the incorrect UTC time after a leap second event.
SecureSync 2400 User Manual
Advanced tab). If not, enable it from the
page).
page).
page).
Time Figure of Merit (TFOM)
Port Status on the
Port Activity
Clock Mode
Ethernet Settings
Advanced tab on the
page (while setting the GPS
page. If this is not done, the
APPENDIX
PTP Status
of
on the
on
value of the
Status page.
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